sky-CAMERA-EXPID.fits

Summary:

This holds the sky model for a given camera and exposure.

Naming Convention:

sky-{CAMERA}-{EXPID}.fits, where {CAMERA} is one of the spectrograph cameras (e.g. z1) and {EXPID} is the 8-digit exposure ID.

Regex:

sky-[brz][0-9]-[0-9]{8}\.fits

File Type:

FITS, 17 MB

Contents

Number	EXTNAME	Type	Contents
HDU0	SKY	IMAGE	Sky model in electrons per Angstrom
HDU1	IVAR	IMAGE	Inverse variance of sky model
HDU2	MASK	IMAGE	Sky mask (0 = good)
HDU3	WAVELENGTH	IMAGE	Wavelength in Angstrom
HDU4	STATIVAR	IMAGE	Statistical-only inverse variance of sky model
HDU5	THRPUTCORR	IMAGE	Achromatic throughput correction per fiber
HDU6	THRPUTCORR_MOD	IMAGE	Model multiplicative throughput corrections for each fiber
HDU6	DWAVECOEFF	IMAGE	Vector of PCA coefficients for wavelength offsets
HDU7	DLSFCOEFF	IMAGE	Vector of PCA coefficients for LSF size changes
HDU8	SKYGRADPCACOEFF	IMAGE	Vector of gradient amplitudes for sky gradient spectra

The SKY HDU is the sky model per-fiber accounting for different fiber resolutions, but it does not include the empirical per-fiber throughput correction in the THRPUTCORR HDU. The final sky model per fiber is SKY * THRPUTCORR.

FITS Header Units

HDU0

EXTNAME = SKY

2D array of sky flux model of dimension [nspec, nwave] in units of electrons per Ansgtrom (fiber flat fielded). nspec is the number of fibers per camera. nwave in the length of the wavelength array. The spectra of all fibers share the same wavelength grid (given in HDU WAVELENGTH). The sky model is different for each fiber because it is adapted to the resolution of each fiber, it contains corrections on bright sky line, and in some cases an anisotropic component.

