J/ApJ/867/105 ATLAS all-sky stellar ref. catalog, ATLAS-REFCAT2 (Tonry+, 2018)
The ATLAS all-sky stellar reference catalog.
Tonry J.L., Denneau L., Flewelling H., Heinze A.N., Onken C.A.,
Smartt S.J., Stalder B., Weiland H.J., Wolf C.
<Astrophys. J., 867, 105-105 (2018)>
=2018ApJ...867..105T 2018ApJ...867..105T (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Photometry ; Optical ; Parallaxes, trigonometric ;
Proper motions
Keywords: atmospheric effects - instrumentation - photometers - surveys -
techniques: photometric
Abstract:
The Asteroid Terrestrial-impact Last Alert System (ATLAS) observes
most of the sky every night in search of dangerous asteroids. Its data
are also used to search for photometric variability, where sensitivity
to variability is limited by photometric accuracy. Since each exposure
spans 7.6° corner to corner, variations in atmospheric
transparency in excess of 0.01mag are common, and 0.01mag photometry
cannot be achieved by using a constant flat-field calibration image.
We therefore have assembled an all-sky reference catalog of
approximately one billion stars to m∼19 from a variety of
sources to calibrate each exposure's astrometry and photometry. Gaia
DR2 is the source of astrometry for this ATLAS Refcat2. The sources of
g, r, i, and z photometry include Pan-STARRS DR1, the ATLAS Pathfinder
photometry project, ATLAS reflattened APASS data, SkyMapper DR1, APASS
DR9, the Tycho-2 catalog, and the Yale Bright Star Catalog. We have
attempted to make this catalog at least 99% complete to m<19,
including the brightest stars in the sky. We believe that the
systematic errors are no larger than 5mmag rms, although errors are
as large as 20mmag in small patches near the Galactic plane.
Description:
We have produced an all-sky astrometric and photometric reference
catalog (Refcat2) to meet the needs of the ATLAS project: all-sky
uniformity, accuracy, and completeness for 6<m<19, including the
Galactic plane.
We have merged data from the three publicly released star catalogs of
Gaia, Pan-STARRS, and SkyMapper. We supplemented this with new ATLAS
Pathfinder survey data, and we reprocessed APASS images in the
southern sky to improve photometric uniformity and fidelity. Addition
of bright stars from Tycho-2 and the Yale BSC filled in the brightest
stars that affect observations even when saturated and that are
required by small-aperture, very wide-field instruments. We have also
added 2MASS near-infrared JHK magnitudes for each object, when they
exist, to remove the need for a user to do an extra catalog
cross-match.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
refcat2.sam 275 1000 ATLAS all-sky stellar reference catalog,
ATLAS-REFCAT2
refcat.c 289 1281 *Programme
refcat.man 80 301 Man page of refcat.c
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Note on refcat.c: A program refcat.c with man page refcat.man are provided to
Refcat2 data files and return all the stars within a distance
of a given coordinate.
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016)
II/358 : SkyMapper Southern Sky Survey. DR1.1 (Wolf+, 2018)
https://archive.stsci.edu/prepds/atlas-refcat2 : REFCAT2 Home Page
Byte-by-byte Description of file: refcat2.sam
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Bytes Format Units Label Explanations
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1- 12 F12.8 deg RAdeg Right ascension from Gaia DR2 (ICRS),
epoch 2015.5 (RA)
14- 25 F12.8 deg DEdeg Declination from Gaia DR2 (ICRS),
epoch 2015.5 (Dec)
27- 34 F8.2 mas Plx ?=0 Parallax from Gaia DR2 (plx)
36- 39 F4.2 mas e_Plx ?=0 Parallax uncertainty (dplx)
