J/ApJS/152/103 Proper-motion catalog SDSS + USNO-B (Gould+, 2004)
Proper-motion catalog from SDSS intersection with USNO-B.
Gould A., Kollmeier J.A.
<Astrophys. J. Suppl. Ser., 152, 103-111 (2004)>
=2004ApJS..152..103G 2004ApJS..152..103G
ADC_Keywords: Stars, late-type ; Combined data ; Proper motions
Keywords: astrometry - catalogs - stars: fundamental parameters -
stars: late-type - subdwarfs - white dwarfs
Abstract:
We present a catalog of ∼390000 stars with proper motions
µ≥20mas/yr and magnitudes r'≤20, drawn from the intersection of
the SDSS Data Release One (see http://www.sdss.org/dr1) and USNO-B
(I/284). We first use SDSS quasars to correct the proper motions in
each of the two source catalogs, finding that these corrections for
systematics are comparable to the statistical errors. The combined
proper motions have errors of σµ=3.9mas/yr, significantly
better than any previous catalog at these magnitudes. While
cross-correlating SDSS and USNO-B removes the vast majority of the
very large number of spurious proper-motion stars in each, some
contamination remains, especially at faint magnitudes, r'≳19.5, and
high proper motions. We present a diagrammatic method to estimate the
level of contamination in selected subsets of the catalog, which
should be useful for choosing appropriate selection criteria for
various applications.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 164 390476 SDSS / USNO-B Proper Motions
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See also:
I/284 : The USNO-B1.0 Catalog (Monet+ 2003)
J/AJ/126/2579 : SDSS quasar catalog. II. First data release (Schneider+, 2003)
http://www.sdss.org/dr1 : SDSS Data Release 1 Home Page
http://www.astronomy.ohio-state.edu/~gould/SDSS-USNOB/cat.dat.gz : latest
version of the catalog
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg SDSS Right Ascension (decimal degrees, J2000) (8)
11- 19 F9.5 deg DEdeg SDSS Declination (decimal degrees, J2000) (8)
21- 29 F9.5 deg RAUdeg USNO-B Right Ascension (decimal degrees, J2000) (8)
31- 39 F9.5 deg DEUdeg USNO-B Declination (decimal degrees, J2000) (8)
41- 46 F6.1 mas/yr pmSRA East component of corrected SDSS proper motion (1)
48- 53 F6.1 mas/yr pmSDE North component of corrected SDSS proper motion (1)
55- 60 F6.1 mas/yr pmURA East component of corrected USNO-B proper motion
62- 67 F6.1 mas/yr pmUDE North component of corrected USNO-B proper motion
69- 74 F6.1 mas/yr pmRA Weighted average east component of
proper motion (2)
76- 81 F6.1 mas/yr pmDE Weighted average north component of
proper motion (2)
83- 88 F6.1 mas/yr pm Scalar (total) proper motion (3)
90- 95 F6.3 mag u'mag SDSS u' band PSF magnitude
97-102 F6.3 mag g'mag SDSS g' band PSF magnitude
104-109 F6.3 mag r'mag SDSS r' band PSF magnitude
111-116 F6.3 mag i'mag SDSS i' band PSF magnitude
118-123 F6.3 mag z'mag SDSS z' band PSF magnitude
125-128 F4.1 mag Bmag Associated SDSS star's USNO-A blue magnitude
130-133 F4.1 mag Rmag ?=50.0 Associated SDSS star's USNO-A red magnitude
135-140 F6.3 mag Hr' Unadjusted r' band reduced proper motion (4)
142-147 F6.3 mag aHr' Adjusted r' band reduced proper motion (5)
149-152 F4.1 --- wS Total statistical weights of SDSS quasars (6)
154-157 F4.1 --- wU Total statistical weights of USNO-B quasars (6)
159-164 F6.2 --- Chi2 Internal-error indicator (7)
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Note (1): As described by equations 1 and 4 in paper.
Note (2): As described by equation A5 in paper.
The average error is 3.9mas/yr.
Note (3): The root-sum-square of pmE and pmN.
Note (4): Hr' = r'mag + 5log(pm/(1"/yr))
Note (5): aHr' = r'mag + 5log(pm/(1"/yr)) -1.47|sinb|,
where b is the Galactic latitude.
Note (6): Used in the local proper-motion correction. See equation 1 in paper.
Note (7): As described by equation A3 in paper.
Note (8): The epoch of the position is J2000 in USNO-B, and the date of
observation (around J2000) for SDSS.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 07-May-2004