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	2751	int
NAXIS2	500	int
EXPID	69022	int	Exposure number
EXPFRAME	0	int	Frame number
TILEID	80616	int	DESI Tile ID
FIBASSGN	/data/tiles/SVN_tiles/080/fiberassign-080616.fits	str	Fiber assign fil
FLAVOR	science	str	Observation type
SEQUENCE	DESI	str	OCS Sequence name
PURPOSE	Commissioning	str	Purpose of observing night
PROGRAM	SV1 BGS+MWS tile 80616	str	Program name
PROPID	2019B-5000	str	Proposal ID
OBSERVER	DESIObserver	str	Names of observers
LEAD	RunManager	str	Lead observer
INSTRUME	DESI	str	Instrument name
OBSERVAT	KPNO	str	Observatory name
OBS-LAT	31.96403	str	[deg] Observatory latitude
OBS-LONG	-111.59989	str	[deg] Observatory east longitude
OBS-ELEV	2097.0	float	[m] Observatory elevation
TELESCOP	KPNO 4.0-m telescope	str	Telescope name
CORRCTOR	DESI Corrector	str	Corrector Identification
NIGHT	20201220	int	Observing night
TIMESYS	UTC	str	Time system used for date-obs
DATE-OBS	2020-12-21T02:36:32.099838	str	[UTC] Observation data and start time
TIME-OBS	02:39:11.845920	str	[UTC] Observation start time
MJD-OBS	59204.10870486	float	Modified Julian Date of observation
OPENSHUT	2020-12-21T02:36:32.099838	str	Time shutter opened
ST	01:10:39.210	str	Local Sidereal time at observation start (HH:MM
EXPTIME	300.007	float	[s] Actual exposure time
REQRA	356.0	float	[deg] Requested right ascension (observer input
REQDEC	29.0	float	[deg] Requested declination (observer input)
FOCUS	1426.5,-501.4,81.0,-2.6,42.3,169.2	str	Telescope focus settings
VCCD	ON	str	True (ON) if CCD voltage is on
VCCDON	2020-12-09T21:23:21.278481	str	Time when CCD voltage was turned on
VCCDSEC	969694.4	float	[s] CCD on time in seconds
TRUSTEMP	11.767	float	[deg] Average Telescope truss temperature (only
PMIRTEMP	8.925	float	[deg] Average primary mirror temperature (nit,e
EQUINOX	2000.0	float	Epoch of observation
MOUNTAZ	266.70224	float	[deg] Mount azimuth angle
MOUNTDEC	28.999221	float	[deg] Mount declination
MOUNTEL	71.039837	float	[deg] Mount elevation angle
MOUNTHA	21.769281	float	[deg] Mount hour angle
SKYDEC	28.999221	float	[deg] Telescope declination (pointing on sky)
SKYRA	355.996551	float	[deg] Telescope right ascension (pointing on sk
TARGTDEC	28.999221	float	[deg] Target declination (to TCS)
TARGTRA	355.996551	float	[deg] Target right ascension (to TCS)
USEETC	F	bool	ETC data available if true
USESKY	T	bool	DOS Control: use Sky Monitor
USEFOCUS	T	bool	DOS Control: use focus
HEXTRIM	0.0,0.0,0.0,0.0,0.0,0.0	str	Hexapod trim values
USEROTAT	T	bool	DOS Control: use rotator
ROTOFFST	167.1	float	[arcsec] Rotator offset
ROTENBLD	T	bool	Rotator enabled
ROTRATE	0.0	float	[arcsec/min] Rotator rate
USEGUIDR	T	bool	DOS Control: use guider
USEDONUT	T	bool	DOS Control: use donuts
SPECGRPH	6	int	Spectrograph logical name (SP)
SPECID	7	int	Spectrograph serial number (SM)
FEEBOX	lbnl075	str	CCD Controller serial number
VESSEL	22	int	Cryostat serial number
FEEVER	v20160312	str	CCD Controller version
DETFLVER [1]	FAILED: invalid argument for get command	str	CCD Controller detector f
FEEPOWER	ON	str	FEE power status
FEEDMASK	2134851391	int	FEE dac mask
FEECMASK	1048575	int	FEE clk mask
CCDTEMP	850.0	float	[deg C] CCD controller CCD temperature
RADESYS	FK5	str	Coordinate reference frame of major/minor axes
FILENAME	/exposures/desi/specs/20201220/00069022/sp1-00069022.fits.fz	str	Name
DOSVER	trunk	str	DOS software version
OCSVER	1.2	float	OCS software version
CONSTVER	DESI:CURRENT	str	Constants version
INIFILE	/data/msdos/dos_home/architectures/kpno/desi.ini	str	DOS Configuration
DELAYS	13, 13, 25, 25, 8, 3000, 7, 7, 7, 7	str	[10] Delay settings
CCDPREP	purge,clear	str	CCD prep actions
DETSECA	[1:2048, 1:2048]	str	Detector section for quadrant A
CDSPARMS	350, 350, 8, 1000	str	CDS parameters
CRYOTEMP [1]	162.97	float	[deg K] Cryostat CCD temperature
CLOCK15	0.0,0.0	str	[V] high rail, low rail
CLOCK11	0.0,0.0	str	[V] high rail, low rail
ORSECA	[5:2052, 2050:2081]	str	Row overscan section for quadrant A
CASETEMP	51.9392	float	[deg C] CCD controller case temperature
AMPSECC	[2048:1, 2049:4096]	str	AMP section for quadrant C
CLOCK4	3.9999,-4.0002	str	[V] high rail, low rail
CLOCK17	3.9999,-4.0002	str	[V] high rail, low rail
DAC13	0.0,-5.0544	str	[V] set value, measured value
DAC2	15.9998,15.9032	str	[V] set value, measured value
DATASECA	[5:2052, 2:2049]	str	Data section for quadrant A
DATASECB	[2181:4228, 2:2049]	str	Data section for quadrant B
PRESECB	[4229:4232, 2:2049]	str	Prescan section for quadrant B
DAC14	0.0,0.8008	str	[V] set value, measured value
ORSECD	[2181:4228, 2082:2113]	str	Row bias section for quadrant D
CCDSIZE	4162,4232	str	CCD size in pixels (rows, columns)
SETTINGS	detectors_sm_20191211.json	str	Name of DESI CCD settings file
PRESECA	[1:4, 2:2049]	str	Prescan section for quadrant A
CLOCK14	3.0,-8.0001	str	[V] high rail, low rail
DAC16	0.0,64.1256	str	[V] set value, measured value
CCDNAME	CCDSM7B	str	CCD name
AMPSECD	[4096:2049, 4096:2049]	str	AMP section for quadrant D
PRRSECC	[5:2052, 4162:4162]	str	Row prescan section for quadrant C
