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Simple TargetList Of TargetsFast Xmatch with large catalogs or Simbad
Target Name (resolved by Sesame) or Position:
 Target dimension:
NB: The epoch used for the query is the original epoch of the table(s)Radius Box size

  
B/cfht
 Viz.logos.cadc Log of CFHT Exposures (CADC, 1979-)
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Similar Catalogs
Post annotation 		img(gal)
1.B/cfht/cfhtOld Observation Log (October 2002 to 2007) (original column names in green) (631125 rows)
The column expnum provides an access to details on the exposures, and a link to the Preview and Retrieval System via the CADC

Simple ConstraintList Of Constraints
 
Query by Constraints constraints help applied on Columns (Output Order: + - )
Standard Original
ShowSortColumn  Constraint Explain   (UCD)
  expnum  (i) [1/] Exposure unique identifier (meta.id;meta.main)
  RAJ2000 "h:m:s" (n)(i) Right Ascension (J2000) at the beginning of the exposure (pos.eq.ra;meta.main)
  DEJ2000 "d:m:s" (n)(i) Declination (J2000) at the beginning of the exposure (pos.eq.dec;meta.main)
  ObsDate s (i) Observation date (based on universal time, in DMF format = seconds since 1980) (time.epoch;obs)
  ExpTime s Exposure time in seconds for the exposure (time.duration;obs.exposure)
  class (char) Class of observation, coming from cfht (Note)   (meta.code;obs)
  science (char) [YCFHOT] Exposure Science classification (Note)   (meta.code.class)
  preview (char) [YCILPST] Existence of a preview (Note)   (meta.ref.url;pos.frame)
  ObsType (char) Observation type (BIAS, FLAT, OBJECT, etc...) (meta.note)
  Object (char) Target name as typed by the observer (meta.id)
  Instrum (char) Name of the instrument (meta.id;instr)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
  Detector (char) Name of the detector in use for this exposure (meta.id;instr.det)
  airmass  (n) Value of the airmass at the beginning of the exposure (obs.airMass)
  Focus (char) Name of the telescope focus in use (meta.id;instr)
  PIname (char) Name of the Principal Investigator as typed by the support astronomer (obs.observer)
  Observer (char) Observer name as typed by the support astronomer (obs.observer)
  RelDate s Release date of the exposure in DMF format (seconds since 1980) (time.epoch)
  naxis1 pix (n) Dimension of the image (X) (instr.fov;instr.pixel)
  naxis2 pix (n) Dimension of the image (Y) (instr.fov;instr.pixel)
  runID (char) Run Identification, made of YYYY + Semester (I-II) + Country (C-F-H) + running number (meta.record;phot.color;em.opt.I)
  Comment (char) Comments as typed in by the observer (meta.note;obs.observer)
  CFHT  Dearchive Request (meta.ref.url)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
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