| B/cfht/obscore | Log of CFHT Exposures (CADC, 1979-) The CFHT Observation logs (original column names in green) (3048767 rows) | -c=005.128351859714407 +28.627357669327, eq=J2000, rs=0.005 |
| Column | Value | Explain (UCD) | |
| _r | 0.000 | arcsec | Distance from center (005.128351859714408+28.627357669327)[FK5/J2000] (pos.angDistance) |
| _RAJ2000 | 00 20 30.80444633146 | "h:m:s" | Right ascension (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.ra) |
| _DEJ2000 | +28 37 38.4876095767 | "d:m:s" | Declination (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.dec) |
| _RAB1950 | 00 17 53.99961002055 | "h:m:s" | Right ascension (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.ra) |
| _DEB1950 | +28 21 00.1046989893 | "d:m:s" | Declination (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.dec) |
| _Glon | 114.76721963354940 | deg | Galactic longitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lon) |
| _Glat | -33.75364882088365 | deg | Galactic latitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lat) |
| obs_publisher_did | ivo://cadc.nrc.ca/CFHT?1160107/1160107o | publisher dataset identifier (meta.id;meta.dataset) | |
| obs_collection | CFHT | short name for the data colection (meta.id;meta.dataset) | |
| facility_name | CFHT 3.6m | telescope name (meta.id;instr.tel) | |
| instrument_name | MegaPrime | instrument name (meta.id;instr) | |
| obs_id | 1160107 | internal dataset identifier (meta.id;meta.dataset) | |
| dataproduct_type | image | type of product (meta.note) | |
| calib_level | 1 | calibration level (phot.calib;arith.zp) | |
| obs_release_date | 2011-02-28T00:00:00 | s | timestamp of date the data becomes publicly available (time.epoch) |
| target_name | Abell 21 | name of intended target (meta.id) | |
| s_ra | 005.128351859714407 | deg | (i) right ascension of central coordinates (J2000) (s_ra) (pos.eq.ra;meta.main) |
| s_dec | +28.627357669327 | deg | (i) declination of central coordinates (J2000) (s_dec) (pos.eq.dec;meta.main) |
| s_fov | 1.400463925317465 | size of the region covered, ∼diameter of minimum bounding circle (instr.fov;instr.pixel) | |
| s_region | polygon 5.687677391647809 28.1290944769585 4.5735055583437 28.125705844983997 4.564347353511393 29.123628801124156 5.6879775875803045 29.126757766384777 | region bounded by observation (obs.field) | |
| s_resolution | typical spatial resolution (pos.angResolution) | ||
| s_xel1 | 18984 | dimensions (number of pixels) along one spatial axis (meta.number) | |
| s_xel2 | 19274 | dimensions (number of pixels) along the other spatial axis (meta.number) | |
| t_min | 55211.3056942 | d | start time of observation (MJD) (t_min) (time.epoch) |
| t_max | 55211.3061581 | d | end time of observation (MJD) (t_max) (time.epoch) |
| t_exptime | 40.08399963378906 | s | exposure time of observation (time.expo) |
| t_resolution | 40.08399963378906 | typical temporal resolution (time.resolution) | |
| t_xel | 1 | dimensions (number of pixels) along the time axis (time.scale) | |
| em_min | m | start spectral coordinate value (instr.bandpass) | |
| em_max | m | stop spectral coordinate value (instr.bandpass) | |
| em_res_power | 3.01108384132 | typical spectral resolution (spect.resolution) | |
| em_xel | 1 | dimensions (number of pixels) along the energy axis (phys.size) | |
| em_ucd | UCD describing the spectral axis (meta.number) | ||
| pol_states | polarization states present in the data (phys.polarization) | ||
| pol_xel | dimensions (number of pixels) along the polarization axis (phys.size) | ||
| o_ucd | phot.count | UCD describing the observable axis (pixel values) (meta.number) | |
| access_url | Datalink | URL to download the data (meta.ref.url) | |
| access_format | application/x-votable+xml;content=datalink | format of the data file (meta.note) | |
| access_estsize | estimated size of the download (meta.number) | ||
| core_id | 00000000-0000-0000-faf4-013ec241177e | (i) primary key (meta.id.part;meta.main) | |
| lastmodified | 2022-09-14T22:38:06 | s | (i) timestamp of last modification of the metadata UTC (UTC) (lastmodified) (time.epoch) |
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