CCDCFG	sn22813_sta_20190405.cfg	str	CCD configuration file
DAC8	26.9998,26.0294	str	[V] set value, measured value
BIASSECD	[2117:2180, 2114:4161]	str	Bias section for quadrant D
PRESECC	[1:4, 2114:4161]	str	Prescan section for quadrant C
CCDSECD	[2049:4096, 2049:4096]	str	CCD section for quadrant D
CLOCK8	3.0,-8.0001	str	[V] high rail, low rail
TRIMSECA	[5:2052, 2:2049]	str	Trim section for quadrant A
DAC5	0.0,0.0	str	[V] set value, measured value
BIASSECC	[2053:2116, 2114:4161]	str	Bias section for quadrant C
OFFSET0	-1.5,15.8311	str	[V] set value, measured value
CLOCK18	3.9999,-4.0002	str	[V] high rail, low rail
CCDTMING	default_sta_timing_20180905.txt	str	CCD timing file
TRIMSECD	[2181:4228, 2114:4161]	str	Trim section for quadrant D
OFFSET1	-1.5,15.8208	str	[V] set value, measured value
OFFSET4	-1.100000023841858,0.0105	str	[V] set value, measured value
DATASECD	[2181:4228, 2114:4161]	str	Data section for quadrant D
CLOCK3	6.9999,-2.0001	str	[V] high rail, low rail
PGAGAIN	5	int	Controller gain
PRRSECA	[5:2052, 1:1]	str	Row prescan section for quadrant A
CLOCK12	3.0,-8.0001	str	[V] high rail, low rail
CLOCK6	3.9999,-4.0002	str	[V] high rail, low rail
OFFSET5	-1.100000023841858,-0.0053	str	[V] set value, measured value
CLOCK2	3.9999,-4.0002	str	[V] high rail, low rail
CLOCK16	0.0,0.0	str	[V] high rail, low rail
ORSECB	[2181:4228, 2050:2081]	str	Row overscan section for quadrant B
DAC12	0.0,5.0232	str	[V] set value, measured value
DETSECC	[1:2048, 2049:4096]	str	Detector section for quadrant C
DAC15	19.9997,19.6768	str	[V] set value, measured value
CAMERA	b6	str	Camera name
DAC6	0.0,0.0053	str	[V] set value, measured value
BIASSECB	[2117:2180, 2:2049]	str	Bias section for quadrant B
DAC4	0.0,0.0105	str	[V] set value, measured value
CLOCK1	3.9999,-4.0002	str	[V] high rail, low rail
PRRSECD	[2181:4228, 4162:4162]	str	Row prescan section for quadrant D
DAC7	0.0,0.0	str	[V] set value, measured value
DETSECD	[2049:4096, 2049:4096]	str	Detector section for quadrant D
ORSECC	[5:2052, 2082:2113]	str	Row overscan section for quadrant C
DAC17	-0.0,0.0488	str	[V] set value, measured value
CRYOPRES [1]	9.252e-08	str	[mb] Cryostat pressure (IP)
AMPSECA	[1:2048, 1:2048]	str	AMP section for quadrant A
CLOCK5	3.9999,-4.0002	str	[V] high rail, low rail
CCDSECA	[1:2048, 1:2048]	str	CCD section for quadrant A
DAC9	26.9998,26.252	str	[V] set value, measured value
CLOCK0	3.9999,-4.0002	str	[V] high rail, low rail
DETSECB	[2049:4096, 1:2048]	str	Detector section for quadrant B
DAC1	15.9998,15.8311	str	[V] set value, measured value
DAC3	15.9998,15.8517	str	[V] set value, measured value
DAC11	26.9998,26.9198	str	[V] set value, measured value
CLOCK9	3.0,-8.0001	str	[V] high rail, low rail
DIGITIME	41.6984	float	[s] Time to digitize image
OFFSET2	-1.5,15.9135	str	[V] set value, measured value
PRESECD	[4229:4232, 2114:4161]	str	Prescan section for quadrant D
CLOCK10	3.0,-8.0001	str	[V] high rail, low rail
DAC0	15.9998,15.8311	str	[V] set value, measured value
TRIMSECB	[2181:4228, 2:2049]	str	Trim section for quadrant B
OFFSET3	-1.5,15.8414	str	[V] set value, measured value
AMPSECB	[2049:4096, 2048:1]	str	AMP section for quadrant B
CPUTEMP	51.334	float	[deg C] CCD controller CPU temperature
CCDSECC	[1:2048, 2049:4096]	str	CCD section for quadrant C
OFFSET7	-1.100000023841858,0.0	str	[V] set value, measured value
BLDTIME	0.3499	float	[s] Time to build image
DATASECC	[5:2052, 2114:4161]	str	Data section for quadrant C
DETECTOR	sn22813	str	Detector (ccd) identification
OFFSET6	-1.100000023841858,0.0053	str	[V] set value, measured value
BIASSECA	[2053:2116, 2:2049]	str	Bias section for quadrant A
TRIMSECC	[5:2052, 2114:4161]	str	Trim section for quadrant C
PRRSECB	[2181:4228, 1:1]	str	Row prescan section for quadrant B
CCDSECB	[2049:4096, 1:2048]	str	CCD section for quadrant B
DAC10	26.9998,26.9198	str	[V] set value, measured value
CLOCK13	3.0,-8.0001	str	[V] high rail, low rail
CLOCK7	6.9999,-2.0001	str	[V] high rail, low rail
REQTIME	300.0	float	[s] Requested exposure time
OBSID	kp4m20201221t023911	str	Unique observation identifier
PROCTYPE	RAW	str	Data processing level
PRODTYPE	image	str	Data product type
CHECKSUM	VAChW8AfVAAfV7Af	str	HDU checksum updated 2022-02-14T06:13:54
DATASUM	1301167967	str	data unit checksum updated 2022-02-14T06:13:54
GAINA	1.29	float	e/ADU (gain applied to image)
SATULEVA	40000.0	float	saturation or non lin. level, in ADU, inc. bias
OSTEPA	1.21893160851323	float	ADUs (max-min of median overscan per row)
OMETHA	AVERAGE	str	use average overscan
OVERSCNA	1201.407080585313	float	ADUs (gain not applied)
OBSRDNA	3.932320693814749	float	electrons (gain is applied)
SATUELEA	50050.18486604495	float	saturation or non lin. level, in electrons
GAINB	1.284	float	e/ADU (gain applied to image)
SATULEVB	65535.0	float	saturation or non lin. level, in ADU, inc. bias
OSTEPB	0.9970038118117373	float	ADUs (max-min of median overscan per row)
OMETHB	AVERAGE	str	use average overscan
OVERSCNB	1212.197611701435	float	ADUs (gain not applied)
