I/282 The CMT CCD Drift Scan Survey (Evans+, 2002)
The Carlsberg Meridian Telescope CCD Drift Scan Survey
Evans D.W., Irwin M.J., Helmer L.
<Astron. Astrophys. 395, 347 (2002)>
=2002A&A...395..347E 2002A&A...395..347E
ADC_Keywords: Positional data ; Meridian observations ; Surveys
Keywords: astrometry - methods: data analysis - techniques: image processing -
techniques: photometric - catalogues - surveys
Description:
This is CMC12 (Version 1.0), an astrometric and photometric catalogue
of 6.3 million stars in the red magnitude range 9 to 17.
The Carlsberg Meridian Telescope (CMT) underwent a major upgrade in
March 1999. A 2k by 2k CCD camera was installed with a Sloan r' filter
operating in a drift scan mode. With the new system, the magnitude
limit is r'CMT=17 and the positional accuracy is about 0.035".
The main task of the CMT is to map the sky in the declination range
-3° to +30° with the aim of providing an astrometric, and
photometric, catalogue that can accurately transfer the
Hipparcos/Tycho reference frame to Schmidt plates.
The current release (Version 1.0) comprises all the observations made
between March 1999 and March 2002 with the new CCD in the declination
band -3° to +3°. It is intended to release the rest of the
catalogue later.
A more complete description is available in the documentation at
http://www.ast.cam.ac.uk/~dwe/SRF/cmc12/cmc12_documentation.ps or
http://www.ast.cam.ac.uk/~dwe/SRF/cmc12/cmc12_documentation.pdf
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
cmc12.dat 80 6279162 Main catalogue (CMC12, Version 1.0)
cmc12rej.dat 80 588206 Entries rejected from CMC12
cmc12doc.ps 132 66062 PostScript version of the paper
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See also:
I/256 : Carlsberg Meridian Catalogs (CMC1-11, 1999)
http://www.ast.cam.ac.uk/~dwe/SRF/cmc12/ : the CMC12 home page
Byte-by-byte Description of file: cmc12*.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name Identifier (IAU standard)
17- 18 I2 h RAh Right Ascension (ICRS)
20- 21 I2 min RAm Right Ascension (ICRS)
23- 29 F7.4 s RAs Right Ascension (ICRS)
31- 31 A1 --- DE- Declination sign (minus only) (ICRS)
32- 33 I2 deg DEd Declination (ICRS)
35- 36 I2 arcmin DEm Declination (ICRS)
38- 43 F6.3 arcsec DEs Declination (ICRS)
45- 50 F6.3 mag rmag Magnitude (r'CMT, Vega scale) (1)
51- 51 A1 --- pflag Photometric flag (2)
52- 53 I2 --- Ntot Total number of observations (3)
54- 55 I2 --- Nast Number of astrometric observations
56- 57 I2 --- Nphot Number of photometric observations
58- 63 F6.3 arcsec e_RAs Standard deviation of right ascension (4)
64- 69 F6.3 arcsec e_DEs Standard deviation of declination (4)
70- 75 F6.3 mag e_rmag Standard deviation of magnitude (5)
77- 80 I4 d JD-2451264 Mean epoch of the astrometry (6)
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Note (1): The filter is nominally the same as that for SDSS r'. The CCD used
is a Kodak KAF-4202. Early tests have shown no colour terms between
the SDSS r' standards and the CMT r' photometry.
Note (2): If non-photometric ":", blank otherwise
Note (3): Includes bad observations
Note (4): 0.0 if Nast ≤ 1
Note (5): 0.0 if Nphot ≤ 1
Note (6): Days since JD 2451264 (26/3/1999) ie. observations taken on the
evening of 26 March 1999 (first light) are epoch 0.
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Contact email:
Dafydd Wyn Evans
(End) Dafydd Wyn Evans [IoA] 09-Jul-2002