B/dao DAO Science Archive observations (CADC, 2020)
Dominion Astrophysical Observatory (DAO)
National Research Council, Herzberg Institute of Astrophysics
<Dominion Astrophysical Observatory, Victoria, BC, Canada>
ADC_Keywords: Observatory log
Abstract:
The DAO archives are operated by the Canadian Astronomy Data Centre (CADC).
These consist of two separate collections: the DAO Science Archive and the DAO
Spectroscopic Plate Archive.
The DAO Science Archive consists of modern electronic data obtained with the
DAO's 1.8-m Plaskett telescope as well as the 1.2-m telescope and McKellar
spectrograph. This collection is updated on a daily basis with new data and,
as time permits, archival CCD data are also being added.
The DAO spectroscopic plate collection in its entirety consists of over
16,800 high-dispersion spectrograms exposed at the coude focus of the 1.2-m
DAO telescope and McKellar spectrograph between 1962 and 2000, and more than
93,000 secured at the Cassegrain focus of the DAO 1.8-m telescope and
spectrograph between 1918 and 1984. The very great majority of those plates
is now in the NRC-Herzberg plate archive. Since a programme to digitize them
with the modified in-house PDS has only recently commenced (and with limited
resources) there is currently a rather modest number of digital files
available for download. However, if you have questions about the availability
of plates of a target of particular interest you can we encourage you to
contact Elizabeth Griffin or David Bohlender at NRC-Herzberg
(), ) so that
we can search the collection for plates that may be of interest to your
research.
Both archives allow searches by important criteria such as object name, date,
and wavelength and presents the results of the search in a tabular format.
The CADC's Data Retrieval facility allows archive users to download archival
data directly to their own computers.
Proprietary data can also be retrieved, but only by the Principal Investigator
(PI) of the science program in question and any colleagues the PI has granted
access to that program's data. These users must also register with the CADC in
order to enable authorization tests to be made before such proprietary data is
accessed. The proprietary period for DAO pixel data is 12 months from the time
of the observation. Metadata associated with the pixel data
(i.e. the FITS header) is public immediately.
Because of uncertainties in the absolute pointing accuracy of the DAO
telescopes, it is recommended that a relatively large search radius (e.g. 5')
be used in any DAO archive searches for specific targets.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . this file
obscore.sam 1799 1000 DAO Science Archive observations
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See also:
http://cadcwww.hia.nrc.ca/dao/ : DAO Archive home page
* B/cfht : CFHT observations (CADC archive)
* B/HST : HST observations (CADC archive)
* G/Gemini: GEMINI observations (CADC archive)
Byte-by-byte Description of file: obscore.sam
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Bytes Format Units Label Explanations
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1- 256 A256 --- obspublisherdid publisher dataset identifier
(caomPlaneURI)
258- 289 A32 --- obs_collection short name for the data colection
291- 322 A32 --- facility_name telescope name
324- 387 A64 --- instrument_name instrument name
389- 516 A128 --- obs_id internal dataset identifier
518- 549 A32 --- dataproduct_type type of product
551- 551 I1 --- calib_level ? calibration level (0,1,2,3)
553- 575 A23 s obsreleasedate timestamp of date the data becomes
publicly available
577- 640 A64 --- target_name ? name of intended target
642- 656 F15.11 deg RAdeg ? RA of central coordinates (J2000)
(s_ra)
658- 673 F16.12 deg DEdeg ? DEC of central coordinates (J2000)
(s_dec)
675- 690 F16.14 deg s_fov ? size of the region covered
(∼diameter of minimum bounding circle)
692-1203 A512 --- s_region ? region bounded by observation
1205-1208 F4.0 arcs s_resolution ? typical spatial resolution
1210-1213 I4 --- s_xel1 ? dimensions (number of pixels)
along one spatial axis
1215-1218 I4 --- s_xel2 ? dimensions (number of pixels)
along the other spatial axis
1220-1232 F13.7 d t_min ? start time of observation (MJD)
(t_min)
1234-1246 F13.7 d t_max ? end time of observation (MJD)
(t_max)
1248-1253 F6.1 s t_exptime ? exposure time of observation
1255-1260 F6.1 s t_resolution ? typical temporal resolution
1262-1262 I1 --- t_xel ? dimensions (number of pixels)
along the time axis
1264-1276 E13.8 m em_min ? start spectral coordinate value
1278-1290 E13.8 m em_max ? stop spectral coordinate value
1292-1308 F17.11 --- emrespower ? typical spectral resolution
1310-1313 I4 --- em_xel ? dimensions (number of pixels)
along the energy axis
1315-1346 A32 --- em_ucd ? UCD describing the spectral axis
1348-1379 A32 --- pol_states ? polarization states present in the
data
1381-1381 I1 --- pol_xel ? dimensions (number of pixels)
along the polarization axis
1383-1414 A32 --- o_ucd ? UCD describing the observable axis
(pixel values)
1416-1671 A256 --- access_url ? URL to download the data
1673-1736 A64 --- access_format ? format of the data files
1738-1738 I1 kbyte access_estsize ? estimated size of the
download
1740-1775 A36 --- core_id ? primary key
1777-1799 A23 s lastModified ? timestamp of last modification of
the metadata
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Acknowledgements:
see http://www.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/en/dao/credits.html
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."
(End) D.durand [CADC], Gilles Landais [CDS] 22-Jun-2020
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Acknowledgements:
see http://www.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/en/dao/credits.html
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."
(End) D.durand [CADC], Gilles Landais [CDS] 22-Jun-2020