sv2mtl-backup-hp-HPX

Summary:: MTL ledgers for the DESI backup program.
Naming Convention:: sv2mtl-backup-hp-HPX.ecsv, where HPX is the nside=32 (NESTED) HEALPixel integer.
Regex:: sv2mtl-backup-hp-[0-12287]\.ecsv
File Type:: ecsv, 500-1000 KB

Contents

EXTNAME	Type	Contents
MTL	TABLE	MTL Ledger

KEY	Example Value	Type	Comment
FILEHPX	2802	int	HEALPixel integer for the file
FILENEST	True	bool	If the HEALPixel NESTED scheme was used for the file (should always be True)
FILENSID	32	int	HEALPixel nside used for the file (should always be 32)
GAIADR	2	int	Gaia Data Release used to produce (photometric quantities for) the targets
INDIR	gaiadr2/0.53.0/targets/sv2/resolve/backup/	str	Location of the directory of targets used to produce the file
OBSCON	BACKUP	str	DESI program (DARK, BRIGHT or BACKUP)
SURVEY	sv2	str	DESI survey phase (main, sv2 or sv3)

Name	Type	Units	Description
RA	float64	deg	Right ascension
DEC	float64	deg	Declination
REF_EPOCH	float32	yr	Reference epoch for Gaia/Tycho astrometry
PARALLAX	float32	mas	Parallax
PMRA	float32	mas/yr	Proper motion in the RA direction
PMDEC	float32	mas/yr	Proper motion in the Dec direction
TARGETID	int64		Unique DESI targeting ID
SV2_DESI_TARGET	int64		DESI (dark time program) target selection bitmask
SV2_BGS_TARGET	int64		BGS (bright time program) target selection bitmask
SV2_MWS_TARGET	int64		MWS (bright time program) target selection bitmask
SUBPRIORITY	float64		Random subpriority [0-1] to break assignment ties
OBSCONDITIONS	int32		Observing conditions/program bitmask (bright/dark/backup/etc.)
PRIORITY_INIT	int64		Target’s initial priority from target selection bitmasks and OBSCONDITIONS
NUMOBS_INIT	int64		Target’s initial desired number of observations
SV2_SCND_TARGET	int64		Target selection bitmask for secondary programs
NUMOBS_MORE	int64		Desired number of observations given target’s current state
NUMOBS	int64		Number of (good) observations of target acquired so far
Z	float64		Redshift measured by Redrock
ZWARN	int64		Redshift warning bitmask measured by Redrock
ZTILEID	int32		ID of tile that most recently updated target’s state
TARGET_STATE	char[16]		Combination of target’s class and its current observational state
TIMESTAMP	char[19]	s	UTC time at which the target’s state was updated
VERSION	char[6]		Version of desitarget code used to update target’s state
PRIORITY	int64		Target’s current priority