obslistYYYYMMDD

Summary:

List of tiles observed, along with tile info and observing conditions.

Naming Convention:

obslistYYYYMMDD.fits, where YYYYMMDD is the date of the start of the night of observations.

Regex:

obslist20([0-9]{2})(0[1-9]|1[0-2])(0[1-9]|1[0-9]|2[0-9]|3[0-1])\.fits

File Type:

FITS, 10-15 KB.

Contents

Number	EXTNAME	Type	Contents
HDU0		IMAGE	N/A
HDU1		BINTABLE	Observed tiles

FITS Header Units

HDU0

N/A.

This HDU has no non-standard required keywords.

Empty HDU.

HDU1

Table of observed tiles.

Required Header Keywords

KEY	Example Value	Type	Comment
NAXIS1	152	int	length of dimension 1
NAXIS2	30	int	length of dimension 2

Required Data Table Columns

Name	Type	Units	Description
TILEID	int32		DESI tile ID
RA	float64	deg	right ascension
DEC	float64	deg	declination
PROGRAM	char[8]		‘DARK’, ‘BRIGHT’ or ‘GRAY’
EBMV	float64		Extinction
MAXLEN	float64	sec	Maximum exposure length
MOONFRAC	float64		Fraction of the Moon’s illuminated surface
MOONDIST	float64	deg	Distance between the Moon and the tile centre.
MOONALT	float64	deg	Elevation of the Moon
SEEING	float64	“	Seeing
LINTRANS	float64		Linear transparency
AIRMASS	float64		Airmass
DESSN2	float64		Design (S/N)^2
STATUS	int32		1 or 2 if partially or fully observed
EXPTIME	float64	sec	Exposure time
OBSSN2	float64		Achieved (S/N)^2
DATE-OBS	char[24]		Date and time of observation
MJD	float64	days	Modified Julian Date of observation

Notes and Examples

The status can also be 0, but tiles with status==0 should not be in this table.