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II/252              The DENIS database, 2nd Release     (DENIS Consortium, 2003)

Second release of DENIS data (07 April 2003) The DENIS consortium <The DENIS consortium (2003)>
ADC_Keywords: Infrared sources ; Photometry, infrared ; Surveys Keywords: infrared: stars - Galaxy: stellar content - stars: low-mass, brown dwarfs - astronomical data bases: miscellaneous - surveys Description: This catalogue is an intermediate release of the DENIS project. It consists of a set of 195204157 point sources detected by the DENIS survey in 2239 strips (covering each 30 degrees in declination and 12 arcmin in right ascension). The data in this release cover approximately 11000 square degrees of the Southern sky. Multiple detections of single point sources have been merged in image overlaps within individual strips, but sources can have multiple detections in overlapping strips. The complete set of data collected by DENIS in the period 1996-2001 will be released towards the end of 2003. DENIS is the only astronomical survey of the Southern sky made in two near-infrared bands (J at 1.25µm, and Ks at 2.15µm) and one optical band (Gunn-i at 0.82µm), with limiting magnitudes 14.0, 16.5 and 18.5, respectively. It was conducted by a European consortium, using the 1m telescope at ESO, La Silla (Chile). The DENIS instrument is made up of a 3-channel camera built of commercially available detector arrays by the Observatoire de Paris and with major contributions from other European Institutes, notably: the IAS in Frascati, the Observatoire de Grenoble, the University of Innsbruck, the Observatoire de Lyon, and the IAC in Tenerife. The survey is carried out by observing strips of 30° in declination and 12arcminutes in Right Ascension with an overlap of 2arcminutes between consecutive strips. The survey started at the end of 1995 and has been completed up to 97% in 2001. The data have been reduced at the Institut d'Astrophysique de Paris and Observatoire de Paris. The position of a general extracted point source is provided with an accuracy better than 1arcsec and its magnitude to better than 0.1mag. The Centre de Donnees Astronomiques de Strasbourg (CDS) is releasing the final databases and provides access of the processed and calibrated data to the worldwide community. The principal investigator of the DENIS project is N. Epchtein (Observatoire de la Cote d'Azur); the Co-PI in charge of data processing is G. Simon (observatoire de Paris); J. Borsenberger and B. de Batz, with the help of F. Tanguy, S. Begon and P. Texier, processed the data and implemented the working data base at PDAC; S. Derriere is in charge of the data release at CDS. Scientists and engineers from seven European countries and from Brazil are involved in the data qualification and analysis. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . The present file denis.sam 479 1000 Sample of DENIS output
See also: http://cdsweb.u-strasbg.fr/denis.html : DENIS documentation II/240 : Preliminary database of DENIS point sources (1999A&A...349..236E) J/A+AS/135/133 : First DENIS I-band extragalactic catalog (Vauglin+ 1999) 2000A&AS..141..313F : An Absolute Calibration of DENIS (Fouque et al.) Nomenclature Notes: The recommended way to designate the DENIS sources is DENIS JHHMMSS.s-DDMMSS Byte-by-byte Description of file: denis.sam
Bytes Format Units Label Explanations
