The XPM Catalog of positions and proper motions of stars
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The XPM Catalogue. Absolute proper motions of 280 million stars
Fedorov P., Myznikov A., Akhmetov V.,
< MNRAS, 393, 133, (2009)>
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Keywords: astrometry; reference systems; catalogues; proper motions;
Galaxy: kinematics and dynamics
Description:
We combined the data from 2MASS and USNO-A2.0 catalogues in order to derive
the absolute proper motions of about 314 million stars distributed all over the sky
without gaps in the magnitude range 10m < V <20m . The proper motions were derived
from 2MASS Point Sources and USNO-A2.0 catalogues positions, with the mean epoch
difference of about 45 years for the northern hemisphere, and about 17 years
for the southern one. Most of the systematic zonal errors inherent in the USNO-A2.0
catalogue were eliminated before calculation of the proper motions. The zero-point
of the absolute proper-motion frame (the “absolute calibration”) was specified
with the use of about 1.1 million of extended sources from 2MASS and USNO-A2.0.
In fields covering the zone of avoidance or those that contain fewer than 25 galaxies,
quasi-absolute calibration was performed. The mean formal error of absolute calibration
is less than 1 mas/yr. The generated Catalogue contains the ICRS positions of stars
for the 2000.0 epoch, original absolute proper motions, as well as F, J, V, N magnitudes
from GSC2.3; B, R magnitudes from USNO-A2.0 and J, H, Ks magnitudes from 2MASS.
File Summary:
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FileName Records Explanations
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ReadMe This file
dat/* 360 xpm***.txt files organized by declination zones of 30' and
sort by right ascension.
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See also:
I/252 : The USNO-A2.0 Catalogue (Monet+ 1998)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
I/305 : The Guide Star Catalog, Version 2.3.2 (GSC2.3) (STScI, 2006)
Description of file: *.txt
The files are ASCII, free format with tab separator columns
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Format Units Label Explanations
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F.6 deg RA Right Ascension (ICRS, epoch 2000.0)
F.6 deg DEC Declination (ICRS, epoch 2000.0)
F.2 mas/yr MuRAp* Proper Motion in RA*cos(DEC) (mas/yr)
F.2 mas/yr MuDEp* Proper Motion in DEC (mas/yr)
F.2 mas/yr MuRAx** Proper Motion in RA*cos(DEC) (mas/yr)
F.2 mas/yr MuDEx** Proper Motion in DEC (mas/yr)
F.3 mag Fmag Magnitude from GSC2.3
F.3 mag Jmag Magnitude from GSC2.3
F.3 mag Vmag Magnitude from GSC2.3
F.3 mag Nmag Magnitude from GSC2.3
F.3 mag j_m J magnitude from 2MASS
F.3 mag er_jmag Standard error on J magnitude
F.3 mag h_m H magnitude from 2MASS
F.3 mag er_hmag Standard error on H magnitude
F.3 mag k_m Ks magnitude from 2MASS
F.3 mag er_kmag Standard error on Ks magnitude
I10 --- pts_key Unique source identifier in 2MASS
I3 mag*10 Bmag_ua Magnitude from blue plate USNO-A2.0
I3 mag*10 Rmag_ua Magnitude from red plate USNO-A2.0
I3 --- field USNO-A2.0 field number
F.6 year dT Difference of epochs between 2MASS and USNO-A2.0
bit --- “good_gal” if flag =0, the proper motion was derived using a
quasi-absolute calibration.
bit --- “gal_star” if flag =1, the extended source was used for absolute
calibration
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Note (1):
• *- the zero-point of the proper motion was derived using the PSC coordinates of extended sources
• **- the zero-point of the proper motion was derived using the XSC coordinates of extended sources
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In case of any problems or questions, please contact by e-mail P. N. Fedorov (pnfedorov@gmail.com)
or V. S. Akhmetov (akhmetov@astron.kharkov.ua).
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References:
1. P. N. Fedorov, A. A. Myznikov and V. S. Akhmetov
“The XPM Catalogue: absolute proper motions of 280 million stars ”
Mon. Not. R. Astron. Soc. 393, 133–138 (2009)
2. P. N. Fedorov, V. S. Akhmetov, V. V. Bobylev and A. T. Bajkova
“ An investigation of the absolute proper motions of the XPM catalogue”
Mon. Not. R. Astron. Soc. 406, 1734–1744 (2010)
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