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I/343          Gaia-PS1-SDSS (GPS1) proper motion catalog          (Tian+, 2017)

A Gaia-PS1-SDSS (GPS1) proper motion catalog covering 3/4 of the sky. Tian H.-J., Gupta P., Sesar B., Rix H.-W., Martin N.F., Liu C., Goldman B., Platais I., Kudritzki R.-P., Waters C.Z. <Astrophys. J. Suppl. Ser., 232, 4-4 (2017)> =2017ApJS..232....4T (SIMBAD/NED BibCode)
ADC_Keywords: Proper motions ; Photometry, ugriz ; Photometry, infrared ; Positional data ; Surveys Keywords: astrometry; catalogs; Galaxy: kinematics and dynamics; proper motions Abstract: We combine Gaia DR1, PS1, Sloan Digital Sky Survey (SDSS), and 2MASS astrometry to measure proper motions for 350 million sources across three-fourths of the sky down to a magnitude of mr∼20. Using positions of galaxies from PS1, we build a common reference frame for the multi-epoch PS1, single-epoch SDSS and 2MASS data, and calibrate the data in small angular patches to this frame. As the Gaia DR1 excludes resolved galaxy images, we choose a different approach to calibrate its positions to this reference frame: we exploit the fact that the proper motions of stars in these patches are linear. By simultaneously fitting the positions of stars at different epochs of-Gaia DR1, PS1, SDSS, and 2MASS-we construct an extensive catalog of proper motions dubbed GPS1. GPS1 has a characteristic systematic error of less than 0.3mas/yr and a typical precision of 1.5-2.0mas/yr. The proper motions have been validated using galaxies, open clusters, distant giant stars, and QSOs. In comparison with other published faint proper motion catalogs, GPS1's systematic error (<0.3mas/yr) should be nearly an order of magnitude better than that of PPMXL and UCAC4 (>2.0mas/yr). Similarly, its precision (∼1.5mas/yr) is a four-fold improvement relative to PPMXL and UCAC4 (∼6.0mas/yr). For QSOs, the precision of GPS1 is found to be worse (∼2.0-3.0mas/yr), possibly due to their particular differential chromatic refraction. Description: In order to construct proper motions, we analyze and model catalog positions from four different imaging surveys, as discussed below. Gaia DR1 is based on observations collected between 2014 July 25 and 2015 September 16. PS1 observations were collected between 2010 and 2014. The SDSS DR9 data used here were obtained in the years between 2000 and 2008. The images from 2MASS were taken between 1997 and 2001. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file gps1.sam 481 1000 Gaia-PS1-SDSS (GPS1) proper motion catalog, sample output (on a total of 345,274,875 sources)
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) I/312 : PPMX Catalog of positions and proper motions (Roeser+ 2008) I/317 : The PPMXL Catalog (Roeser+ 2010) I/324 : The Initial Gaia Source List (IGSL) (Smart, 2013) I/337 : Gaia DR1 (Gaia Collaboration, 2016) V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012) II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016) J/AJ/127/3034 : Proper-motion catalog combining USNO-B and SDSS (Munn+, 2004) J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012) http://dc.zah.uni-heidelberg.de/gps1/q/cone/info : The GPS1 catalog on GAVO Byte-by-byte Description of file: gps1.sam
Bytes Format Units Label Explanations
1- 13 F13.9 deg RAdeg Right ascension from fit (ICRS, Epoch 2010) (1) 15- 27 F13.9 deg DEdeg Declination from fit (ICRS, Epoch 2010) (1) 29- 48 I20 --- objid Object identifier (not unique; this is not the Pan-STARRS1 identifier) (2) 50- 55 F6.3 mas e_RA [0.01/100]? Error in RA from Gaia DR1 (1) 57- 62 F6.3 mas e_DEC [0.02/100]? Error in DEC from Gaia DR1 (1) 64- 76 F13.9 deg RAPdeg Right Ascension from Pan-STARRS1 78- 90 F13.9 deg DEPdeg Declination from Pan-STARRS1 92-104 F13.3 mas/yr pmRA Proper motion in RA with cos(δ) applied; robust fit 106-116 F11.3 mas/yr e_pmRA [0.006/4865976] Error of proper motion in RA, cos(δ) applied; robust fit (3) 118-127 F10.3 mas/yr pmDE Proper motion in Declination; robust fit 129-140 F12.3 mas/yr e_pmDE Error of proper motion in Declination; robust fit (3) 142-154 F13.3 mas/yr pmRAx Proper motion in RA with cos(δ) applied; x-validation