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I/341               PMA Catalogue                            (Akhmetov+, 2017)

The PMA Catalogue: 420 million positions and absolute proper motions. Akhmetov V.S., Fedorov P.N., Velichko A.B., Shulga V.M. <Mon. Not. R. Astron. Soc. 469, 763 (2017)> =2017MNRAS.469..763A (SIMBAD/NED BibCode) =2017yCat.1341....0A
ADC_Keywords: Positional data ; Proper motions Keywords: catalogues - astrometry - proper motions - reference systems - Galaxy: kinematics and dynamics Abstract: We present a catalogue that contains about 420 million absolute proper motions of stars. It was derived from the combination of positions from Gaia DR1 and 2MASS, with a mean difference of epochs of about 15yr. Most of the systematic zonal errors inherent in the 2MASS Catalogue were eliminated before deriving the absolute proper motions. The absolute calibration procedure (zero-pointing of the proper motions) was carried out using about 1.6 million positions of extragalactic sources. The mean formal error of the absolute calibration is less than 0.35mas/yr. The derived proper motions cover the whole celestial sphere without gaps for a range of stellar magnitudes from 8 to 21mag. In the sky areas where the extragalactic sources are invisible (the avoidance zone), a dedicated procedure was used that transforms the relative proper motions into absolute ones. The rms error of proper motions depends on stellar magnitude and ranges from 2-5mas/yr for stars with 10mag<G<17mag to 5-10mas/yr for faint ones. The present catalogue contains the Gaia DR1 positions of stars for the J2015 epoch. The system of the PMA proper motions does not depend on the systematic errors of the 2MASS positions, and in the range from 14 to 21mag represents an independent realization of a quasi-inertial reference frame in the optical and near-infrared wavelength range. The Catalogue also contains stellar magnitudes taken from the Gaia DR1 and 2MASS catalogues. A comparison of the PMA proper motions of stars with similar data from certain recent catalogues has been undertaken. Description: The idea for creating the catalogue is very simple. The PMA catalogue has been derived from a combination of two catalogues, namely 2MASS and Gaia DR1. The difference of epochs of observations for these catalogues is approximately 15 yr. The positions of objects in the Gaia DR1 catalogue are referred to the reference frame, which is consistent with ICRF to better than 0.1 mas for the J2015.0 epoch. The positions of objects in 2MASS are referred to HCRF, which, as was shown in Kovalevsky et al. (1997A&A...323..620K), is aligned with the ICRF to within ±0.6 mas at the epoch 1991.25 and is non-rotating with respect to distant extragalactic objects to within ±0.25mas/yr. By comparing the positions of the common objects contained in the catalogues, it is possible to determine their proper motions within their common range of stellar magnitudes by dividing differences of positions over the time interval between their observations. Formally, proper motions derived in such a way are given in the ICRF system, because the positions of both Gaia DR1 stars and those of 2MASS objects (through Hipparcos/Tycho-2 stars) are given in the ICRF and cover the whole sphere without gaps. We designate them further in this paper as relative, with the aim of discriminating them from absolute ones, which refer to the reference frame defined by the positions of about 1.6 million galaxies from Gaia DR1. There is no possibility of obtaining estimates of individual errors of proper motions of stars for the PMA Catalogue from the intrinsic convergence, because the direct errors for positions are not indicated in 2MASS. Therefore we use some indirect methods to obtain the estimates of uncertainties for proper motions. After elimination of the systematic errors, the root-mean-squared deviation of the coordinate differences of extended sources is about 200mas, and the mean number of galaxies inside each pixel is about 1300, so we expect the error of the absolute calibration to be 0.35mas/yr. We compared the proper motions of common objects from PMA and from the TGAS and UCAC4 catalogues. Knowing the mean-square errors of (PMA-TGAS) and (PMA-UCAC4) proper motion differences in each pixel, the appropriate errors in PMA vary from 2 to 10mas/yr, depending on magnitude, which are consistent with the errors calculated above. In case of any problems or questions, please contact by e-mail V.S. Akhmetov (akhmetovvs(at)gmail.com or akhmetov(at)astron.kharkov.ua). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file pma/* 112 360 *PMA Catalogue
Note on pma/*: pma???.dat (pma000.dat to pma359.dat) ascii PMA catalog, organized by declination zones of 30' and sort by right ascension.
See also: I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) I/337 : Gaia DR1 (Gaia Collaboration, 2016) I/339 : Hot Stuff for One Year (HSOY) (Altmann+, 2017) I/340 : UCAC5 Catalogue (Zacharias+ 2017) Byte-by-byte Description of file: pma/*
Bytes Format Units Label Explanations
1- 13 F13.9 deg RAdeg Right ascension (ICRS, epoch 2015.0) from GAIA DR1 (RA) 15- 27 F13.9 deg DEdeg Declination (ICRS, epoch 2015.0) from GAIA DR1 (DEC) 29- 33 F5.2 mas e_RAdeg Standard error of right ascension from GAIA DR1 (eRA) 35- 39 F5.2 mas e_DEdeg Standard error of declination from GAIA DR1 (eDEC) 41- 47 F7.2 mas/yr pmRA Proper motion in right ascension (pmRAcosDE) (pmRA) 49- 55 F7.2 mas/yr pmDE Proper motion in declination (pmDE) 57- 62 F6.3 mag Gmag G-band mean magnitude from GAIA DR1 (Gmag) 64- 69 F6.3 mag Jmag J magnitude from 2MASS (j_mag) 71- 75 F5.3 mag e_Jmag Standard error in J magnitude (er_jmag) 77- 82 F6.3 mag Hmag H magnitude from 2MASS (h_mag) 84- 88 F5.3 mag e_Hmag Standard error in J magnitude (re_hmag) 90- 95 F6.3 mag Kmag Ks magnitude from 2MASS (k_mag) 97-101 F5.3 mag e_Kmag Standard error in J magnitude (er_kmang) 103-112 A10 --- Cntr Unique source identifier in 2MASS (pts_key)
Acknowledgements: V. S. Akhmetov, akhmetovvs(at)gmail.com or akhmetov(at)astron.kharkov.ua
(End) Patricia Vannier [CDS] 28-Jun-2017
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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