1- 16 A16 --- DENIS DENIS name, identifier 18- 24 I7 --- Image DENIS image number (1) 26- 30 I5 --- Strip DENIS strip number 32- 41 F10.6 deg RAdeg Right ascension (J2000) 43- 52 F10.6 deg DEdeg Declination (J2000) -------------------------------------------------------------------------------- 54- 59 F6.3 mag Imag ?Magnitude in I band from PSF fit 61- 65 F5.2 mag e_Imag ?Magnitude error in I band from PSF fit 67- 72 F6.3 mag Jmag ?Magnitude in J band from PSF fit 74- 78 F5.2 mag e_Jmag ?Magnitude error in J band from PSF fit 80- 85 F6.3 mag Kmag ?Magnitude in K band from PSF fit 87- 91 F5.2 mag e_Kmag ?Magnitude error in K band from PSF fit 93- 98 F6.3 mag Imag5.5 ?Magnitude in I band from 5.5'' aperture 100-104 F5.2 mag e_Imag5.5 ?Error in I band mag from 5.5'' aperture 106-111 F6.3 mag Jmag5.5 ?Magnitude in J band from 5.5'' aperture 113-117 F5.2 mag e_Jmag5.5 ?Error in J band mag from 5.5'' aperture 119-124 F6.3 mag Kmag5.5 ?Magnitude in K band from 5.5'' aperture 126-130 F5.2 mag e_Kmag5.5 ?Error in K band mag from 5.5'' aperture 132-137 F6.3 mag Imag4.5 ?Magnitude in I band from 4.5'' aperture 139-143 F5.2 mag e_Imag4.5 ?Error in I band mag from 4.5'' aperture 145-150 F6.3 mag Jmag4.5 ?Magnitude in J band from 4.5'' aperture 152-156 F5.2 mag e_Jmag4.5 ?Error in J band mag from 4.5'' aperture 158-163 F6.3 mag Kmag4.5 ?Magnitude in K band from 4.5'' aperture 165-169 F5.2 mag e_Kmag4.5 ?Error in K band mag from 4.5'' aperture 171-176 F6.3 mag Imag3.5 ?Magnitude in I band from 3.5'' aperture 178-182 F5.2 mag e_Imag3.5 ?Error in I band mag from 3.5'' aperture 184-189 F6.3 mag Jmag3.5 ?Magnitude in J band from 3.5'' aperture 191-195 F5.2 mag e_Jmag3.5 ?Error in J band mag from 3.5'' aperture 197-202 F6.3 mag Kmag3.5 ?Magnitude in K band from 3.5'' aperture 204-208 F5.2 mag e_Kmag3.5 ?Error in K band mag from 3.5'' aperture 210-215 F6.3 mag Imag3.5c ?I band Magnitude in 3.5'' corrected aperture 217-221 F5.2 mag e_Imag3.5c ?I band mag error in 3.5'' corrected aperture 223-228 F6.3 mag Jmag3.5c ?J band Magnitude in 3.5'' corrected aperture 230-234 F5.2 mag e_Jmag3.5c ?J band mag error in 3.5'' corrected aperture 236-241 F6.3 mag Kmag3.5c ?K band Magnitude in 3.5'' corrected aperture 243-247 F5.2 mag e_Kmag3.5c ?K band mag error in 3.5'' corrected aperture 249-254 F6.3 mag Imag2.5c ?I band Magnitude in 2.5'' corrected aperture 256-260 F5.2 mag e_Imag2.5c ?I band mag error in 2.5'' corrected aperture 262-267 F6.3 mag Jmag2.5c ?J band Magnitude in 2.5'' corrected aperture 269-273 F5.2 mag e_Jmag2.5c ?J band mag error in 2.5'' corrected aperture 275-280 F6.3 mag Kmag2.5c ?K band Magnitude in 2.5'' corrected aperture 282-286 F5.2 mag e_Kmag2.5c ?K band mag error in 2.5'' corrected aperture 288-293 F6.3 mag Imag1.5c ?I band Magnitude in 1.5'' corrected aperture 295-299 F5.2 mag e_Imag1.5c ?I band mag error in 1.5'' corrected aperture 301-306 F6.3 mag Jmag1.5c ?J band Magnitude in 1.5'' corrected aperture 308-312 F5.2 mag e_Jmag1.5c ?J band mag error in 1.5'' corrected aperture 314-319 F6.3 mag Kmag1.5c ?K band Magnitude in 1.5'' corrected aperture 321-325 F5.2 mag e_Kmag1.5c ?K band mag error in 1.5'' corrected aperture -------------------------------------------------------------------------------- 327-330 F4.1 mag Rmag ?R magnitude of USNOA2.0 nearest match 332-335 F4.1 mag Bmag ?B magnitude of USNOA2.0 nearest match 337-339 I3 --- q_Imag [0,100]?Quality flag for I band (100=top) 341-343 I3 --- q_Jmag [0,100]?Quality flag for J band (100=top) 345-347 I3 --- q_Kmag [0,100]?Quality flag for K band (100=top) 