fit 156-166 F11.3 mas/yr e_pmRAx [0.1/4865976]? Error of proper motion in RA, cos(δ) applied; x-validation fit (3) 168-177 F10.3 mas/yr pmDEx Proper motion in Declination; x-validation fit 179-190 F12.3 mas/yr e_pmDEx ? Error of proper motion in Declination; x-validation fit (3) 192-204 F13.3 mas/yr pmRAng Proper motion in RA with cos(δ) applied; fit without Gaia 206-217 F12.3 mas/yr e_pmRAng ? Error of proper motion in RA, cos(δ) applied; fit without Gaia (3) 219-229 F11.3 mas/yr pmDEng [-185001/30992] Proper motion in DEC; fit without Gaia 231-242 F12.3 mas/yr e_pmDEng ? Error of proper motion in Declination; fit without Gaia (3) 244-256 F13.3 mas/yr pmRAps Proper motion in RA with cos(δ) applied; fit with only Pan-STARRS 258-269 F12.3 mas/yr e_pmRAps ? Error of proper motion in RA, cos(δ) applied; fit with only Pan-STARRS (3) 271-280 F10.3 mas/yr pmDEps [-85810/11545] Proper motion in Declination; fit with only Pan-STARRS 282-293 F12.3 mas/yr e_pmDEps Error of proper motion in Declination; fit with only Pan-STARRS (3) 295-303 E9.3 --- chi2pmRA Reduced Χ2 for the robust fit of proper motion in RA 305-313 E9.3 --- chi2pmDE Reduced Χ2 for the robust fit of proper motion in DEC 315-323 E9.3 --- chi2pmRAps Reduced Χ2 for the Pan-STARRS 1-only fit of proper motion in RA 325-333 E9.3 --- chi2pmDEps Reduced Χ2 for the Pan-STARRS 1-only fit of proper motion in DEC 335-341 F7.3 mag gmag [-33/32]? g-band PSF magnitude from PAN-STARRS1/PS1 DR1 (4) 343-349 F7.3 mag e_gmag [0/197]? gmag uncertainty 351-356 F6.3 mag rmag [-5/29]? r-band PSF magnitude from PAN-STARRS1/PS1 DR1 (4) 358-363 F6.3 mag e_rmag [0/85]? rmag uncertainty 365-370 F6.3 mag imag [-3/30]? i-band PSF magnitude from PAN-STARRS1/PS1 DR1 (4) 372-377 F6.3 mag e_imag [0/77]? imag uncertainty 379-384 F6.3 mag zmag [-0.1/29]? z-band PSF magnitude from PAN-STARRS1/PS1 DR1 (4) 386-392 F7.3 mag e_zmag [0/151]? zmag uncertainty 394-399 F6.3 mag ymag [-5/27]? y-band PSF magnitude from PAN-STARRS1/PS1 DR1 (4) 401-407 F7.3 mag e_ymag [0/253]? ymag uncertainty 409-414 F6.3 mag Jmag [0/26]? J-band magnitude from 2MASS (4) 416-420 F5.3 mag e_Jmag [0/10]? Jmag uncertainty 422-427 F6.3 mag Hmag [0/25]? H-band magnitude from 2MASS (4) 429-433 F5.3 mag e_Hmag [0/10]? Hmag uncertainty 435-440 F6.3 mag Ksmag [0/21]? Ks-band magnitude from 2MASS (4) 442-446 F5.3 mag e_Ksmag [0/10]? Ksmag uncertainty 448-453 F6.3 mag Gmag [9.7/26.3]? G-band magnitude from Gaia (4) 455-460 F6.4 mag e_Gmag [0.0001/0.5]? Gmag uncertainty 462-463 I2 --- N(PS1) [3/15] Number of PS1 SeasonAVG detections 465-466 I2 --- Nobs [3/16] Number of all the detections 468-469 I2 --- Surveys [0/35] Sum of source codes for the source catalogues that went into this row (5) 471-475 F5.3 arcsec d(PS1) [0/2] Distance between position in GPS1 and the associated (closest) position in Pan-STARRS1 used for (not accounting for the epoch difference) 477-481 F5.3 arcsec d(G) [0/3] Distance between position in GPS1 and the associated (closest) position in Gaia DR1 (not accounting for the epoch difference)
Note (1): The positions are SeasonAVGs from Pan-STARRS1 if unavailable from Gaia DR1. The errors are NULL in these cases. Note (2): Different items share the same objID, however they are very likely the same object. Note (3): Note that some values are very large; mostly for sources located at the Celestial Pole. Objects with errors larger than 1000mas/yr should be removed. Note (4): Pan-STARRS1, 2MASS, and Gaia photometry was re-added to the objects via a blind crossmatch; it does not necessarily correspond to the photometry of the objects that were used to derive the astrometry, in particular in crowded fields. Note (5): Pan-STARRS1 is always present (= 0). Source codes: 5 = 2MASS; 10 = SDSS, 20 = Gaia.
Acknowledgements: Markus Demleitner [GAVO] for his help to recover the data; Bertrand Goldman [Max Planck Institute for Astronomy] for his help to describe the data. History: VO resource provided by the GAVO Data Center
(End) Thomas Boch, Emmanuelle Perret [CDS] 06-Feb-2018
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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