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J/AJ/126/472        High proper motion stars in USNO-B     (Gould, 2003)

Completeness of USNO-B for high proper motion stars. Gould A. <Astron. J. 126, 472 (2003)> =2003AJ....126..472G
ADC_Keywords: Proper motions Keywords: astrometry - methods: statistical Abstract: The completeness of USNO-B detections of high proper motion (µ>180mas/yr) stars is tested, and the accuracy of its measurements is compared to the revised New Luyten Two-Tenths catalog of Salim & Gould (2002ApJ...575L..83S). For 14.5<V<18.5, only 6% of such stars are missing from USNO-B (Cat. I/284), while another 3% have large errors, mostly too large to be useful. Including both classes, incompleteness is 9%. These fractions rise toward both brighter and fainter magnitudes. Incompleteness rises with proper motion to 30% at µ=1"/yr. It also rises to 35% at the Galactic plane, although this is only determined for relatively bright stars V≲14. For binaries, incompleteness rises from 9% at separations of 30" to 47% at 10". The proper-motion errors reported internally by USNO-B are generally correct. However, there is a value of σµ∼4mas/yr below which the reported errors should not be taken at face value. The small number of stars with relatively large reported errors (σµ≳20mas/yr) may actually have still larger errors than tabulated. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 101 1092 Binary Sample
See also: I/284 : The USNO-B1.0 Catalog (Monet+ 2003) I/98 : NLTT Catalogue (Luyten, 1979) J/ApJ/582/1011 : Revised NLTT Catalog (Salim+, 2003) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 5 I5 --- NLTT The NLTT (Cat. I/98) number 7- 8 I2 --- UCode The USNO-B (Cat. I/284) validity code (1) 10- 18 F9.5 deg RAdeg Right ascension in decimal degrees (J2000) 20- 28 F9.5 deg DEdeg Declination in decimal degrees (J2000) 30- 36 F7.4 arcsec/yr pmRA The revised NLTT (Cat. J/ApJ/582/1011) right ascension proper motion 38- 44 F7.4 arcsec/yr pmDE The revised NLTT declination proper motion 46- 51 F6.3 arcsec/yr pmRAU The USNO-B right ascension proper motion 53- 58 F6.3 arcsec/yr pmDEU The USNO-B declination proper motion 60- 64 F5.2 mag Vmag The revised NLTT V-band magnitude 66- 70 F5.2 mag V-J The revised NLTT (V-J) color 72- 74 I3 --- NCode The revised NLTT source code (2) 76- 81 F6.1 arcsec NSep ? NLTT notes binary separation (3) 83- 87 F5.1 deg NPA ? NLTT notes binary position angle (3) 89- 94 F6.1 arcsec rNSep ? Revised NLTT position binary separation (3) 96-100 F5.1 deg rNPA ? Revised NLTT position binary position angle (3)
Note (1): USNO-B validity code as follows: -1 = Not used 0 = Not in USNO-B 1 = Bad USNO-B proper motion with USNO-B companion 2 = Bad USNO-B proper motion without USNO-B companion 3 = Good USNO-B proper motion Note (2): Revised NLTT source code as follows: 555 = Identified in USNO-A (Cat. I/252) and 2MASS (Cat. II/246) 576 = Identified in 2MASS (Cat. II/246) as an NLTT (Cat. J/ApJ/582/1011) common proper motion companion to another revised NLTT star 566 = Identified in 2MASS (Cat. II/246) only based on the predicted NLTT (Cat. J/ApJ/582/1011) position 222 = Identified in Tycho-2 (Cat. I/259) 121 = Identified in Hipparcos (Cat. I/239) and Tycho-2 (Cat. I/259) 111 = Identified in Hipparcos (Cat. I/239) Note (3): Revised NLTT position binary position angle of second component relative to the first.
History: From electronic version of the journal 23-Aug-2005 : An inversion between pmRA and pmDE for the pairs (line 927 to the end) was corrected.
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 27-Aug-2003
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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