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I/98A               NLTT Catalogue                 (Luyten, 1979)

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)> =1980PMMin..55....1L
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:
FileName Lrecl Records Explanations
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
See also: J/ApJ/582/1011 : Revised NLTT Catalog (Salim+, 2003) Byte-by-byte Description of file: catalog.dat
Bytes Format Units Label Explanations
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)
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 note 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)
Byte-by-byte Description of file: remarks.dat
Bytes Format Units Label Explanations
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
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
(End) Francois Ochsenbein [CDS] 27-Jun-1995
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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