OBSRDNB	3.323361580066672	float	electrons (gain is applied)
SATUELEB	82590.47826657536	float	saturation or non lin. level, in electrons
GAINC	1.292	float	e/ADU (gain applied to image)
SATULEVC	40000.0	float	saturation or non lin. level, in ADU, inc. bias
OSTEPC	0.7691677607072052	float	ADUs (max-min of median overscan per row)
OMETHC	AVERAGE	str	use average overscan
OVERSCNC	1178.422505897216	float	ADUs (gain not applied)
OBSRDNC	3.252427649816138	float	electrons (gain is applied)
SATUELEC	50157.4781223808	float	saturation or non lin. level, in electrons
GAIND	1.295	float	e/ADU (gain applied to image)
SATULEVD	44000.0	float	saturation or non lin. level, in ADU, inc. bias
OSTEPD	0.9395222094608471	float	ADUs (max-min of median overscan per row)
OMETHD	AVERAGE	str	use average overscan
OVERSCND	1174.800960708566	float	ADUs (gain not applied)
OBSRDND	3.333804957383686	float	electrons (gain is applied)
SATUELED	55458.6327558824	float	saturation or non lin. level, in electrons
FIBERMIN	3000	int
BBKGMINA [1]	-0.2077800596230136	float
BBKGMAXA [1]	0.5254324469128164	float
BBKGMINB [1]	-0.2033242713025349	float
BBKGMAXB [1]	0.4258502359052168	float
BBKGMINC [1]	-0.1314577356495719	float
BBKGMAXC [1]	0.4236035445727393	float
BBKGMIND [1]	-0.2582211042496522	float
BBKGMAXD [1]	0.3659635169905933	float
LONGSTRN	OGIP 1.0	str	The OGIP Long String Convention may be used.
MODULE	CI	str	Image Sources/Component
COSMSPLT	F	bool	Cosmics split exposure if true
MAXSPLIT	0	int	Number of allowed exposure splits
SPLITIDS [1]	69022	str	List of expids for split exposures
OBSTYPE	SCIENCE	str	Spectrograph observation type
MANIFEST	F	bool	DOS exposure manifest
OBJECT		str	Object name
SEQNUM	1	int	Number of exposure in sequence
CAMSHUT	open	str	Shutter status during observation
ACQTIME	15.0	float	[s] acqusition image exposure time
GUIDTIME	5.0	float	[s] guider GFA exposure time
FOCSTIME [1]	60.0	float	[s] focus GFA exposure time
SKYTIME [1]	60.0	float	[s] sky camera exposure time (acquisition)
WHITESPT	F	bool	Telescope is at whitespot
ZENITH	F	bool	Telescope is at zenith
SEANNEX	F	bool	Telescope is at SE annex
BEYONDP	F	bool	Telescope is beyond pole
FIDUCIAL	off	str	Fiducials status during observation
BACKLIT	off	str	Fibers are backlit if True
AIRMASS	1.060311	float	Airmass
PMREADY	T	bool	Primary mirror ready
PMCOVER	open	str	Primary mirror cover
PMCOOL	off	str	Primary mirror cooling
DOMSHUTU	open	str	Upper dome shutter
DOMSHUTL	open	str	Lower dome shutter
DOMLIGHH	off	str	High dome lights
DOMLIGHL	off	str	Low dome lights
DOMEAZ	255.166	float	[deg] Dome azimuth angle
DOMINPOS	T	bool	Dome is in position
GUIDOFFR	-0.052283	float	[arcsec] Cummulative guider offset (RA)
GUIDOFFD	0.136634	float	[arcsec] Cummulative guider offset (dec)
MOONDEC	-8.975162	float	[deg] Moon declination at start of exposure
MOONRA	352.538429	float	[deg] Moon RA at start of exposure
INCTRL	T	bool	DESI in control
INPOS	T	bool	Mount in position
MNTOFFD	-15.76	float	[arcsec] Mount offset (dec)
MNTOFFR	29.32	float	[arcsec] Mount offset (RA)
PARALLAC	75.635085	float	[deg] Parallactic angle
TARGTAZ	267.074049	float	[deg] Target azimuth
TARGTEL	70.563787	float	[deg] Target elevation
TRGTOFFD	0.0	float	[arcsec] Telescope target offset (dec)
TRGTOFFR	0.0	float	[arcsec] Telescope target offset (RA)
ZD	19.436213	float	[deg] Telescope zenith distance
TILERA	356.0	float	RA of tile given in fiberassign file
TILEDEC	29.0	float	DEC of tile given in fiberassign file
TCSST	01:13:18.668	str	Local Sidereal time reported by TCS (HH:MM:SS)
TCSMJD	59204.110981	float	MJD reported by TCS
USETURB [1]	T	bool	Turbulence corrections are applied if true
ACQCAM	GUIDE0,GUIDE2,GUIDE3,GUIDE5,GUIDE7,GUIDE8	str	Acquisition cameras used
GUIDECAM	GUIDE0,GUIDE2,GUIDE3,GUIDE5,GUIDE7,GUIDE8	str	Guide cameras used for t
FOCUSCAM [1]	FOCUS1,FOCUS4,FOCUS6,FOCUS9	str	Focus cameras used for this exposure
SKYCAM [1]	SKYCAM0,SKYCAM1	str	Sky cameras used for this exposure
REQADC	65.78,85.28	str	[deg] requested ADC angles
ADCCORR	T	bool	Correct pointing for ADC setting if True
ADC1PHI	65.780005	float	[deg] ADC 1 angle
ADC2PHI	85.279991	float	[deg] ADC 2 angle
ADC1HOME	F	bool	ADC 1 at home position if True
ADC2HOME	F	bool	ADC 2 at home position if True
ADC1NREV	-1.0	float	ADC 1 number of revs
ADC2NREV	0.0	float	ADC 2 number of revs
ADC1STAT	STOPPED	str	ADC 1 status
ADC2STAT	STOPPED	str	ADC 2 status
HEXPOS	1426.5,-501.3,81.0,-2.6,42.3,171.9	str	Hexapod position
RESETROT	F	bool	DOS Control: reset hex rotator
USEPOS	T	bool	Fiber positioner data available if true
PETALS	PETAL0,PETAL1,PETAL2,PETAL3,PETAL4,PETAL5,PETAL6,PETAL7,PETAL8,PETAL9	str	Participating petals
POSCYCLE	1	int	Number of current iteration
POSONTGT	3626	int	Number of positioners on target
POSNOTON [1]	6	int	Number of enabled positioners not on target
POSONFRC	0.8613	float	Fraction of positioners on target
POSDISAB	37	int	Number of disabled positioners
POSENABL	4210	int	Number of enabled positioners
POSRMS	0.0171	float	[mm] RMS of positioner accuracy
TURBRMS [1]	0.0071	float	[mm] RMS of turbulence correction
