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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
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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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 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 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)
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.
Contact email: Dafydd Wyn Evans
(End) Dafydd Wyn Evans [IoA] 09-Jul-2002
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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