B/cfht Log of CFHT Exposures (CADC, 1979-)
Log of CFHT (Canadian-France-Hawaii Telescope) Exposures
National Research Council, Herzberg Institute of Astrophysics
<Dominion Astrophysical Observatory, Victoria, BC, Canada (1979-)>
ADC_Keywords: Observatory log
Description:
This database contains a log of the Canadian-France-Hawaii Telescope
observations since 1979, managed the the Canadian Astronomical Data
Center (CADC).
The data are regularly updated (see the date of the last version at
the end of this file).
Acknowledgement Requirement:
If you have used CADC facilities for your research, you should refer
to the data as obtained "from the CADC" and include the following
acknowledgment in any publication:
"Guest User, Canadian Astronomy Data Centre, which is operated by
the Herzberg Institute of Astrophysics, National Research Council
of Canada."
File Summary:
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FileName Lrecl Records Explanations
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obscore.sam 1324 10000 The CFHT Observation logs
cfht.dat 655 421738 Old Observation Log (October 2002 to 2007)
ReadMe 80 . this file
See also:
http://cadcwww.hia.nrc.ca/cfht/ : CFHT Archive home page
Byte-by-byte Description of file: obscore.sam
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Bytes Format Units Label Explanations
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1- 64 A64 --- obspublisherdid publisher dataset identifier
66- 69 A4 --- obs_collection short name for the data colection
71- 86 A16 --- facility_name ?telescope name
88- 119 A32 --- instrument_name instrument name
121- 130 A10 --- obs_id internal dataset identifier
132- 139 A8 --- dataproduct_type type of product
141- 141 I1 --- calib_level ? calibration level
143- 165 A23 s obsreleasedate timestamp of date the data becomes
publicly available
167- 230 A64 --- target_name name of intended target
232- 250 F19.15 deg RAdeg ? right ascension of central
coordinates (J2000) (s_ra)
252- 269 E18.12 deg DEdeg ? declination of central coordinates
(J2000) (s_dec)
271- 287 F17.15 --- s_fov ? size of the region covered,
∼diameter of minimum bounding circle
289- 800 A512 --- s_region region bounded by observation
802- 808 F7.5 --- s_resolution ? typical spatial resolution
810- 814 I5 --- s_xel1 ? dimensions (number of pixels)
along one spatial axis
816- 820 I5 --- s_xel2 ? dimensions (number of pixels)
along the other spatial axis
822- 834 F13.7 d t_min ? start time of observation (MJD)
(t_min)
836- 848 F13.7 d t_max ? end time of observation (MJD)
(t_max)
850- 869 F20.14 s t_exptime ? exposure time of observation
871- 890 F20.14 --- t_resolution ? typical temporal resolution
892- 898 I7 --- t_xel ? dimensions (number of pixels)
along the time axis
900- 916 E17.12 m em_min ? start spectral coordinate value
918- 934 E17.12 m em_max ? stop spectral coordinate value
936- 951 F16.11 --- emrespower ? typical spectral resolution
953- 959 A7 --- em_xel ? dimensions (number of pixels)
along the energy axis
961- 967 A7 --- em_ucd UCD describing the spectral axis
969- 975 A7 --- pol_states polarization states present in the
data
977- 983 I7 --- pol_xel ? dimensions (number of pixels) along
the polarization axis
985- 994 A10 --- o_ucd UCD describing the observable axis
(pixel values)
996-1195 A200 --- access_url URL to download the data
1197-1260 A64 --- access_format format of the data file
1262-1268 I7 --- access_estsize ? estimated size of the download
1270-1305 A36 --- core_id primary key
1307-1329 A23 s lastModified timestamp of last modification of
the metadata UTC (UTC) (lastmodified)
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Byte-by-byte Description of file: cfht.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- expnum [1/] Exposure unique identifier
8- 17 I10 mas RAmas ? Right Ascension (J2000) at the beginning
of the exposure
19- 28 I10 mas DEmas ? Declination (J2000) at the beginning of
the exposure
30- 39 I10 s ObsDate Observation date (based on universal time,
in DMF format = seconds since 1980)
41- 46 I6 s ExpTime Exposure time in seconds for the exposure
48 A1 --- class *Class of observation, coming from cfht
50 A1 --- science *[YCFHOT] Exposure Science classification
52 A1 --- preview *[YCILPST] Existence of a preview
54- 73 A20 --- ObsType Observation type (BIAS, FLAT, OBJECT, etc...)
75-144 A70 --- Object Target name as typed by the observer
146-165 A20 --- Instrum Name of the instrument
167-186 A20 --- Detector Name of the detector in use for this exposure
188-193 F6.3 --- airmass ? Value of the airmass at the beginning of
the exposure
195-214 A20 --- Focus Name of the telescope focus in use
216-285 A70 --- PIname Name of the Principal Investigator as typed
by the support astronomer
287-356 A70 --- Observer Observer name as typed by the support
astronomer
358-367 I10 s RelDate Release date of the exposure in DMF format
(seconds since 1980)
369-373 I5 pix naxis1 ? Dimension of the image (X)
375-379 I5 pix naxis2 ? Dimension of the image (Y)
381-400 A20 --- runID Run Identification, made of
YYYY + Semester (I-II) + Country (C-F-H)
+ running number
402-656 A255 --- Comment Comments as typed in by the observer
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Note on class: (uppercase letters represent Merged parameters)
B merged BIAS
C merged calibration
D merged DARK
F merged FLAT
P observation
X merged FOCUS ?
a optical alignment
b single bias
c single calibration
d single dark
f single flat
o single observation
r "RCA2 CCD" or "RETICON" detector (Coude observations only)
t Test observation
v ?
x focus frame
Note on science:
C = Not an object exposure.
F = Fake detector in use.
H = Header is not valid.
O = The tcs is turned off.
T = Start time is out of range.
Y = Is a science dataset.
Note on preview: previews (FITS H-compressed) are available
C - Calibration file error
I - Instrument not supported
L - Instrument parameter out of range
P - Dataset not public
S - Dataset is not science
T - Dataset in the todo list
Y - Dataset has been previewed
(End) G.Landais [CDS], D.Durand [CADC] 14-Sep-2016