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:
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FileName Lrecl Records Explanations
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ReadMe 80 . The present file
denis.sam 469 1000 Sample of DENIS output
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See also:
http://cdsweb.u-strasbg.fr/denis.html : DENIS documentation
II/240 : Preliminary database of DENIS point sources (1999A&A...349..236E 1999A&A...349..236E)
J/A+AS/135/133 : First DENIS I-band extragalactic catalog (Vauglin+ 1999)
2000A&AS..141..313F 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 output: denis.sam
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Bytes Format Units Label Explanations
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1- 16 A16 --- DENIS DENIS name, identifier
18- 27 F10.6 deg RAJ2000 Right ascension (J2000)
29- 38 F10.6 deg DEJ2000 Declination (J2000)
40- 46 I7 --- Image DENIS image number (1)
48- 52 I5 --- Strip DENIS strip number
54- 59 F6.3 mag Imag ?Magnitude in I band from PSF fit
61- 64 F4.2 mag e_Imag ?Magnitude error in I band from PSF fit
66- 71 F6.3 mag Jmag ?Magnitude in J band from PSF fit
73- 76 F4.2 mag e_Jmag ?Magnitude error in J band from PSF fit
78- 83 F6.3 mag Kmag ?Magnitude in K band from PSF fit
85- 89 F5.2 mag e_Kmag ?Magnitude error in K band from PSF fit
91- 96 F6.3 mag Imag5.5 ?Magnitude in I band from 5.5'' aperture
98-102 F5.2 mag e_Imag5.5 ?Error in I band mag from 5.5'' aperture
104-109 F6.3 mag Jmag5.5 ?Magnitude in J band from 5.5'' aperture
111-115 F5.2 mag e_Jmag5.5 ?Error in J band mag from 5.5'' aperture
117-122 F6.3 mag Kmag5.5 ?Magnitude in K band from 5.5'' aperture
124-128 F5.2 mag e_Kmag5.5 ?Error in K band mag from 5.5'' aperture
130-135 F6.3 mag Imag4.5 ?Magnitude in I band from 4.5'' aperture
137-141 F5.2 mag e_Imag4.5 ?Error in I band mag from 4.5'' aperture
143-148 F6.3 mag Jmag4.5 ?Magnitude in J band from 4.5'' aperture
150-154 F5.2 mag e_Jmag4.5 ?Error in J band mag from 4.5'' aperture
156-161 F6.3 mag Kmag4.5 ?Magnitude in K band from 4.5'' aperture
163-167 F5.2 mag e_Kmag4.5 ?Error in K band mag from 4.5'' aperture
169-174 F6.3 mag Imag3.5 ?Magnitude in I band from 3.5'' aperture
176-179 F4.2 mag e_Imag3.5 ?Error in I band mag from 3.5'' aperture
181-186 F6.3 mag Jmag3.5 ?Magnitude in J band from 3.5'' aperture
188-192 F5.2 mag e_Jmag3.5 ?Error in J band mag from 3.5'' aperture
194-199 F6.3 mag Kmag3.5 ?Magnitude in K band from 3.5'' aperture
201-205 F5.2 mag e_Kmag3.5 ?Error in K band mag from 3.5'' aperture
207-212 F6.3 mag Imag3.5c ?I band Magnitude in 3.5'' corrected aperture
214-217 F4.2 mag e_Imag3.5c ?I band mag error in 3.5'' corrected aperture
219-224 F6.3 mag Jmag3.5c ?J band Magnitude in 3.5'' corrected aperture
226-230 F5.2 mag e_Jmag3.5c ?J band mag error in 3.5'' corrected aperture
232-237 F6.3 mag Kmag3.5c ?K band Magnitude in 3.5'' corrected aperture
239-243 F5.2 mag e_Kmag3.5c ?K band mag error in 3.5'' corrected aperture
245-250 F6.3 mag Imag2.5c ?I band Magnitude in 2.5'' corrected aperture
252-255 F4.2 mag e_Imag2.5c ?I band mag error in 2.5'' corrected aperture
257-262 F6.3 mag Jmag2.5c ?J band Magnitude in 2.5'' corrected aperture
264-268 F5.2 mag e_Jmag2.5c ?J band mag error in 2.5'' corrected aperture
270-275 F6.3 mag Kmag2.5c ?K band Magnitude in 2.5'' corrected aperture
277-281 F5.2 mag e_Kmag2.5c ?K band mag error in 2.5'' corrected aperture
283-288 F6.3 mag Imag1.5c ?I band Magnitude in 1.5'' corrected aperture
290-293 F4.2 mag e_Imag1.5c ?I band mag error in 1.5'' corrected aperture
295-300 F6.3 mag Jmag1.5c ?J band Magnitude in 1.5'' corrected aperture
302-306 F5.2 mag e_Jmag1.5c ?J band mag error in 1.5'' corrected aperture
308-313 F6.3 mag Kmag1.5c ?K band Magnitude in 1.5'' corrected aperture
315-319 F5.2 mag e_Kmag1.5c ?K band mag error in 1.5'' corrected aperture
321-324 F4.1 mag Rmag ?R magnitude of USNOA2.0 nearest match
326-329 F4.1 mag Bmag ?B magnitude of USNOA2.0 nearest match
331-333 I3 --- q_Imag [0,100]?Quality flag for I band (100=top)
335-337 I3 --- q_Jmag [0,100]?Quality flag for J band (100=top)
339-341 I3 --- q_Kmag [0,100]?Quality flag for K band (100=top)
343-344 I2 % Ipsf [0,100]?Correlation to PSF for I band (4)
346-347 I2 % Jpsf [0,100]?Correlation to PSF for J band (4)
349-350 I2 % Kpsf [0,100]?Correlation to PSF for K band (4)
352-355 F4.2 --- IMpsf [0,1]?Mean correlation to PSF in I band (4)
357-360 F4.2 --- JMpsf [0,1]?Mean correlation to PSF in J band (4)
362-365 F4.2 --- KMpsf [0,1]?Mean correlation to PSF in K band (4)
367-371 F5.1 pix Ix ?Pixel x position in I band
373-377 F5.1 pix Iy ?Pixel y position in I band
379-383 F5.1 pix Jx ?Pixel x position in J band
385-389 F5.1 pix Jy ?Pixel y position in J band
391-395 F5.1 pix Kx ?Pixel x position in K band
397-401 F5.1 pix Ky ?Pixel y position in K band
403-412 F10.6 deg A2RAdeg ?Right Ascension of USNOA2.0 nearest match
414-423 F10.6 deg A2DEdeg ?Declination of USNOA2.0 nearest match
425-432 F8.3 yr A2Ep ?Epoch of USNOA2.0 nearest match
434-437 I4 mas Dist ?Distance to USNOA2.0 nearest match
439-452 F14.6 d ObsJD Julian day for DENIS observation
454-457 A4 --- Iflg ?Image and source flag in I band (2)
459-462 A4 --- Jflg ?Image and source flag in J band (2)
464-467 A4 --- Kflg ?Image and source flag in K band (2)
469-469 I1 --- mult ?Multiplicity flag (3)
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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.
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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"
* 28-Jan-2025: format migration (CDS)
References:
The DENIS Consortium (April 2003)
(End) Nicolas Epchtein [OCA], Sebastien Derriere [CDS] 07-Apr-2003