J/A+AS/120/201 Extragalactic radio sources optical positions (Li+ 1996)
A compiled catalogue of optical positions of extragalactic radio sources.
Li J., Jin W.
<Astron. Astrophys. Suppl. Ser. 120, 201 (1996)>
=1996A&AS..120..201L 1996A&AS..120..201L (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, radio ; Positional data
Keywords: astrometry - reference frames - catalogues - radio continuum: galaxies
Abstract:
Based on 28 individual catalogues, in which the positions of optical
counterparts of extragalactic radio sources are listed, we compiled a
combined catalogue by means of a weighted least squares adjustment.
The catalogue is in the system of FK5/J2000.0. It consists of about
five hundred sources, among which there are 56 primary sources with
position uncertainties as 0.09". Comparisons show that the orientation
differences between optical and radio frames are A1=-0.013"±0.012",
A2=0.077"±0.012", A3=0.005"±0.009". Local relative deformations
are not obvious within the precision of ground-based optical
observations.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 99 28 The observations of optical counterparts of
extragalactic radio sources
table2 39 28 Relative rotations from each individual
catalogue to the combined one
table3 76 56 Coordinates of primary sources in the
compiled catalogue
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See also:
J/A+AS/115/75 : Benchmark radio sources optical astrometry. III (Costa+, 1996)
VII/54 : Extragalactic radio-source ident. cat. (Veron-Cetty+ 1983)
I/218 : New Reference Frame defined by Extragalactic Radio Source
(IAU WG, 1995)
Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1 A1 --- Seq Sequential number
3- 20 A18 --- Ref Reference author names
22- 40 A19 --- BibCode Reference BibCode
42- 44 I3 --- Nb Number of sources
46- 50 F5.1 deg Dec1 Lower value of declination range
52- 56 F5.1 deg Dec2 Upper value of declination range
58- 63 F6.4 s e_RAs rms uncertainty on right ascension
65- 70 F6.4 arcsec e_DEs rms uncertainty on declination
72- 83 A12 --- Cat Catalogue of reference
85- 99 A15 --- Ep Epoch of reference
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Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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1 A1 --- Seq Sequential number
3- 4 I2 --- Nb Number of sources
6- 10 F5.2 arcsec A1 Relative rotation A1
12- 15 F4.2 arcsec e_A1 rms uncertainty on A1
18- 22 F5.2 arcsec A2 Relative rotation A2
24- 27 F4.2 arcsec e_A2 rms uncertainty on A2
30- 34 F5.2 arcsec A3 Relative rotation A3
36- 39 F4.2 arcsec e_A3 rms uncertainty on A3
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Byte-by-byte Description of file: table3
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Bytes Format Units Label Explanations
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1- 8 A8 --- Source Source name (based on B1950 position)
10 A1 --- Status [P] Status of the source (P: primary)
12- 13 I2 h RAh Right ascension (J2000.0)
15- 16 I2 min RAm Right ascension (J2000.0)
18- 24 F7.4 s RAs Right ascension (J2000.0)
26 A1 --- DE- Declination sign
27- 28 I2 deg DEd Declination (J2000.0)
30- 31 I2 arcmin DEm Declination (J2000.0)
33- 38 F6.3 arcsec DEs Declination (J2000.0)
40- 45 F6.4 s e_RAs rms uncertainty on right ascension
47- 51 F5.3 arcsec e_DEs rms uncertainty on declination
53- 60 A8 --- IC Individual catalogue in which the source
is available (1)
62 A1 --- TTS [QGB] Type of the source (2)
64- 67 F4.1 mag mag ? Magnitude
69- 77 A9 --- Name Other name
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Note (1): Each character corresponds to a sequential number of table1
Note (2): Q: quasar
B: BL Lac object
G: galaxy
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History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 29-Sep-1997