POSITER	1	int	Positioning Control: max. number of pos. cycles
POSFRACT	0.95	float
POSTOLER	0.01	float	Positioning Control: in_position tolerance (mm)
POSMVALL	T	bool	Positioning Control: move all positioners
GUIDMODE	catalog	str	Guider mode
USEAOS [1]	F	bool	DOS Control: AOS data available if true
USESPCTR	T	bool	DOS Control: use spectrographs
SPCGRPHS	SP0,SP1,SP2,SP3,SP4,SP5,SP6,SP7,SP8,SP9	str	Participating spectrograph
ILLSPECS [1]	SP0,SP1,SP2,SP3,SP4,SP5,SP6,SP7,SP8,SP9	str	Participating illuminate s
CCDSPECS [1]	SP0,SP1,SP2,SP3,SP4,SP5,SP6,SP7,SP8,SP9	str	Participating ccd spectrog
TDEWPNT	-16.043	float	Telescope air dew point
TAIRFLOW	0.0	float	Telescope air flow
TAIRITMP	11.8	float	[deg] Telescope air in temperature
TAIROTMP	11.7	float	[deg] Telescope air out temperature
TAIRTEMP	10.65	float	[deg] Telescope air temperature
TCASITMP	0.0	float	[deg] Telescope Cass Cage in temperature
TCASOTMP	10.8	float	[deg] Telescope Cass Cage out temperature
TCSITEMP	9.3	float	[deg] Telescope center section in temperature
TCSOTEMP	10.8	float	[deg] Telescope center section out temperature
TCIBTEMP	0.0	float	[deg] Telescope chimney IB temperature
TCIMTEMP	0.0	float	[deg] Telescope chimney IM temperature
TCITTEMP	0.0	float	[deg] Telescope chimney IT temperature
TCOSTEMP	0.0	float	[deg] Telescope chimney OS temperature
TCOWTEMP	0.0	float	[deg] Telescope chimney OW temperature
TDBTEMP	9.3	float	[deg] Telescope dec bore temperature
TFLOWIN	0.0	float	Telescope flow rate in
TFLOWOUT	0.0	float	Telescope flow rate out
TGLYCOLI	9.9	float	[deg] Telescope glycol in temperature
TGLYCOLO	9.8	float	[deg] Telescope glycol out temperature
THINGES	11.4	float	[deg] Telescope hinge S temperature
THINGEW	11.2	float	[deg] Telescope hinge W temperature
TPMAVERT	8.931	float	[deg] Telescope mirror averagetemperature
TPMDESIT	7.0	float	[deg] Telescope mirror desired temperature
TPMEIBT	8.6	float	[deg] Telescope mirror EIB temperature
TPMEITT	8.6	float	[deg] Telescope mirror EIT temperature
TPMEOBT	8.5	float	[deg] Telescope mirror EOB temperature
TPMEOTT	9.0	float	[deg] Telescope mirror EOT temperature
TPMNIBT	8.4	float	[deg] Telescope mirror NIB temperature
TPMNITT	8.9	float	[deg] Telescope mirror NIT temperature
TPMNOBT	8.8	float	[deg] Telescope mirror NOB temperature
TPMNOTT	9.1	float	[deg] Telescope mirror NOT temperature
TPMRTDT	9.0	float	[deg] Telescope mirror RTD temperature
TPMSIBT	8.6	float	[deg] Telescope mirror SIB temperature
TPMSITT	8.8	float	[deg] Telescope mirror SIT temperature
TPMSOBT	8.2	float	[deg] Telescope mirror SOB temperature
TPMSOTT	8.9	float	[deg] Telescope mirror SOT temperature
TPMSTAT	ready	str	Telescope mirror status
TPMWIBT	8.2	float	[deg] Telescope mirror WIB temperature
TPMWITT	9.1	float	[deg] Telescope mirror WIT temperature
TPMWOBT	8.3	float	[deg] Telescope mirror WOB temperature
TPMWOTT	8.9	float	[deg] Telescope mirror WOT temperature
TPCITEMP	8.5	float	[deg] Telescope primary cell in temperature
TPCOTEMP	8.6	float	[deg] Telescope primary cell out temperature
TPR1HUM	0.0	float	Telescope probe 1 humidity
TPR1TEMP	0.0	float	[deg] Telescope probe1 temperature
TPR2HUM	0.0	float	Telescope probe 2 humidity
TPR2TEMP	0.0	float	[deg] Telescope probe2 temperature
TSERVO	40.0	float	Telescope servo setpoint
TTRSTEMP	11.4	float	[deg] Telescope top ring S temperature
TTRWTEMP	11.0	float	[deg] Telescope top ring W temperature
TTRUETBT	-4.2	float	[deg] Telescope truss ETB temperature
TTRUETTT	11.2	float	[deg] Telescope truss ETT temperature
TTRUNTBT	10.9	float	[deg] Telescope truss NTB temperature
TTRUNTTT	11.2	float	[deg] Telescope truss NTT temperature
TTRUSTBT	10.7	float	[deg] Telescope truss STB temperature
TTRUSTST	10.8	float	[deg] Telescope truss STS temperature
TTRUSTTT	11.1	float	[deg] Telescope truss STT temperature
TTRUTSBT	11.8	float	[deg] Telescope truss TSB temperature
TTRUTSMT	11.8	float	[deg] Telescope truss TSM temperature
TTRUTSTT	11.8	float	[deg] Telescope truss TST temperature
TTRUWTBT	10.5	float	[deg] Telescope truss WTB temperature
TTRUWTTT	10.9	float	[deg] Telescope truss WTT temperature
ALARM	F	bool	UPS major alarm or check battery
ALARM-ON	F	bool	UPS active alarm condition
BATTERY	100.0	float	[%] UPS Battery left
SECLEFT	5178.0	float	[s] UPS Seconds left
UPSSTAT [1]	System Normal - On Line(7)	str	UPS Status
INAMPS	70.4	float	[A] UPS total input current
OUTWATTS	5000.0,7200.0,4800.0	str	[W] UPS Phase A, B, C output watts
COMPDEW	-12.9	float	[deg C] Computer room dewpoint
COMPHUM	7.4	float	[%] Computer room humidity
COMPAMB	19.5	float	[deg C] Computer room ambient temperature
COMPTEMP	24.5	float	[deg C] Computer room hygrometer temperature
DEWPOINT	11.5	float	[deg C] (outside) dewpoint
HUMIDITY	10.0	float	[%] (outside) humidity
PRESSURE	795.0	float	[torr] (outside) air pressure
OUTTEMP	0.0	float	[deg C] outside temperature
WINDDIR	55.0	float	[deg] wind direction
WINDSPD	27.3	float	[m/s] wind speed
GUST	20.6	float	[m/s] Wind gusts speed
AMNIENTN	13.5	float	[deg C] ambient temperature north
CFLOOR	8.9	float	[deg C] temperature on C floor
