Visit
Metadata about the pointings of the DC2 simulated survey, largely associated with the boresight of the entire focal plane.
Columns
| name | datatype | description | unit | nullable | ivoa:ucd | tap:column_index | tap:principal | votable:arraysize | votable:xtype | length | precision |
|---|---|---|---|---|---|---|---|---|---|---|---|
| visit primary key | long | Unique identifier. | true | meta.id;obs;meta.main | 1 | 1 | |||||
| physical_filter | char | ID of physical filter, the filter associated with a particular instrument. | true | meta.id;instr.filter | 11 | 0 | * | 32 | |||
| band | char | Name of the band used to take the exposure where this source was measured. Abstract filter that is not associated with a particular instrument. | true | meta.id;instr.bandpass | 10 | 1 | * | 1 | |||
| ra | double | RA of focal plane center. | deg | true | pos.eq.ra;meta.main | 2 | 1 | ||||
| decl | double | Declination of focal plane center | deg | true | pos.eq.dec;meta.main | 3 | 1 | ||||
| skyRotation | double | Sky rotation angle. | deg | true | pos.posAng | 4 | 1 | ||||
| azimuth | double | Azimuth of focal plane center at the middle of the exposure. | deg | true | pos.az.azi | 14 | 0 | ||||
| altitude | double | Altitude of focal plane center at the middle of the exposure. | deg | true | pos.az.alt | 13 | 0 | ||||
| zenithDistance | double | Zenith distance at the middle of the exposure. | deg | true | pos.az.zd | 15 | 0 | ||||
| airmass | double | Airmass of the observed line of sight. | true | obs.airMass | 12 | 1 | |||||
| expTime | double | Spatially-averaged duration of exposure, accurate to 10ms. | s | true | time.duration;obs.exposure | 9 | 1 | ||||
| expMidpt | timestamp | Midpoint time for exposure at the fiducial center of the focal plane array. TAI, accurate to 10ms. | true | 6 | 0 | * | timestamp | 6 | |||
| expMidptMJD | double | Midpoint time for exposure at the fiducial center of the focal plane array in MJD. TAI, accurate to 10ms. | d | true | time.epoch;obs.exposure | 5 | 1 | ||||
| obsStart | timestamp | Start time of the exposure at the fiducial center of the focal plane array, TAI, accurate to 10ms. | true | time.start;obs.exposure | 8 | 0 | * | timestamp | 6 | ||
| obsStartMJD | double | Start of the exposure in MJD, TAI, accurate to 10ms. | d | true | time.start;obs.exposure | 7 | 0 |