tiles-SPECPROD.fits¶
- Summary:
Table containing cumulative observational metadata as well as derived quantities estimating the observational “depth” for each target class, quoted in seconds of effective, idealized observing time.
- Naming Convention:
tiles-{SPECPROD}.fits, where{SPECPROD}is the official name of the full reduction, e.g.everest.- Regex:
tiles-[a-z0-9_-]+.fits- File Type:
FITS, 165 KB
Contents¶
Number |
EXTNAME |
Type |
Contents |
|---|---|---|---|
IMAGE |
Empty |
||
TILE_COMPLETENESS |
BINTABLE |
Per-tile metadata |
FITS Header Units¶
HDU0¶
This HDU has no non-standard required keywords.
Empty HDU.
HDU1¶
EXTNAME = TILE_COMPLETENESS
Binary table containing metadata about individual DESI tiles. This includes cumulative observational information as well as derived quantities estimating the observational “depth” for each target class, quoted in seconds of effective, idealized observing time.
Required Header Keywords¶
Required Header Keywords Table
KEY |
Example Value |
Type |
Comment |
|---|---|---|---|
NAXIS1 |
218 |
int |
length of dimension 1 |
NAXIS2 |
732 |
int |
length of dimension 2 |
Required Data Table Columns¶
Name |
Type |
Units |
Description |
|---|---|---|---|
TILEID |
int32 |
Unique DESI tile ID |
|
SURVEY |
char[20] |
Survey name |
|
PROGRAM |
char[6] |
Program name |
|
FAPRGRM |
char[20] |
PROGRAM in fiberassign file |
|
FAFLAVOR |
char[20] |
FLAVOR in fiberassign file |
|
NEXP |
int64 |
Number of exposures used in EFFTIME estimates |
|
EXPTIME |
float64 |
s |
Actual exposure time |
TILERA |
float64 |
deg |
RA of tile given in fiberassign file |
TILEDEC |
float64 |
deg |
DEC of tile given in fiberassign file |
EFFTIME_ETC |
float64 |
s |
Effective exposure time for nominal conditions derived from exposure ETC data |
EFFTIME_SPEC |
float64 |
s |
Effective exposure time for nominal conditions derived from the TSNR2 fits to the spectroscopy |
EFFTIME_GFA |
float64 |
s |
Effective exposure time for nominal conditions derived from exposure GFA data |
GOALTIME |
float64 |
s |
Goal for total effective exposure time for the tile |
OBSSTATUS |
char[20] |
Observing conditions bitmask |
|
LRG_EFFTIME_DARK |
float64 |
s |
Effective exposure time for nominal dark conditions inferred for LRG targets |
ELG_EFFTIME_DARK |
float64 |
s |
Effective exposure time for nominal dark conditions inferred for ELG targets |
BGS_EFFTIME_BRIGHT |
float64 |
s |
Effective exposure time for nominal bright conditions inferred for BGS targets |
LYA_EFFTIME_DARK |
float64 |
s |
Effective exposure time for nominal dark conditions inferred for LYA targets |
GOALTYPE |
char[20] |
The intended observing conditions for the tile |
|
MINTFRAC |
float64 |
Minimum fraction of GOALTIME acceptable for considering a tile complete |
|
LASTNIGHT |
int32 |
Most recent night with a good exposure |
Notes and Examples¶
For the definition of OBSCONDITIONS please see the bitmask documentation page for the definition of the bits.