NWALLIN	13.9	float	[deg C] temperature at north wall inside
NWALLOUT	9.6	float	[deg C] temperature at north wall outside
WWALLIN	12.9	float	[deg C] temperature at west wall inside
WWALLOUT	10.6	float	[deg C] temperature at west wall outside
AMBIENTS	14.8	float	[deg C] ambient temperature south
FLOOR	12.6	float	[deg C] temperature at floor (LCR)
EWALLCMP	10.8	float	[deg C] temperature at east wall, computer room
EWALLCOU	10.6	float	[deg C] temperature at east wall, Coude room
ROOF	10.3	float	[deg C] temperature on roof
ROOFAMB	10.6	float	[deg C] ambient temperature on roof
DOMEBLOW	10.4	float	[deg C] temperature at dome back, lower
DOMEBUP	10.7	float	[deg C] temperature at dome back, upper
DOMELLOW	10.8	float	[deg C] temperature at dome left, lower
DOMELUP	10.8	float	[deg C] temperature at dome left, upper
DOMERLOW	10.6	float	[deg C] temperature at dome right, lower
DOMERUP	10.5	float	[deg C] temperature at dome right, upper
PLATFORM	10.4	float	[deg C] temperature at platform
SHACKC	14.4	float	[deg C] temperature at shack ceiling
SHACKW	13.7	float	[deg C] temperature at shack wall
STAIRSL	10.5	float	[deg C] temperature at stairs, lower
STAIRSM	10.4	float	[deg C] temperature at stairs, mid
STAIRSU	10.6	float	[deg C] temperature at stairs, upper
TELBASE	9.6	float	[deg C] temperature at telescope base
UTILWALL	11.1	float	[deg C] temperature at utility room wall
UTILROOM	10.9	float	[deg C] temperature in utilitiy room
TNFSPROC [1]	8.1963	float	[s] PlateMaker NFSPROC processing time
TGFAPROC [1]	7.9212	float	[s] PlateMaker GFAPROC processing time
SIMGFAP	F	bool	DOS Control: simulate GFAPROC
USEFVC	T	bool	DOS Control: use fvc
USEFID	T	bool	DOS Control: use fiducials
USEILLUM	T	bool	DOS Control: use illuminator
USEXSRVR	T	bool	DOS Control: use exposure server
USEOPENL	T	bool	DOS Control: use open loop move
USEMIDPT [1]	T	bool	Use exposure midpoint if true
STOPGUDR	T	bool	DOS Control: stop guider
STOPFOCS	T	bool	DOS Control: stop focus
STOPSKY	T	bool	DOS Control: stop sky monitor
KEEPGUDR	F	bool	DOS Control: keep guider running
KEEPFOCS	F	bool	DOS Control: keep focus running
KEEPSKY	F	bool	DOS Control: keep sky mon. running
REACQUIR	F	bool	DOS Control: reacquire same files
EXCLUDED		str	Components excluded from this exposure
PMVER [1]	desi-138368	str	PlateMaker/Dervish version
FVCTIME [1]	2.0	float	[s] FVC exposure time
SIMGFACQ	F	bool
POSCNVGD [1]	F	bool	Number of positioners converged
GUIEXPID	69022	int	Guider exposure id at start of spectro exp.
IGFRMNUM	12	int	Guider frame number at start of spectro exp.
FOCEXPID	69022	int	Focus exposure id at start of spectro exp.
IFFRMNUM	1	int	Focus frame number at start of spectro exp.
TMEBTEXP [1]	1219.825	float	[s] Time between (DESI) exposures
SKYEXPID	69022	int	Sky exposure id at start of spectro exp.
ISFRMNUM	1	int	Sky frame number at start of spectro exp.
FGFRMNUM	46	int	Guider frame number at end of spectro exp.
FFFRMNUM	6	int	Focus frame number at end of spectro exp.
FSFRMNUM	5	int	Sky frame number at end of spectro exp.
ETCSKYLV [1]	15.1381	float	[unit?] ETC skylevel
HELIOCOR	0.9999115198216216	float
NSPEC	500	int	Number of spectra
WAVEMIN	3600.0	float	First wavelength [Angstroms]
WAVEMAX	5800.0	float	Last wavelength [Angstroms]
WAVESTEP	0.8	float	Wavelength step size [Angstroms]
SPECTER	0.10.0	str	https://github.com/desihub/specter
IN_PSF	SPECPROD/exposures/20201220/00069022/psf-b6-00069022.fits	str	Input sp
IN_IMG	SPECPROD/preproc/20201220/00069022/preproc-b6-00069022.fits	str
ORIG_PSF	SPECPROD/calibnight/20201220/psfnight-b6-20201220.fits	str
BUNIT	electron/Angstrom	str
IN_FRAME	SPECPROD/exposures/20201220/00069022/frame-b6-00069022.fits	str
FIBERFLT	SPECPROD/exposures/20201220/00069022/fiberflatexp-b6-00069022.fits	str
SP1NIRT [1]	139.91	float	[K] SP1 NIR temperature
SP4NIRT [1]	139.96	float	[K] SP4 NIR temperature
PMTRANS [1]	96.38	float	[%] PlateMaker GFAPROC transparency
SUNRA [1]	16.188197	float	[deg] Sun RA at start of exposure
SP3REDT [1]	139.96	float	[K] SP3 red temperature
SP2NIRP [1]	5.108e-08	float	[mb] SP2 NIR pressure
SP6NIRP [1]	2.875e-07	float	[mb] SP6 NIR pressure
SP8REDP [1]	6.99e-08	float	[mb] SP8 red pressure
SP4REDP [1]	4.945e-08	float	[mb] SP4 red pressure
SP0NIRP [1]	5.598e-08	float	[mb] SP0 NIR pressure
SP1REDP [1]	5.142e-08	float	[mb] SP1 red pressure
SP5NIRT [1]	139.94	float	[K] SP5 NIR temperature
SP8BLUP [1]	8.113e-08	float	[mb] SP8 blue pressure
SP1REDT [1]	139.89	float	[K] SP1 red temperature
SP3NIRT [1]	140.01	float	[K] SP3 NIR temperature
SP6BLUP [1]	7.209e-08	float	[mb] SP6 blue pressure
SP9BLUP [1]	1.181e-07	float	[mb] SP9 blue pressure
SP2REDP [1]	8.846e-08	float	[mb] SP2 red pressure
USESPLIT [1]	T	bool	Exposure splits are allowed
SP7REDT [1]	139.99	float	[K] SP7 red temperature
SP9NIRT [1]	139.89	float	[K] SP9 NIR temperature
SP0REDP [1]	4.896e-08	float	[mb] SP0 red pressure
SP7NIRP [1]	4.315e-08	float	[mb] SP7 NIR pressure
SP2REDT [1]	139.99	float	[K] SP2 red temperature
SP7REDP [1]	5.383e-08	float	[mb] SP7 red pressure
