I/163 US Naval Observatory Pleiades Catalog (Van Flandern 1969)
The U.S. Naval Observatory Pleiades Catalog
Van Flandern T.C.
<U.S. Naval Observatory, unpublished (1969)>
ADC_Keywords: Positional data ; Proper motions ; Regional catalog
Description:
This catalog is a special subset of the Eichhorn et al. (1970)
Pleiades catalog (see I/90) updated to B1950.0 positions and with
proper motions added. It was prepared for the purpose of predicting
occultations of Pleiades stars by the Moon, but is useful for general
applications because it contains many faint stars not present in the
current series of large astrometric catalogs.
See also:
I/90 : Positions of 502 Stars in Pleiades Region (Eichhorn et al., 1970)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog 54 506 The catalog
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Byte-by-byte Description of file: catalog
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Bytes Format Units Label Explanations
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1 A1 --- cat [P] catalog designation
2- 6 I5 --- ID [4/509]+ Sequential P catalog number
8- 11 I4 --- Hertz *Hertzsprung (1947) number used in I/90
12 A1 --- m_Hertz [A] Component in visual binary system
13- 16 F4.1 mag ptv *Photovisual magnitude
18- 19 I2 h RAh Right Ascension (equinox=B1950, epoch=B1950.0)
21- 22 I2 min RAm Right Ascension B1950.0
24- 29 F6.3 s RAs Right Ascension B1950.0
32- 35 I4 0.1mas/yr pmRA *Proper motion in RA (B1950.0)
37 A1 --- DE- [±] Sign of declination, B1950.0
38- 39 I2 deg DEd Declination (equinox=B1950, epoch=B1950.0)
41- 42 I2 arcmin DEm Declination B1950.0
44- 48 F5.2 arcsec DEs Declination B1950.0
51- 54 I4 0.1mas/yr pmDE *Proper motion in DE (B1950.0)
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Note on Hertz:
Numbers are taken from the catalog of Hertzsprung (1947, Ann.
Sterrew. Leiden, 19, 1A)
Note on ptv:
Photovisual magnitudes are taken from the Eichhorn et al. (1970)
catalog, rounded off to 0.1m.
Note on pmRA, pmDE:
Proper motions are given as integers and can be read with format
I4, in which case one should divide pmRA and pmDE by 100 to
obtain centennial values in seconds of arc.
To compute pmRA in seconds of time, the cosine factor must be
accounted for, so divide pmRA by 15*cos DE.
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References:
Eichhorn H., Googe W.D., Lukac C.F., Murphy J.K., 1970,
Mem. Roy. Astron. Soc. 73, 125 (1970MmRAS..73..125E 1970MmRAS..73..125E) (Catalog I/90)
Hertzsprung E., 1947, Ann. Sterrew. Leiden, 19, 1A
(End) Wayne H Warren Jr [LASP/GSFC/HSTX] 12-Feb-1996