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J/AJ/127/3587                  VLBI ICRF. II                        (Fey+, 2004)

The second extension of the International Celestial Reference Frame: ICRF-EXT.1. Fey A.L., Ma C., Arias E.F., Charlot P., Feissel-Vernier M., Gontier A.-M., Jacobs C.S., Li J., Macmillan D.S. <Astron. J., 127, 3587-3608 (2004)> =2004AJ....127.3587F
ADC_Keywords: Fundamental catalog ; Positional data ; VLBI Keywords: astrometry - catalogs - quasars: general - radio continuum: galaxies - reference systems - techniques: interferometric Abstract: We use very long baseline interferometry data obtained between mid-1995 and the end of 2002 May together with older data to extend and revise the International Celestial Reference Frame (ICRF). Revised positions of ICRF candidate and "other" sources, based on inclusion of the additional data, are presented. Positions, in the frame of the ICRF, for an additional 109 new sources are also presented. All but four of the new sources are located north of δ=-30°. Positions of the ICRF defining sources remain unchanged. We present a summary of current astrometric and geodetic observing programs and discuss the evolution and future of the ICRF. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 123 109 ICRF coordinates of 109 new sources table2.dat 123 294 Revised coordinates of the 294 ICRF candidate sources table3.dat 123 102 Revised coordinates of the 102 ICRF other sources
See also: I/251 : VLBI International Celestial Reference Frame (ICRF) (Ma+, 1997) I/218 : New Reference Frame defined by Extragalactic Radio Source (IAU WG, 1995) I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) http://hpiers.obspm.fr/webiers/results/icrf/README.html : ICRF Home Page http://aa.usno.navy.mil/AA/data/docs/ICRS_links.html : ICRS at USNO http://hpiers.obspm.fr/webiers/results/icrf/Updating.html : Updating Byte-by-byte Description of file: table1.dat table2.dat table3.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [ICRF] 6- 21 A16 --- ICRF ICRF designation (1) 23- 30 A8 --- IERS IERS identification (2) 32- 33 I2 h RAh Hour of Right Ascension (J2000) 35- 36 I2 min RAm Minute of Right Ascension (J2000) 38- 46 F9.6 s RAs Second of Right Ascension (J2000) 48 A1 --- DE- Sign of the Declination (J2000) 49- 50 I2 deg DEd Degree of Declination (J2000) 52- 53 I2 arcmin DEm Arcminute of Declination (J2000) 55- 62 F8.5 arcsec DEs Arcsecond of Declination (J2000) 64- 71 F8.6 s e_RAs Error in RAs 73- 79 F7.5 arcsec e_DEs Error in DEs 81- 86 F6.3 --- CRA-DE Correlation between right ascension and declination 88- 94 F7.1 d MEpoch MJD of mean epoch of observation (3) 96-102 F7.1 d FEpoch MJD of first epoch of observation (3) 104-110 F7.1 d LEpoch MJD of last epoch of observation (3) 112-115 I4 --- Nexp Number of 24 hour observing sessions 117-122 I6 --- Nobs Number of observations
Note (1): ICRF designations, constructed from J2000.0 coordinates with the format: ICRF JHHMMSS.s+DDMMSS or ICRF JHHMMSS.s-DDMMSS. Note (2): IERS designations, previously constructed from B1950 coordinates: IERS BHHMM+DDd or IERS BHHMM-DDd Note (3): MJD=JD-2400000.5.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 11-May-2005
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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