349-351 I3 % Ipsf [0,100]?Correlation to PSF for I band (4) 353-355 I3 % Jpsf [0,100]?Correlation to PSF for J band (4) 357-359 I3 % Kpsf [0,100]?Correlation to PSF for K band (4) 361-364 F4.2 --- IMpsf [0,1]?Mean correlation to PSF in I band (4) 366-369 F4.2 --- JMpsf [0,1]?Mean correlation to PSF in J band (4) 371-374 F4.2 --- KMpsf [0,1]?Mean correlation to PSF in K band (4) 376-380 F5.1 pix Ix ?Pixel x position in I band 382-386 F5.1 pix Iy ?Pixel y position in I band 388-392 F5.1 pix Jx ?Pixel x position in J band 394-398 F5.1 pix Jy ?Pixel y position in J band 400-404 F5.1 pix Kx ?Pixel x position in K band 406-410 F5.1 pix Ky ?Pixel y position in K band -------------------------------------------------------------------------------- 412-421 F10.6 deg A2RAdeg ?Right Ascension of USNOA2.0 nearest match 423-432 F10.6 deg A2DEdeg ?Declination of USNOA2.0 nearest match 434-441 F8.3 yr A2Ep ?Epoch of USNOA2.0 nearest match 443-447 I5 mas Dist ?Distance to USNOA2.0 nearest match 449-462 F14.6 d ObsJD Julian day for DENIS observation 464-467 A4 --- Iflg ?Image and source flag in I band (2) 469-472 A4 --- Jflg ?Image and source flag in J band (2) 474-477 A4 --- Kflg ?Image and source flag in K band (2) 479 I1 --- mult ?Multiplicity flag (3)
Note (1): the image number is incremented at each image taken during the survey. In case a source results from the merging of two consecutive overlapping images (N and N+1) in the same strip (Flag_mult set to 1, see Note 3), the image number corresponds to the first image N. Note (2): This flag is the concatenation of image and source flags, in hexadecimal format. For the image flag, the first two digits contain: Bit 0 (0100) clouds during observation Bit 1 (0200) electronic Read-Out problem Bit 2 (0400) internal temperature problem Bit 3 (0800) very bright star Bit 4 (1000) bright star Bit 5 (2000) stray light Bit 6 (4000) unknown problem For the source flag, the last two digits contain: Bit 0 (0001) source might be a dust on mirror Bit 1 (0002) source is a ghost detection of a bright star Bit 2 (0004) source is saturated Bit 3 (0008) source is multiple detect Bit 4 (0010) reserved Note (3): if set to 1, this flag indicates that the source was detected in two consecutive images, and that the 2 measurements have been combined Note (4): the correlation with the PSF is higher for the point sources, whereas cosmics have a very low correlation. The mean correlation values xMpsf are a function of the magnitude only, and do not depend on individual sources.
Acknowledgements: DENIS is the result of a joint effort involving human and financial contributions of several Institutes mostly located in Europe. It has been supported financially mainly by the French Institut National des Sciences de l'Univers, CNRS, and French Education Ministry, the European Southern Observatory, the State of Baden-Wuerttemberg, and the European Commission under networks of the SCIENCE and Human Capital and Mobility programs, the Landessternwarte, Heidelberg, l'Institut d'Astrophysique de Paris, the Institut fur Astrophysik der Universitat Innsbruck and Instituto de Astrofisica de Canarias. History: * 07-Apr-2003: Installation at CDS, as catalog "B/denis" * 22-Sep-2005: Becomes catalog "II/252" References: References: The DENIS Consortium (April 2003)
(End) Nicolas Epchtein [OCA], Sebastien Derriere [CDS] 07-Apr-2003
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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