SP6NIRT [1]	139.89	float	[K] SP6 NIR temperature
SP6REDP [1]	5.397e-08	float	[mb] SP6 red pressure
SP8REDT [1]	139.94	float	[K] SP8 red temperature
FRAMES [1]	None	Unknown	Number of Frames in Archive
SP9REDT [1]	140.01	float	[K] SP9 red temperature
SP2NIRT [1]	139.91	float	[K] SP2 NIR temperature
SP4BLUP [1]	4.978e-08	float	[mb] SP4 blue pressure
SP8NIRP [1]	4.945e-08	float	[mb] SP8 NIR pressure
SPLITEXP [1]	F	bool	Split exposure part of a visit
SEQSTART [1]	2021-04-07T03:54:14.413292	str	Start time of sequence processing
STARTADJ [1]	2022-03-18T03:57:35.888348	str	Time sequence starts adjusting the inst
SP8NIRT [1]	139.99	float	[K] SP8 NIR temperature
SP7BLUT [1]	163.02	float	[K] SP7 blue temperature
SP5REDP [1]	4.693e-08	float	[mb] SP5 red pressure
SP5NIRP [1]	7.197e-08	float	[mb] SP5 NIR pressure
SP5BLUT [1]	163.02	float	[K] SP5 blue temperature
SP0BLUP [1]	9.122e-08	float	[mb] SP0 blue pressure
SP1NIRP [1]	4.585e-08	float	[mb] SP1 NIR pressure
TCSKDEC [1]	0.3 0.003 0.00003	str	TCS Kalman (dec)
SP6REDT [1]	139.94	float	[K] SP6 red temperature
TCSPIDEC [1]	1.0,0.0,0.0,0.0	str	TCS PI settings (P, I (gain, error window, satu
TCSGRA [1]	0.3	float	TCS simple gain (RA)
TCSGDEC [1]	0.3	float	TCS simple gain (dec)
SP1BLUT [1]	163.02	float	[K] SP1 blue temperature
SP9NIRP [1]	5.207e-08	float	[mb] SP9 NIR pressure
SP0NIRT [1]	139.89	float	[K] SP0 NIR temperature
SP4BLUT [1]	163.02	float	[K] SP4 blue temperature
SP9BLUT [1]	163.02	float	[K] SP9 blue temperature
SP9REDP [1]	4.884e-08	float	[mb] SP9 red pressure
PMSEEING [1]	1.19	float	[arcsec] PlateMaker GFAPROC seeing
SP0REDT [1]	139.96	float	[K] SP0 red temperature
SP2BLUT [1]	163.02	float	[K] SP2 blue temperature
TCSKRA [1]	0.3 0.003 0.00003	str	TCS Kalman (RA)
SP3NIRP [1]	4.194e-08	float	[mb] SP3 NIR pressure
TCSPIRA [1]	1.0,0.0,0.0,0.0	str	TCS PI settings (P, I (gain, error window, satu
SP8BLUT [1]	162.9	float	[K] SP8 blue temperature
VISITIDS [1]	83717	str	List of expids for a visit (same tile)
MOONSEP [1]	138.187	float	[deg] Moon Separation
SP5BLUP [1]	1.125e-07	float	[mb] SP5 blue pressure
TCSMFDEC [1]	1	int	TCS moving filter length (dec)
SP4NIRP [1]	6.595e-08	float	[mb] SP4 NIR pressure
SP7BLUP [1]	9.98e-08	float	[mb] SP7 blue pressure
SP2BLUP [1]	6.432e-08	float	[mb] SP2 blue pressure
SUNDEC [1]	6.890581	float	[deg] Sun declination at start of exposure
SP1BLUP [1]	8.039e-08	float	[mb] SP1 blue pressure
SKYLEVEL [1]	1.398	float	[counts?] ETC sky level
TCSMFRA [1]	1	int	TCS moving filter length (RA)
SP3BLUP [1]	8.133e-08	float	[mb] SP3 blue pressure
SP5REDT [1]	139.99	float	[K] SP5 red temperature
SP7NIRT [1]	139.96	float	[K] SP7 NIR temperature
SP0BLUT [1]	163.02	float	[K] SP0 blue temperature
SP3REDP [1]	6.033e-08	float	[mb] SP3 red pressure
NTSSURVY [1]	sv3	str	NTS survey name
SP3BLUT [1]	163.04	float	[K] SP3 blue temperature
SP4REDT [1]	140.01	float	[K] SP4 red temperature
SP6BLUT [1]	163.02	float	[K] SP6 blue temperature
SEQID [1]	6 requests	str	Exposure sequence identifier
SEQTOT [1]	6	int	Total number of exposures in sequence
MINTIME [1]	120.0	float	[s] Minimum exposure time (from NTS, used by ET
MIDTIME [1]	840.2095	float	[s] Exposure midpoint time used by PlateMaker
SEEING [1]	None	float	[arcsec] ETC/PM seeing
ETCTEFF [1]	226.882385	float	[s] ETC effective exposure time
ETCPREV [1]	0.0	float	[s] ETC cummulative t_eff for visit
ETCSPLIT [1]	1	int	ETC split sequence number for this visit
TOTTEFF [1]	225.6017	float	[s] Total effective exposure time for visit
TRANSPAR [1]	None	float	ETC/PM transparency
ACQFWHM [1]	0.890634	float	[arcsec] FWHM of guide star PSF in acquisition
POSCVFRC [1]	0.4956	float	Fraction of converged positioners
ETCTRANS [1]	0.915827	float	ETC averaged TRANSP normalized to 1
SLEWANGL [1]	16.255	float	[deg] Slew Angle
SLEWTIME [1]	123.315	float	[s] Slew Time
SBPROF [1]	BGS	str	Profile used by ETC
ETCREAL [1]	392.495819	float	[s] ETC real open shutter time
ETCTHRUB [1]	0.964227	float	ETC averaged thruput (BGS profile)
ETCFRACE [1]	0.45002	float	ETC transparency weighted average of FFRAC (ELG
ETCPROF [1]	BGS	str	ETC source brightness profile
ACTTEFF [1]	226.882385	float	[s] Actual effective exposure time
ESTTIME [1]	366.345	float	[s] Estimated exposure time for visit (from ETC
ETCTHRUP [1]	1.034724	float	ETC averaged thruput (PSF profile)
PMTRANSP [1]	98.17	float	[%] PlateMaker GFAPROC transparency
ETCFRACP [1]	0.634939	float	ETC transparency weighted average of FFRAC (PSF
ETCVERS [1]	0.1.12-3-g12b54bb	str	ETC version
ETCFRACB [1]	0.199883	float	ETC transparency weighted average of FFRAC (BGS
MAXTIME [1]	5400.0	float	[s] Maximum exposure time for entire visit (fro
NTSPROG [1]	BRIGHT	str	NTS program name
CONVERGD [1]	F	bool	Positioning loop converged (CNFRC>0.95)
ETCTHRUE [1]	0.999856	float	ETC averaged thruput (ELG profile)
ETCSKY [1]	1.924707	float	ETC averaged, normalized sky camera flux
ETCSEENG [1]	0.8906	float	[arcsec] ETC seeing
REQTEFF [1]	220.0	float	[s] Requested effective exposure time
USESPLITS [1]	T	bool	Exposure splits are allowed
UPSSTAT [1]	17826.0	float	UPS Status

