I/319 XPM Catalog of positions and proper motions (Fedorov+ 2011)
XPM Catalog of positions and proper motions of stars
Fedorov P., Myznikov A., Akhmetov V.
<Mon. Not. R. Astron. Soc. 393, 133 (2009); 416, 403 (2011)>
=2011MNRAS.416..403F 2011MNRAS.416..403F
+2009MNRAS.393..133F 2009MNRAS.393..133F
=2011yCat.1319....0F 2011yCat.1319....0F
ADC_Keywords: Positional data ; Proper motions
Keywords: catalogues - astrometry - reference systems
Abstract:
We combined data from the Two-Micron All Sky Survey (2MASS) and
USNO-A2.0 catalogues in order to derive the absolute proper motions of
about 280 million stars distributed all over the sky excluding a small
region near the Galactic Centre, in the magnitude range 12<B<19mag.
The proper motions were derived from the 2MASS Point Sources and
USNO-A2.0 catalogue positions with a mean epoch difference of about 45
years for the Northern hemisphere and about 17 years for the Southern
one. The zero-point of the absolute proper motion frame (the 'absolute
calibration') was specified with the use of about 1.45 million
galaxies from 2MASS. Most of the systematic zonal errors inherent in
the USNO-A2.0 catalogue were eliminated before the calculation of
proper motions. The mean formal error of absolute calibration is less
than 1mas/yr.
Description:
The final version of the XPM catalogue contains about 314million
stellar positions and absolute proper motions and covers the whole
celestial sphere without gaps in the magnitude range 10<B<22mag.
The general procedural steps were followed as for
XPM, but some of these were performed on a more sophisticated level.
The XPM-1.0 catalogue contains the star positions, the proper motions
and the Two-Micron All-Sky Survey (2MASS, Cat. II/246) and United
States Naval Observatory (USNO, Cat. I/252 + I/284 + I/315) photometry.
The analysis of stellar positions and proper motions of the XPM
catalogue, were shown to have an ambiguity of rotation relative to the
LQAC quasars and ICRF2 sources less than 0.2mas/yr. It is concluded
that the XPM catalogue is the independent realization of the ICRS in
the optical and near infrared wavelengths in the sense of obtaining of
proper motions. The absolute proper motions of XPM stars were compared
with the similar data from the HCRF (Hipparcos Celestial Reference
Frame) modern catalogues. The proper motions of stars in these
catalogues were shown to have the appreciable random and systematic
errors.
The random errors are estimated to be ≲60mas in RA/Dec for the stars
fainter than B=12mag, and the random errors of absolute proper motions
are slightly different for the northern and southern hemispheres:
3-8mas/yr for the North and 5-10mas/yr for the South.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
xpm.sam 188 1000 Sample of formatted catalog
(on a total of 313,610,083 sources)
tsv/* . 360 Tab-separated-files ascii XPM catalog, organised in
360x0.5deg declination zones (South to North)
--------------------------------------------------------------------------------
See also:
I/252 : The USNO-A2.0 Catalogue (Monet+ 1998)
I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)
I/320 : SPM 4.0 Catalog (Girard+, 2011)
I/323 : International Celestial Reference Frame 2, ICRF2 (Ma+, 2009)
I/305 : The Guide Star Catalog, Version 2.3.2 (GSC2.3) (STScI, 2006)
II/246 : 2MASS All-Sky Catalog of Point Sources [PSC] (Cutri+ 2003)
VII/233 : The 2MASS Extended sources [XSC] (IPAC/UMass, 2003-2006)
J/A+A/494/799 : Large Quasar Astrometric Catalogue (LQAC) (Souchay+, 2009)
J/A+A/537/A99 : Large Quasar Astrometric Catalogue 2 (LQAC-2) (Souchay+, 2012)
