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I/85 Cape Photographic Catalogue 2 (Nicholson+ 1984)
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Cape Photographic Catalogue 2
Nicholson W., Penston M.J., Murray C.A., de Vegt C.
<Mon. Not. Roy. Astron. Soc., 208, 911 (1984)>
=1984MNRAS.208..911N
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ADC_Keywords: Positional data ; Proper motions ; Photographic catalog
Description:
This catalog contains the provisional positions for 51018 stars in the
Cape zone -40 deg. to -52 deg., on the FK4 system for the equinox
1950.0. The internal mean error of a single coordinate obtained from the
mean of r=four plates is estimated to be less than +/- 0.1" at the mean
epoch of observation, about 1962. The systematic deviation from the FK4
system in a small area is probably also about +/-0.1". New proper
motions have been determined for 22731 stars which are also in the
Smithsonian Astrophysical Observatory (SAO) catalogue; the formal mean
error of an annual proper motion in each coordinate is about
+/-0.004"/a.
Introduction:
The usable width of each plate is 4.1 deg. Stars were selected from the
SRS and SAO catalogs, with the SRS providing the reference frame. All
SAO stars were included except in crowded fields near the galactic
plane, in which many SAO stars were omitted. Stars were then added by
visual inspection to bring the number up to about 250, with as uniform a
distribution as possible over the plate. The number of stars measured
per plate varied from 70 to more than 700.
The numbering system adopted is based on the South Polar Distance of a
band of declination 1 deg. wide with the stars within each band being
numbered sequentially in the order of right ascension.
Approximate visual magnitudes have been determined from the image
diameters calibrated by the V values from the published literature. Only
three plates have fewer than 10 such standards; 75% of the plates have
between 15 and 30. Generally, the available stars are brighter than
V-9.5 mag.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
cpc2.dat 97 51017 The catalog
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Byte-by-byte Description of file: cpc2.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- ID CPC2P number
8- 13 I6 --- SAO ?SAO number
15- 19 I5 --- SRS ?SRS number
21- 29 F9.3 s RAs Right ascension seconds (1950)
31 A1 --- DE- Sign of declination
32- 40 F9.2 arcsec DEs Declination seconds (1950)
42- 45 I4 cmag mag Magnitude
48- 52 F5.2 a ep Epoch of observation - 1900
54- 57 F4.2 arcsec e_RAs ?Internal mean error in RAs
59- 62 F4.2 arcsec e_DEs ?Internal mean error in DEs
64 I1 --- n_mag *Magnitude status
66 I1 --- o_pos Number of plates used for position
68 I1 --- o_mag Number of plates used for magnitude
70- 75 F6.2 arcsec del_SS ?Separation of SRS and CPC2 positions
77- 81 I5 s-4/a pmRA ?Annual proper motion in RA
83- 87 I5 marcsec/a pmDE ?Annual proper motion in declination
89- 90 I2 s-4/a e_pmRA ?Mean error of proper motion in RA
92- 93 I2 marcsec/a e_pmDE ?Mean error of pm in declination
95- 97 I3 marcsec/a del_pm ?Larger pm diff. |CPC2-SAO| in RA or DE
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Note on n_mag:
0 = not available
1 = normal
2 = variable
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(End) N. G. Roman [ADC/SSDOO] 25-Jul-1997