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J/AJ/114/850                           Errors in the FK5 Catalog (Stone 1997)

Systematic errors in the FK5 catalog as determined from CCD observations in the extragalactic reference frame Stone R.C. <Astron. J. 114, 850 (1997)> =1997AJ....114..850S
ADC_Keywords: Fundamental catalog ; Positional data Abstract: This paper presents new positions for 689 FK5 stars determined directly in the extragalactic reference system from CCD scan observations made with the Flagstaff Astrometric Scanning Transit Telescope (FASTT). All the observations were made in 1994-1996 with an accuracy of ~±40mas in each coordinate. When these positions are compared with their counterparts in the FK5 catalog, systematic errors in the FK5 are found that vary in both right ascension and declination and can be as large as 100 mas in magnitude. No magnitude-dependent errors in the FK5 were found. Moreover, the true error in FK5 star positions is determined to be ~±80mas in both coordinates or two times the expected catalog positional errors. There is an excellent agreement between the systematic errors in the FK5 found in this paper and those presented in Lindegren et al. (1995A&A...304...44L) comparing FK5 and Hipparcos 30-month star positions. By comparing corresponding FASTT and FK5 star positions, the link between the optical and extragalactic reference frames was determined and is given by the following rotations (ωxyz) = (3±5, 25±5, 16±4) (s.e.) mas, which agree well with previous determinations made by other investigators. Two of the rotations (ωyz) are significantly larger than their standard errors and, therefore, presumably real. Finally, since these rotations are small (≤25mas), the FK5 and extragalactic reference frames must be closely aligned to one another. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table.dat 102 689 FK5 star positions determined in the extragalactic reference frame with the FASTT CCD meridian telescope
See also: I/149A : Fifth Fundamental Catalogue (FK5) Part I (Fricke+, 1988) I/175 : Fifth Fundamental Catalogue (FK5) - Extension (Fricke+ 1991) Byte-by-byte Description of file: table.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Running number 5- 9 I5 --- FK5 FK5 star number (Cat. I/149, I/175) 12- 17 I6 --- HD HD designation 19- 22 F4.1 mag Vmag V magnitude taken from FK5 catalog 25- 26 I2 h RAh Right ascension, J2000 28- 29 I2 min RAm Right ascension, J2000 31- 37 F7.4 s RAs Right ascension, J2000 39- 42 F4.1 10-4s e_RAs Standard error in RA 44- 46 I3 --- o_RAh Number of times observed in RA 49- 54 F6.3 yr EpRA-1900 Mean epoch of RA coordinate (+ 1900) 56- 62 F7.3 10-2s/yr pmRA Proper motion in RA taken from FK5 65 A1 --- DE- Declination sign 66- 67 I2 deg DEd Declination, J2000 69- 70 I2 arcmin DEm Declination, J2000 72- 77 F6.3 arcsec DEs Declination, J2000 79- 81 I3 mas e_DEs Standard error in DE 83- 85 I3 --- o_DEd Number of times observed in DE 88- 93 F6.3 yr EpDE-1900 Mean epoch of DE coordinate (+ 1900) 96-102 F7.2 10mas/yr pmDE Proper motion in DE taken from FK5
Origin: AAS CD-ROM series, Volume 9, 1997 Lee Brotzman [ADS] 27-Sep-1997
(End) [CDS] 05-Feb-1998
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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