Revised NLTT Catalog


Improved Astrometry and Photometry for the New Luyten Catalogue of Stars With Proper Motions Larger than Two Tenths of an Arcsecond (NLTT)
 

The gzipped catalog is available here
 

Description:

    Revised NLTT contains improved astrometry and new optical/infrared photometry for the vast majority of NLTT stars lying in the overlap of regions covered by POSS I and by the 2MASS release, approximately 44% of the sky.  The epoch 2000 positions are typically accurate to <130 mas, the proper motions to 5.5 mas/yr, and the V-J colors to 0.25 mag.  Internal binary proper motions are meaured to 3 mas/yr.  The false identification rate is ~1% for 11 < V <18 and substantially less at brighter magnitudes.
 

File Summary:
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 FileName    Lrecl    Records    Explanations
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catalog.dat    287      36085    Revised NLTT Catalogue
 
 

Description of catalog columns (see Paper II for details):
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Summary Information
1) NLTT number (corresponds to record number in original electronic catalog I/98A)
2) binary component
3) RA (2000), epoch 2000 (deg)
4) DEC (2000), epoch 2000 (deg)
5) mu_RA (arcsec/yr)
6) mu_DEC (arcsec/yr)
7) sigma(mu_RA) (arcsec/yr)
8) sigma(mu_DEC) (arcsec/yr)
9) V mag
10) V-J color
11) 3-digit source-of-information code.

NLTT data
12) RA (2000), epoch 2000  (deg)
13) DEC (2000), epoch 2000  (deg)
14) mu_RA (arcsec/yr)
15) mu_DEC (arcsec/yr)
16) B_nltt (phot mag)
17) R_nltt mag

18) Hipparcos number (0 if not in Hipparcos).
19) Identifier from TDSC, Tycho-2, or Starnet

USNO data
20) Integer RA (2000) (arcsec/100), epoch in 24)
21) Integer DEC (2000) (South polar distance in arcsec/100), epoch in 24)
22) B_usno mag
23) R_usno mag
24) USNO epoch (yr)
25) 3-digit search-history code.

2MASS data
26) RA (2000) (deg), epoch in 31)
27) DEC (2000) (deg), epoch in 31)
28) J mag
29) H mag
30) K_s mag
31) 2MASS epoch (yr)

Binarity data
31) binarity indicator
32) NLTT number of binary companion
33) NLTT estimated separation (")
34) NLTT estimated position angle (deg)
35) our estimated separation (")
36) our estimated position angle (deg)

Identifier and names
37) subcatalog code
38) Name as given in the original NLTT (*=NLTT note exist)
39) LHS number

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Fortran format statement:

format(i5,a1,2f11.6,2f8.4,2f7.4,2f6.2,1x,3i1,2f10.5,2f8.4,2f5.1,i7,1x,a12,2i10,
2f5.1,f9.3,i2,2i1,2f10.5,3f7.3,f9.3,i2,i6,f7.1,f6.1,f7.1,f6.1,i2,1x,a12,1x,a5)
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Further description of the catalog is available in Paper II

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Change history:

2002 Sep 13 Minor errors corrected. 65 new entries (57 2MASS-only entries in the south) using Bakos et al. (2002) LHS identifications added.
2002 July 17 Original version 36020 entries

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Acknowledgments.  Please acknowledge the following papers:
Paper I:  Gould & Salim, 2002, accepted to ApJ, astro-ph/0204217
Paper II: Salim & Gould, 2002, accepted to ApJ, astro-ph/0206318

If you notice an incorrect identification, please send us an e-mail

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2002 Sep 13