Byte-by-byte Description of file (#) : xpm.sam
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 A15 --- ID XPM ID (ZZZ-NNNNNNN) (4)
17- 26 F10.6 deg RAdeg Right Ascension (ICRS, epoch 2000.0) (RA) (5)
28- 37 F10.6 deg DEdeg Declination (ICRS, epoch 2000.0) (DEC) (5)
39- 47 F9.2 mas/yr pmRAp Proper Motion in RA with PSC (MuRAp) (1)
49- 57 F9.2 mas/yr pmDEp Proper Motion in DEC with PSC (MuDEp) (1)
59- 67 F9.2 mas/yr pmRAx Proper Motion in RA with XSC (MuRAx) (1)
69- 77 F9.2 mas/yr pmDEx Proper Motion in DEC with XSC (MuDEx) (1)
79- 84 F6.3 mag Fmag ?=0 Red magnitude from GSC2.3 (I/305)
86- 91 F6.3 mag Bjmag ?=0 Blue magnitude from GSC2.3 (I/305) (Jmag)
93- 98 F6.3 mag Vmag ?=0 Visual magnitude from GSC2.3 (I/305)
100-105 F6.3 mag Nmag ?=0 Near-IR magnitude from GSC2.3 (I/305)
107-112 F6.3 mag Jmag ?=0 2MASS J magnitude (II/246) (j_m)
114-119 F6.3 mag e_Jmag ?=0 Standard error in J magnitude (er_jmag)
121-126 F6.3 mag Hmag ?=0 2MASS H magnitude (II/246) (h_m)
128-133 F6.3 mag e_Hmag ?=0 Standard error in H magnitude (er_hmag)
135-140 F6.3 mag Kmag ?=0 2MASS Ks magnitude (II/246) (k_m)
142-147 F6.3 mag e_Kmag ?=0 Standard error in Ks magnitude (er_kmag)
149-158 I10 -- 2Mkey Unique 2MASS source identifier (pts_key)
160-163 F4.1 mag Bmag Magnitude from USNO-A2.0 blue plate (Bmag_ua)
165-168 F4.1 mag Rmag Magnitude from USNO-A2.0 red plate (Rmag_ua)
170-173 I4 -- Fld POSS field number (field) (2)
175-183 F9.6 yr dT Epoch difference between 2MASS and USNO-A2.0
185 I1 --- fg [0/1] quasi-absolute calibration (good_gal) (3)
186 I1 --- fs [0/1] calibration from XSC (gal_star) (3)
--------------------------------------------------------------------------------
Note (1): the proper motions pmRAp and pmDEp use the zero-point derived
from the PSC coordinates of extended sources (II/246), while pmRAx and
pmDEx use the zero-point derived from the XSC coordinates of extended
sources (VII/233). The random errors of absolute proper motions of the XPM
stars depends on stellar magnitude and are slightly different for the
Northern and Southern hemispheres and equal 3-8 mas/yr and 5-10 mas/yr,
respectively, whereas the formal error of the absolute calibration is
about 0.3 mas/yr in the Northern hemisphere, and about 1 mas/yr in the
Southern one.
Note (2): In the north, we adopted the MLP numbers for POSS-I (see VI/25).
These start at 1 at the north pole (1 and 2 are degenerate) and end
at 825 in the -20 degree zone. Note that fields 723 and 724 are
degenerate, and we measured but omitted 723 in favor of 724 which
corresponds to the print in the paper POSS-I atlas. In the south,
the fields start at 1 at the south pole and the -20 zone ends at 606
(see VI/114)
Note (3): flags are:
* "good_gal" flag is =0 when the proper motion was derived using a
quasi-absolute calibration.
* "gal_star" flag is =1 when the extended source was used for
absolute calibration
Note (4): the XPM identification is made from the zone number (000 to 359
from South Pole northward, each zone being 0.5deg wide) and the
sequential number in the zone (7 digits)
Note (5): The epoch for the positions of all stars is J2000.0. Positions
in the XPM are referred to the HCRF as the stars from the USNO-A2.0 and
2MASS catalogues are given in this system. The formal random error of
stellar positions makes from 70 to 150 mas, depending on a specific plate
and stellar magnitude.
--------------------------------------------------------------------------------
Acknowledgements:
All files were kindly supplied by Peter Fedorov
(End) Francois Ochsenbein, Pierre Ocvirk [CDS] 27-Oct-2015