[1] (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148)

Optional

Data: FITS image [float32, 2326x500]

HDU1

EXTNAME = IVAR

Inverse variance of sky model in units of (electrons per Ansgtrom)^-2.

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	2326	int
NAXIS2	500	int
CHECKSUM	WMCiXJ9ZWJCfWJ9Z	str	HDU checksum updated 2021-07-08T02:23:26
DATASUM	3732109365	str	data unit checksum updated 2021-07-08T02:23:26

Data: FITS image [float32, 2326x500]

HDU2

EXTNAME = MASK

Sky mask; 0=good. See the bitmask documentation page for the definition of the bits. Prior to desispec/0.24.0 and software release 18.9, the MASK HDU was compressed.

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	2326	int
NAXIS2	500	int
BSCALE	1	int
BZERO	2147483648	int
CHECKSUM	kIf3lGc0kGc0kGc0	str	HDU checksum updated 2021-07-08T02:23:26
DATASUM	581500	str	data unit checksum updated 2021-07-08T02:23:26

Data: FITS image [int32, 2326x500]

HDU3

EXTNAME = WAVELENGTH

1D array of wavelengths, in Angstrom. Note the wavelength is in the solar system barycenter frame, so that the sky flux array can be directly subtracted to the flat-fielded frame fluxes which are on the same wavelength grid. In order to compare the sky spectrum of different exposures, or with litterature data, one has to convert back the wavelength array to the observer frame, by dividing it by Doppler factor saved in header keyword HELIOCOR in HDU0. See also the frame WAVELENGTH documentation for more details.

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	2326	int
BUNIT	Angstrom	str	Wavelength units
CHECKSUM	7BAoAA3l7A9lAA9l	str	HDU checksum updated 2021-07-08T02:23:26
DATASUM	1502044794	str	data unit checksum updated 2021-07-08T02:23:26

Data: FITS image [float32, 2326]

HDU4

EXTNAME = STATIVAR

Statistical-only inverse variance of sky model.

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	2326	int
NAXIS2	500	int
CHECKSUM	SAMkT5JjSAJjS3Jj	str	HDU checksum updated 2021-07-08T02:23:27
DATASUM	3877575180	str	data unit checksum updated 2021-07-08T02:23:27

Data: FITS image [float32, 2326x500]

HDU5

EXTNAME = THRPUTCORR

Multiplicative achromatic throughput correction per fiber. This term has been measured on the bright sky lines of each fiber from the exposure (EXPID). It is used as a correction to the mean sky model.

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	500	int
CHECKSUM	VPA5WO62VOA2VO52	str	HDU checksum updated 2021-07-08T02:23:27
DATASUM	63793519	str	data unit checksum updated 2021-07-08T02:23:27

Data: FITS image [float32, 500]

HDU6

EXTNAME = THRPUTCORR_MOD

Model multiplicative throughput corrections for each fiber.

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	500	int
CHECKSUM	VPA5WO62VOA2VO52	str	HDU checksum updated 2021-07-08T02:23:27
DATASUM	63793519	str	data unit checksum updated 2021-07-08T02:23:27

Data: FITS image [float32, 500]

HDU7

EXTNAME = DWAVECOEFF

Vector of PCA coefficients for wavelength offsets.

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	4	int
CHECKSUM	VPA5WO62VOA2VO52	str	HDU checksum updated 2021-07-08T02:23:27
DATASUM	63793519	str	data unit checksum updated 2021-07-08T02:23:27

Data: FITS image [float32, 4]

HDU8

EXTNAME = DLSFCOEFF

Vector of PCA coefficients for LSF size changes.

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	4	int
CHECKSUM	VPA5WO62VOA2VO52	str	HDU checksum updated 2021-07-08T02:23:27
DATASUM	63793519	str	data unit checksum updated 2021-07-08T02:23:27

Data: FITS image [float32, 4]

HDU9

EXTNAME = SKYGRADPCACOEFF

Vector of gradient amplitudes for sky gradient spectra.

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	4	int
CHECKSUM	VPA5WO62VOA2VO52	str	HDU checksum updated 2021-07-08T02:23:27
DATASUM	63793519	str	data unit checksum updated 2021-07-08T02:23:27

Data: FITS image [float32, 4]