41- 48 F8.2 mas/yr pmRA ?=0 Proper motion in right ascension from
Gaia DR2 (pmra)
50- 53 F4.2 mas/yr e_pmRA ?=0 Proper-motion uncertainty in right
ascension (dpmra)
55- 62 F8.2 mas/yr pmDE ?=0 Proper motion in declination from Gaia
DR2 (pmdec)
64- 67 F4.2 mas/yr e_pmDE ?=0 Proper-motion uncertainty in declination
(dpmdec)
69- 74 F6.3 mag Gmag ?=0 Gaia DR2 G magnitude (Gaia)
76- 80 F5.3 mag e_Gmag ?=0 Gaia DR2 G-magnitude uncertainty (dGaia)
82- 87 F6.3 mag BPmag ?=0 Gaia GBP magnitude (BP)
89- 95 F7.3 mag e_BPmag ?=0 Gaia GBP-magnitude uncertainty (dBP)
97-102 F6.3 mag RPmag ?=0 Gaia GRP magnitude (RP)
104-109 F6.3 mag e_RPmag ?=0 Gaia GRP-magnitude uncertainty (dRP)
111-114 I4 K Teff ?=0 Gaia stellar effective temperature (Teff)
116-120 F5.3 mag AG ?=0 Gaia estimate of G-band extinction for
this star (AGaia)
122 I1 --- dupvar Gaia flags (dupvar) (1)
124-130 F7.3 mag Ag ?=0 Schlegel, Finkbeiner & Davis
(1998ApJ...500..525S 1998ApJ...500..525S) estimate of total
column g-band extinction (Ag)
132-135 F4.1 arcsec rp1 Radius where cumulative G flux exceeds
0.1 x this star (rp1) (2)
137-140 F4.1 arcsec r1 Radius where cumulative G flux exceeds
1 x this star (r1) (2)
142-145 F4.1 arcsec r10 Radius where cumulative G flux exceeds
10 x this star (r10) (2)
147-152 F6.3 mag gmag Pan-STARRS gP1 magnitude (g)
154-158 F5.3 mag e_gmag Pan-STARRS gP1-magnitude uncertainty (dg)
160-164 F5.2 --- gchi chi2/dof for contributors to g (gchi)
166-167 A2 --- gcontrib Bitmap of contributing catalogs to g
(gcontrib) (3)
169-174 F6.3 mag rmag Pan-STARRS rP1 magnitude (r)
176-180 F5.3 mag e_rmag Pan-STARRS rP1-magnitude uncertainty (dr)
182-186 F5.2 --- rchi chi2/dof for contributors to r (rchi)
188-189 A2 --- rcontrib Bitmap of contributing catalogs to r
(rcontrib) (3)
191-196 F6.3 mag imag Pan-STARRS iP1 magnitude (i)
198-202 F5.3 mag e_imag Pan-STARRS iP1-magnitude uncertainty (di)
204-208 F5.2 --- ichi chi2/dof for contributors to i (ichi)
210-211 A2 --- icontrib Bitmap of contributing catalogs to i
(icontrib) (3)
213-218 F6.3 mag zmag Pan-STARRS zP1 magnitude (z)
220-224 F5.3 mag e_zmag Pan-STARRS zP1-magnitude uncertainty (dz)
226-230 F5.2 --- zchi chi2/dof for contributors to z (zchi)
232-233 A2 --- zcontrib Bitmap of contributing catalogs to z
(zcontrib) (3)
235-236 I2 --- nstat Count of griz deweighted outliers (nstat)
238-243 F6.3 mag Jmag ?=0 2MASS J magnitude (J)
245-249 F5.3 mag e_Jmag ?=0 J-magnitude uncertainty (dJ)
251-256 F6.3 mag Hmag ?=0 2MASS H magnitude (H)
258-262 F5.3 mag e_Hmag ?=0 2MASS H-magnitude uncertainty (dH)
264-269 F6.3 mag Kmag ?=0 2MASS K magnitude (K)
271-275 F5.3 mag e_Kmag ?=0 2MASS K-magnitude uncertainty (dK)
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Note (1): Gaia flags as follows:
0 = CONSTANT
1 = VARIABLE
2 = NOT_AVAILABLE
5 = DUPLICATE
6 = DUPLICATE
Note (2): These are given the value 99.9 when a star is so isolated that the
cumulative flux never reaches the threshold within the 36'' search radius.
Note (3): The griz-contrib entries identify contributors to the griz magnitudes.
Bits 0-7 are set when a catalog contributes to the statistical average with
a magnitude uncertainty less than 0.2: Gaia DR2 (bit 0),
GMP (bit 1) (Gaia and 2MASS magnitudes), Pan-STARRS (bit 2),
SkyMapper (bit 3), Pathfinder (bit 4), APASS (bit 5), APASS DR9 (bit 6),
and Tycho-2/BSC (bit 7).
For example, the code rcontrib = 06 implies that r contributions with an
uncertainty less than 0.2mag came from GMP and Pan-STARRS.
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Acknowledgements:
John Tonry, tonry(at)hawaii.edu
(End) Francois-Xavier Pineau, Patricia Vannier [CDS] 17-Mar-2021