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I/146 Positions and Proper Motions (Roeser+ 1988)
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Catalogue of Positions and Proper Motions
Roeser S., Bastian U.
=1988A&AS...74..449R
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ADC_Keywords: Positional data; Proper motions
Description:
PPM North gives J2000 positions and proper motions of 181,731
stars north of -2.5 degrees declination. Its main purpose is to
provide a convenient, dense, and accurate net of astrometric
reference stars that represents the new IAU (1976) coordinate
system on the sky. The mean epoch is near 1931. The average mean
errors of the positions and proper motions are 0.27" and 0.43"/cen.
On the average six measured positions are available per star; 1064
stars do not have sufficient redundancies to resolve discrepancies.
In addition to the positions and proper motions, the PPM (North)
contains the BD number, the magnitude, the spectral type, the number
of positions included, the mean error of each component of the
position and proper motion, the weighted mean epoch in each
coordinate, the numbers in the SAO, HD, and AGK3 catalogs, and
various standard notes. In addition a number of individual notes
are given in the introduction.
The PPM North consists of three files: a descriptive document
supplied by the authors for more detail regarding the scope,
construction, properties, and usage of PPM North; the data file
for the PPM North itself; and a version of PPM North in the format
of the preliminary PPM North. See author supplied description for
more complete information.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
descrip.doc 80 1145 Authors' description
ppmnorth.dat 131 181731 Positions and Proper Motions - North
ppmnofmt.dat 138 181731 PPM North - in format of old PPM
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Byte-by-byte Description of file: ppmnorth.dat
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Bytes Format Units Label Explanations
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2- 7 I6 --- PPM *Designation of the star
10- 18 A9 --- DM *BD (zones -02 to -22), else CD
20- 23 F4.1 mag mag *Magnitude
25- 26 A2 --- Sp *Spectral type
28- 29 I2 h RAh Right Ascension J2000 (hours)
31- 32 I2 min RAm Right Ascension J2000 (minutes)
34- 39 F6.3 s RAs Right Ascension J2000 (seconds)
42 A1 --- DE- Declination J2000 (sign)
43- 44 I2 deg DEd Declination J2000 (degrees)
46- 47 I2 arcmin DEm Declination J2000 (minutes)
49- 53 F5.2 arcsec DEs Declination J2000 (seconds)
56- 62 F7.4 s/yr pmRA *Proper motion in RA, J2000
64- 69 F6.3 arcsec/yr pmDE *Proper motion in DE, J2000
71- 72 I2 --- N *Number of individual published positions used
74- 75 I2 10mas e_RA *Mean error of RA
77- 78 I2 10mas e_DE *Mean error of DE
80- 83 F4.1 mas/yr e_pmRA *Mean error of pmRA
85- 88 F4.1 mas/yr e_pmDE *Mean error of pmDE
90- 94 F5.2 yr EpRA *Weighted mean epoch, RA and pmRA
96-100 F5.2 yr EpDE *Weighted mean epoch, DE and pmDE
102-107 I6 --- SAO [1/258997]? SAO Designation
109-114 I6 --- HD [1/350000]? Henry Draper Designation
117-125 A9 --- CPD Cape Photographic Durchmusterung Designation
127 A1 --- Flag1 *'P' - problem, 'C' - comment
128 A1 --- Flag2 *'D' - double star
129 A1 --- Flag3 * - not used
130 A1 --- Flag4 *'F' - member of FK5
131 A1 --- Flag5 *'R' - remark, 'V' - V mag (CPC-2)
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Note on PPM:
Designation of the star in PPM South starting with No. 181732,
see chapter 3 of the author's description file.
Note on DM:
Designation of the star in the Bonner Durchmusterung (for zones from
-02 to -22 degrees) or in the Cordoba Durchmusterung (zones -23 to
-89 degrees).
Note on mag and Sp:
See chapter 3 of description file.
Note on pmRA and pmDE:
Proper motion in right ascension fro epoch and equinox J2000.0,
on the system of FK5 given in seconds of time per Julian year.
Note on N:
Number of individual published positions used for the
derivation of the position and proper motion given.
Note on e_RA:
Mean error of right ascension at the mean epoch of right ascension,
multiplied by the cosine of declination, given in units of #0.01
seconds of arc.
Note on e_DE:
Mean error of declination at the mean epoch of declination, given in
units of #0.01 seconds of arc.
Note on e_pmRA:
Mean error of the proper motion in right ascension, multiplied by
the cosine of declination, given in units of 0.001 seconds of arc
per Julian year.
Note on e_pmDE:
mean error of the proper motion in declination given in units of
0.001 seconds of arc per Julian year
Note on EpRA:
Weighted mean epoch of the measured positions used for the
derivation of RA and pmRA, given in years since 1900.0.
Note on EpDE:
Weighted mean epoch of the measured positions used for the
derivation of DE and pmDE, given in years since 1900.0.
Note on Flag1:
P - problem case, preferably not to be used as astrometric
reference star.
C - a critical comment is given in the List of Critical Comments.
Not to be used as astrometric reference star.
Note on Flag2:
D - double star, preferably not to be used as astrometric
reference star.
Note on Flag3:
Not used, void for consistency with PPM (north).
Note on Flag4:
F - member of FK5, mostly bright stars, original FK5 data
are given.
Note on Flag5:
R - a remark is given in the List of Remarks on Individual
Stars.
V - the magnitude is a photographic V magnitude copied from
CPC-2.
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Byte-by-byte Description of file: ppmnofmt.dat
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Bytes Format Units Label Explanations
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2- 4 A3 --- cat The catalog prefix 'PPM'
5- 10 I6 --- PPM Designation of the star
11- 16 F6.1 mag mag Magnitude
19- 20 A2 --- Sp Spectral type
22 A1 --- Flag1 *Problem flag
24- 38 F15.8 rad RA1950 RA equinox and epoch B1950, FK4
40- 54 F15.8 rad DE1950 DE equinox and epoch B1950, FK4
56- 67 F12.5 0.01rad/yr pmRA1950 Proper motion in RA, B1950, FK4
69- 80 F12.5 0.01rad/yr pmDE1950 Proper motion in DE, B1950, FK4
82- 96 F15.8 rad RA RA equinox and epoch J2000, FK5
98-112 F15.8 rad DE DE equinox and epoch J2000, FK5
114-125 F12.5 0.01rad/yr pmRA Proper motion in RA, J2000, FK5
127-138 F12.5 0.01rad/yr pmDE Proper motion in DE, J2000, FK5
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Note on Flag1:
P - problem case, preferably not to be used as astrometric
reference star.
C - a critical comment is given in the List of Critical Comments.
Not to be used as astrometric reference star.
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(End) Gail L. Schneider [NSSDC/ADC] 14-Nov-1994