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I/62C Perth 70 B: Positions 24900 Stars (Hog+ 1976)
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Perth 70: A Catalogue of Positions of 24900 Stars Part B, Mean Values of the
Observations
Hog E., von der Heide J.
<Abh. der Hamberger Sternwarte, Band IX. (1976)>
=1976AAHam...9....1H
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ADC_Keywords: Astrometric data; Photometry
Description:
This Perth 70: A Catalogue of Positions of 24900 Stars contains accurate
positions and magnitudes of 24,871 reference stars, mostly in the
southern hemisphere, plus other useful data such as approximate proper
motions, radial velocities, and parallaxes. The Perth 70 is a result of
meridian circle observations made by the Hamburg Observatory expedition
to Perth as part of the international effort on Southern Reference Stars
(SRS). The catalog described here provides the mean values for each
star, including the position, magnitude, and mean epoch of observation;
the proper motions, however, were neither observed nor recomputed from
comparing the Perth positions to older material.
Introduction:
This catalog is the September 1992 version of the results of meridian
circle carried out at Perth in the late 1960's and early 1970's.
Some 107 circumpolar stars occupy two records each, one for observations
at upper culmination and one for observations at lower culmination, so
the number of records is greater than the number of stars.
This file contains the mean values of the meridian circle observations
(position and magnitude) made at Perth, plus auxiliary quantities
usually taken from the preliminary version of the Southern Reference
Stars (SRS) catalog (Corwin, 1992). The first part of each record
presents the same information that is contained in the printed catalog;
the remaining information was not printed.
Missing data are denoted by blank-filled fields except for the standard
errors of one observation in R.A. * cos(dec) and in declination. In
those fields, missing data are indicated by "0". Stars with numbers in
the 30000's are in the FK4 catalog, with the last four digits being the
FK4 number. Stars with numbers in the 40000's are in the Bright Star
Catalog in the same format. Stars with other numbers are program stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
newperth.dat 150 24978 The catalog
newperth.doc 80 421 The original more detailed ADC document
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Byte-by-byte Description of file: newperth.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- ID Perth 70 catalog number
6 A1 --- n_ID [S ] S means star is in the FK4 suppl.
7- 12 F6.2 mag V *V magnitude
14- 15 A2 --- Sp *Spectral type; from SRS
16- 18 I3 h RAh *Right ascension hours (B1950)
19- 21 I3 min RAm *Right ascension minutes (B1950)
22- 28 F7.3 s RAs *Right ascension minutes (B1950)
29 A1 --- cul *[UL ] Culmination flag
31 A1 --- DE- Sign of declination
32- 33 I2 deg DEd Declination degrees (B1950)
34- 36 I3 arcmin DEm Declination minutes (B1950)
37- 42 F6.2 arcsec DEs Declination seconds (B1950)
43- 47 I5 ma epRA Mean epoch of observation in RA -1900000
48- 52 I5 ma epDE Mean epoch of observation in dec -1900000
53- 55 I3 --- o_RA Number of observations in RA
56 A1 --- RAdel [* ] Indicates >=1 obser. in RA deleted
57- 58 I2 --- o_DE Number of observations in declination
59 A1 --- DEdel [* ] Indicates >=1 obser. in dec deleted
60- 63 I4 carcsec q_RAs *Residual in right ascension
64- 68 I5 carcsec q_DEs *Residual in declination
69- 75 I7 s-5/a pmRA *?Proper motion in right ascension
76- 82 I7 arcsec-4/a pmDE *?Proper motion in declination
84- 85 A2 --- DMcat *Durchmusterung catalog
87- 89 I3 --- DMzone ?Durchmusterung zone
90- 94 I5 --- DMnum ?Durchmusterung number
96 A1 --- type *Type of star
97-102 I6 --- obs_no *Observing number for part A
103-105 I3 --- o_obs_no Number of records in part A
106-110 I5 --- n_n_ID ?FK4 Supplement number
111-116 I6 dkm/s RV ?Radial Velocity
117-120 I4 marcsec Plx ?Parallax
121-123 I3 --- o_V Number of observations of magnitude
124 A1 --- n_V [* ] Indicates >=1 obser. in V deleted
125-128 I4 ca mean ?Mean epoch of observation in V -190000
129-131 I3 carcsec e_RAs Standard error of one obs. in RA*cos(dec)
132-134 I3 carcsec e_DEs Standard error of one obs. in declination
135-137 I3 cmag e_V ?Standard error of one obs. in magnitude
138-141 I4 carcsec n_PlxRA Mean parallax factor in right ascension
142-145 I4 carcsec n_PlxDE Mean parallax factor in declination
146-150 F5.1 mag pre_V *V magnitude from preliminary SRS cat.
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Note on V:
If the hundredths place (byte 12) is blank, the number was copied from
the preliminary SRS; otherwise, the magnitude was observed at Perth.
Note on Sp:
The spectral types are always those of the printed catalog. Two stars
must be mentioned specifically: fl2 Velorum (SRS #30309) and O Cygni
(SRS #44262). The first, a Wolf-Rayet star (type WC), is listed in the
FK5 as "Oap" (the HD designation) and appears here as "O0." The second,
a Mira Ceti-type pulsating variable, spectral type "S7ev," appears here
as "M7."
Note on RA* and DE*:
Positions are referred to the system of the FK4 (equinox B1950.0) at the
mean epoch of observation for each coordinate for each star.
Note on cul:
This is blank except for circumpolar stars, which have 2 records, one
marked `U' for upper culmination observations, and one marked `L' for
lower culmination observations.
Note on q_RAs and q_DEs:
These are the Perth position minus the position in the preliminary SRS,
corrected for proper motion to the mean epoch of observation. The signs
of the residuals are changed for circumpolar stars observed at lower
culmination.
Note on pm*:
These are copied from the preliminary SRS; the Perth 70 positions were
not used to compute them. For centennial proper motions, use formats
F7.3 and F7.2 for proper motion in RA and proper motion in declination,
respectively.
Note on DMcat:
The catalog identifier (bytes 84-85) is either `BD' for Bonner
Durchmusterung, `CD' for Cordoba Durchmusterung, or `CP' for Cape
Photographic Durchmusterung. The zone is contained in bytes 87-89 (with
the sign in byte 87), and the serial number, in bytes 90-94.
Note on type:
One of `P' for program star, `F' for FK4 star, or `B' for Bright Star
Catalog star.
Note on obs_no:
This number is included to enable cross references between this catalog
and Part A; it does not appear in the printed catalog and should not be
used as the principal identification number. Circumpolar stars have
distinct observing numbers for upper and lower culmination. (Part A
lists the individual observations.)
Note on pre_V:
The preliminary SRS positions may be recovered by
RA SRS =RA Perth-PM RA(t RA-1950)+/-(delta RA cos(dec))=15cos(dec SRS)
dec SRS = dec Perth-PM dec(t dec-1950)+/-delta dec
where t is the mean epoch for the coordinate. The plus sign is taken
only for stars observed at lower culmination. The factor 15 in the first
equation emphasizes that ff cosffi is tabulated in arc seconds whereas
right ascension is customarily expressed in units of time.
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(End) N. G. Roman [SSDOO/ADC] May-27-1997