PROTODESI_FPC
- Summary:
Data model for protoDESI Fiber Photometry Camera images for ProtoDESI.
- Naming Convention:
PROTODESI_FPC_{EXPID}.fits, where{EXPID}is the 8-digit exposure ID.- Regex:
PROTODESI_FPC_[0-9]{8}.fitsGive a regular expression for this filename. For example, a six-digit number would correspond to ``[0-9]{6}``.- File Type:
FITS, 16 MB This section gives the type of the file and its approximate size.
Contents
Number |
EXTNAME |
Type |
Contents |
|---|---|---|---|
PRIMARY |
NPIX1xNPIX2 float image |
Raw image |
FITS Header Units
HDU0
EXTNAME = PRIMARY
Raw image
Header Keywords (dump)
KEY |
Example Value |
Type |
Comment |
|---|---|---|---|
NAXIS1 |
3352 |
int |
length of data axis 1 |
NAXIS2 |
2532 |
int |
length of data axis 2 |
BZERO |
32768 |
int |
offset data range to that of unsigned short |
BSCALE |
1 |
int |
default scaling factor or unsigned short |
DEVICE |
FPC |
str |
imaging device |
DATE-OBS |
2016-08-17T17:49:22.235092 |
str |
datetime at observation start (UTC) |
TIME-OBS |
17:49:22.235092 |
str |
time at observation start (UTC) |
MJD-OBS |
57617.74261846 |
float |
MJD at observation start |
OPENSHUT |
2016-08-17T17:49:22.235092 |
str |
time at shutter open (UTC) |
LST |
08:09:06.860 |
str |
LST at observation start (HH:mm:ss.ss) |
EXPREQ |
1.0 |
float |
[s] Requested Exposure duration, also defined as REQTIME |
FILENAME |
/data/images/PROTODESI_FPC_00000050.fits |
str |
absolute path of file on desirpi1 |
CCDTEMP |
-1.907 |
float |
CCD temperature before or after exposure? |
CCDSET |
-9.788 |
float |
setpoint of CCD TEC |
CCDPOWER |
100.0 |
float |
cooling power of TEC |
TECFROZE |
F |
bool |
whether TEC is frozen or not |
INSTRUME |
PROTODESI |
str |
instrument |
EXPNUM |
50 |
int |
exposure ID |
CCDCOOL |
T |
bool |
whether TEC is enabled or not |
CHECKSUM |
R2QLS1OIR1OIR1OI |
str |
HDU checksum updated 2016-08-17T17:49:25 |
DATASUM |
2903024359 |
str |
data unit checksum updated 2016-08-17T17:49:25 |
Other Header Keywords (not currently present)
KEY |
Example Value |
Type |
Comment |
|---|---|---|---|
XTENSION |
BINTABLE, IMAGE |
str |
binary table written by MWRFITS v1.8 |
BITPIX |
16 |
int |
required value |
NAXIS |
2 |
int |
required value |
PCOUNT |
0 |
int |
normally 0 (no varying arrays) |
GCOUNT |
1 |
int |
required value |
TFIELDS |
int |
number of columns in table |
|
TIMESYS |
UTC |
str |
time system |
EXPTIME |
1500.1 |
float |
measured exposure time |
CCDBIN1 |
1 |
int |
pixel binning, axis 1 |
CCDBIN2 |
1 |
int |
pixel binning, axis 2 |
TELEQUIN |
2000.0 |
float |
equinox of telescope coordinates |
TELRA |
19:17:34.440 |
str |
[HH:MM:SS] telescope RA |
RA |
19:17:34.440 |
str |
[HH:MM:SS] RA |
TELDEC |
20:39:59.760 |
str |
[DD:MM:SS] telescope DEC |
DEC |
00:00:48.240 |
str |
[DD:MM:SS] DEC |
HA |
20:39:59.760 |
str |
[HH:MM:SS] telescope hour angle |
ZD |
30.7000 |
float |
[deg] telescope zenith distance |
AIRMASS |
1.1620 |
float |
Airmass |
TELFOCUS |
1.22, 145.3, 2.9, 4300.1, 0.2,0.0 |
str |
DESI hexapod settings |
TELSTAT |
Track |
str |
telescope tracking status |
FIELDID |
2321 |
int |
DESI field identifier |
OBSTYPE |
object |
str |
observation type: zero, dark, dome flat, sky flat, object, test, calibration, guider |
SEQID |
4x4 dither |
str |
sequence name |
SEQNUM |
2 |
int |
number of image in sequence |
SEQTOT |
16 |
int |
total number of images in sequence |
KEY |
Example Value |
Type |
Comment |
|---|---|---|---|
F0-RA |
float |
fiber 0 RA |
|
F0-DEC |
float |
fiber 0 DEC |
|
F1-RA |
float |
fiber 1 RA |
|
F1-DEC |
float |
fiber 1 DEC |
|
F2-RA |
float |
fiber 2 RA |
|
F2-DEC |
float |
fiber 2 DEC |
|
FIPOS |
T |
bool |
fiber positioner data available if true |
CYCLES |
3 |
int |
number of positioner iterations |
ONTARGET |
3 |
int |
number of fibers on target |
FAILED |
5 |
int |
number of failed fiber assignments |
MAXRES |
12.5 |
float |
[micron] maximum target-fiber position residual |
KEY |
Example Value |
Type |
Comment |
|---|---|---|---|
GS-FILE |
str |
guide Star filename |
|
GS-RA |
float |
guide ref pixel RA |
|
GS-DEC |
float |
guide ref pixel DEC |
|
GS-X |
float |
guide ref pixel X |
|
GS-Y |
float |
guide ref pixel Y |
KEY |
Example Value |
Type |
Comment |
|---|---|---|---|
GUIDER |
1 |
int |
guider (0-absent,1-ok,2-lost star,3-lost all stars) |
G-MODE |
auto |
str |
guider operation mode |
G-CCDNUM |
4 |
int |
number of active guide CCDs |
G-FEEDBK |
0.75 |
float |
guider feedback percentage |
G-MEANX |
0.1 |
float |
Guider x-axis mean offsets |
G-MEANY |
0.2 |
float |
Guider y-axis mean offsets |
G-MEANX2 |
12.1 |
float |
Guider x-axis second moment mean offsets |
G-MEANY2 |
12.1 |
float |
Guider y-axis second moment mean offsets |
G-MEANXY |
12.1 |
float |
Guider cross-axis second moment mean offsets |
G-MAXX |
0.9 |
float |
Guider x-axis maximum offset |
G-MAXY |
0.9 |
float |
Guider y-axis maximum offset |
G-FLXVAR |
12.4 |
float |
Guide stars flux variance |
G-TRANSP |
0.8 |
float |
Guider average sky transparency |
G-SEEING |
0.5 |
float |
[arcsec] Guider average seeing |
G-LATENC |
0.15 |
float |
[s] Guider average latency between exposures |
G-EXPTIM |
0.5 |
float |
[s] Guider average exposure time |
Data: FITS image [int16, 3352x2532]
Notes and Examples
The missing keywords listed above in the Other Keywords section, grouped roughly by categories, are either found in an older version of data model, or defined in DESI-1229 and deemed relevant for protoDESI run.
While this data model is up to date, FPC and GFA images may not be in their final shape and are subject to change.