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I/98A NLTT Catalogue (Luyten, 1979)
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New Luyten Catalogue of stars with proper motions larger than two tenths
of an arcsecond (NLTT)
Luyten W.J.
<Minneapolis, University of Minnesota (1979)>
New Luyten Catalogue of stars with proper motions larger than two tenths
of an arcsecond (NLTT) First Supplement
Luyten W.J., Hughes H.S.
<Proper Motion Survey with the Forty-Eight inch Schmidt Telescope LV (1980)>
=1980LP.....55....1L
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ADC_Keywords: Proper motions
Description:
The NLTT catalog is a collection of stars with proper motions
exceeding 0.18"/yr found by Luyten and his coworkers. The First
Supplement to the NLTT catalog is the result of continued plate
analysis and contains data for 398 stars with proper motions
greater than 0.179"/yr. A number of corrections to the data in the
published catalog have been entered in the machine-readable
version, including the omission of duplicate entries and those
stars later determined to show no motion. The catalog contains, in
addition to the proper motions, 1950 equatorial coordinates, a
flag indicating the approximate accuracy of the positions,
estimated red and photographic magnitudes, spectral types, and
flags indicating a change from the published volume and the
presence of the star in the supplement.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
adc.doc 80 931 Documentation by Warren et al. (ascii)
doc.tex 79 844 Documentation by Warren et al. (LaTeX)
adc.sty 78 68 Style file for doc.tex
catalog.dat 65 58845 The NLTT Catalogue and 1st Supplement
remarks.dat 90 5843 Remarks for NLTT stars
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Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Name Star designation (1)
15- 16 I2 h RAh Hours RA, equinox B1950.0
18- 19 I2 min RAm Minutes RA, equinox B1950.0
21- 22 I2 s RAs Seconds RA, equinox B1950.0
24- 27 F4.1 min RAm2 [0/60] Right ascension, equinox B1950.0,
minutes only
29 I1 --- n_RAs [1/2] Flag on RA: 1 = RA originally
reported in 0.1min
31 A1 --- DE- Sign Dec, equinox B1950.0
32- 33 I2 deg DEd Degrees Dec, equinox B1950.0
35- 38 F4.1 arcmin DEm Minutes Dec, equinox B1950.0
40- 43 F4.1 mag Rmag ? Estimated red magnitude
44 A1 --- n_Rmag [+:] Flag on Rmag (2)
45- 48 F4.1 mag Ptg ? Estimated photographic magnitude
49 A1 --- n_Ptg [+v:] '+' Flag on Ptg (2)
50- 52 A3 --- SpType Spectral type; lowercase letters represent
estimated color classes or ranges.
53- 58 F6.3 arcsec/yr pm Relative proper motion, equinox B1950.0 (3)
59 A1 --- u_pm ':' if proper motion is uncertain
60- 62 I3 deg pmPA Position angle of PM vector (3)
63 A1 --- u_pmPA ':' if position angle is uncertain
64 A1 --- ModFlag [A] 'A' indicates data have been changed
(see Appendix A of adc.doc or adc.tex)
65 A1 --- SupplFlag [1] '1' indicates a star from First
Supplement (Luyten and Hughes, 1980)
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Note (1): Identifiers without prefixes are DM (Bonner and Cordoba
Durchmusterungen, written with a colon), or Luyten numbers from the
Bruce Proper Motion Survey (L numbers) or the Luyten-Palomar Survey
(LP numbers), the former in zones -45 to -89 deg and the latter in
zones +89 to -44 deg. Other miscellaneous identifiers (Oxf = Oxford AC,
Grw = Greenwich AC; U = Upgren; R = Ross, etc...).
An asterisk (*) in the identification field indicates that a not
exists in the "notes" file of the catalog.
Note (2):
':' indicates a larger uncertainty
'+' indicates a mag fainter than reported value
'v' indicates a known variability
Note (3):
The total proper motion is reported. The RA/DE proper motions can
be computed with the formulae
pmRA = pm.sin(pmPA) pmDE = pm.cos(pmPA)
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Byte-by-byte Description of file: remarks.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Name Star designation in one of many catalogs
18- 19 I2 h RAh Hours RA, equinox B1950.0
21- 22 I2 min RAm Minutes RA, equinox B1950.0
24- 25 I2 s RAs Seconds RA, equinox B1950.0
27 A1 --- DE- Sign Dec, equinox B1950.0
28- 29 I2 deg DEd Degrees Dec, equinox B1950.0
31- 34 F4.1 arcmin DEm Minutes Dec, equinox B1950.0
36- 90 A55 --- Text Note for star in free-form text
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Historical Notes:
* A large number of corrections were performed at ADC, see section 3
of "adc.doc" or "doc.tex" files
* From the "Selected Astronomical Catalogs" Vol. 1 CD-ROM (1992), directory
/astrom/nltt
* 30-Jun-1995: bad decimal point (blank or dashed) corrected in records
9694 (LP 198-153), column DEm
37692 (LP 381- 80), column pm
38236 (CD-68:1403), column Rmag
52719 (LP 983- 71), column DEm
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(End) Francois Ochsenbein [CDS] 27-Jun-1995