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I/202 The FK5 Extension of the FK4 System (Lattanzi+ 1993)
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The FK5 Extension on the FK4 System
Lattanzi M.G., Taff L.G.
<Astron. J., 105, 2353, (1993)>
=1993AJ....105.2353L
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ADC_Keywords: Positional data ; Proper motions ; Fundamental catalog
Description:
The FK5 catalog was expanded from 1535 stars to include an additional
3117 stars which comprise the 'extension' to the new 'Basic' FK5, the
revision of the FK4. For the basic FK5 a method of converting from the
FK5 system to the FK4 system is provided in the catalog while for the
Extension no algorithm was supplied. This catalog consists of two
files. One file is the FK5 Extension placed at B1950.0 on the FK4
system. The second file is the FK5 Extension placed at the mean Epoch
of place on the FK4 system.
File Summary:
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File Name Lrecl Records Explanations
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ReadMe 80 . This file
fk5e1950.dat 87 3117 FK5 Extension at B1950.0 on FK4 system
fk5emean.dat 87 3117 FK5 Extension on the FK4 B1950.0 (Mean epoch of place)
catalog.doc 80 207 Description of the catalog
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See also:
I/143 : FK4 and FK4 Supplement (Fricke+ 1963)
I/149 : FK5 Catalogue (Fricke+ 1988)
I/175 : FK5 Extension (Fricke+ 1991)
Byte-by-byte description of file: fk5e1950.dat, fk5emean.dat
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Bytes Format Units Label Explanation
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2- 5 I4 --- FK5 FK5 Extension ID number
6-11 F6.2 mag Vmag V magnitude
12-26 F15.10 h RAh Right Ascension (B1950.0) in decimal hrs
27-41 F15.10 deg DEdeg Declination (B1950.0) in decimal degrees
42-49 F8.2 yr Epoch_RA Mean Epoch of RA in decimal years
50-57 F8.2 yr Epoch_DEC Mean Epoch of DEC in decimal years
70-78 F9.3 cs/yr pmRA Proper Motion in RA (B1950.0) sec/cy
79-87 F9.3 carcsec/yr pmDE Proper Motion in DEC (B1950.0) arcsec/cy
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References:
Taff, L.G., Computational Spherical Astronomy, Wiley and Sons, Inc.
NY, p.49 (1981)
Taff, L.G., Bucciarelli, B., And Lattanzi, M.G., Ap.J., 361, 367 (1990)
(1990ApJ...361..667T)
Acknowledgements:
Dr. Taff supplied the catalog documentation in printed form. This
documentation was then keyed in at the ADC.
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(End) N. Paul M. Kuin [NASA/NSSDC/ADC] 1996-Apr-18