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I/151 Precise Radio Source Positions from Mark III VLBI (Ma+ 1990)
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Precise Radio Source Positions Determined by Mark III VLBI: Observations from
1979 to 1988 and a Tie to the FK5
Ma C., Shaffer D.B., de Vegt C., Johnston K.J., Russell J.L.
<AJ, 99, 1284 (1990)>
=1990AJ.....99.1284M
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ADC_Keywords: Radio sources ; Positional data ; VLBI
Description:
This catalog contains observations from 600 Mark III VLBI experiments
from conducted between 1979 to 1988. These experiments resulted
in 237681 acceptable pairs of group delay and phase delay rate observations.
These have been used to derive positions of 182 extra-galactic radio sources
with typical formal standard errors less than 1 mas.
The right ascension zero point of this reference frame has been
aligned with the FK5 by using the optical positions of 28 extragalactic
radio sources whose positions are on the FK5 system. Also included are
the Mark III VLBI stations and a summary of the analysis configuration.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 94 182 Source positions (J2000) from GLB353 solution
table4.dat 50 28 FK5 optical positions of 28 extragalactic
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- IAU IAU name of radio source
11- 19 A9 --- Other ?Other name of radio source
21- 22 I2 h RAh right ascension (hours) (J2000)
24- 25 I2 min RAm right ascension (minutes) (J2000)
27- 35 F9.6 s RAs right ascension (seconds) (J2000)
37- 44 F8.6 s e_RAs standard error of RA (seconds) (J2000)
46 A1 --- DE- declination sign (J2000)
47- 48 I2 deg DEd declination (degrees) (J2000)
50- 51 I2 arcmin DEm declination (minutes) (J2000)
53- 60 F8.5 arcsec DEs declination (seconds) (J2000)
62- 68 F7.5 arcsec e_DEs standard error of DE (seconds)
70- 75 F6.3 --- CORR RA-DE correlation
77- 84 F8.3 a EPOCH Mean Julian epoch
86- 88 I3 --- NEXP number of experiments
90- 94 I5 --- NOBS number of observations
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Notes:
1) The positions are relative to the J2000.0 coordinate system as defined
by the conventional models on the reference date 1980 October 17.The
right ascension zero point is defined by minimizing the adjustment of the
right ascensions, scaled by cos DE, of the 28 sources with FK5 positions
from the values given in table4
2) The standard errors given are the formal 1e errors from the GLB353
solution scaled by the square root of the reduced chi-square of the
solution. See text.
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- IAU IAU name of radio source
10- 18 A9 --- Other ?Other name of radio source
20- 21 I2 h RAh right ascension (hours) (J2000)
23- 24 I2 min RAm right ascension (minutes) (J2000)
26- 32 F7.4 s RAs right ascension (seconds) (J2000)
34 A1 --- DE- declination sign (J2000)
35- 36 I2 deg DEd declination (degrees) (J2000)
38- 39 I2 arcmin DEm declination (minutes) (J2000)
41- 46 F6.3 arcsec DEs declination (seconds) (J2000)
48- 50 A3 --- TYPE *radio source types
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Note on TYPE:
QSO=quasar, BLO=BL Lac object, GAL=galaxy
Table 1: Mark III VLBI stations
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ALGOPARK Algonquin Park, Ontario, Canada
CHLBOLTN Chilbolton, U.K.
EFLSBERG Effelsberg, F.R.G.
GILCREEK Fairbanks, Alaska
GOLDVENU Fort Irwin, California
HARTRAO Johannesburg, South Africa
HATCREEK Hat Creek, California
HAYSTACK Westford, Massachusetts
HRAS 085 Fort Davis, Texas
KASHIMA Kashima, Japan
KAUAI Kauai, Hawaii
KWAJAL26 Kwajalein Atoll, Marshall Islands
MARPOINT Maryland Point, Maryland
MEDICINA Medicina, Italy
MOJAVE12 Fort Irwin, California
NRAO 140 Green Bank, West Virginia
ONSALA60 Onsala, Sweden
OVRO 130 Big Pine, California
PENTICTN Penticton, British Columbia, Canada(*)
PLATTVIL Platteville, Colorado(*)
RICHMOND Richmond, Florida
ROBLED32 Madrid, Spain
VNDNBERG Vandenburg Air Force Base, California
WESTFORD Westford, Massachusetts
WETTZELL Wettzell, F.R.G.
YELLOWKN Yellowknife, Northwest Territories, Canada(*)
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(*) Mobile VLBI site.
Table 2: Summary of analysis configuration
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Models: Solar system - PEP planetary ephemeris
Precession and sidereal time - J2000.0
Nutation - IAU 1980 (see also parameters)
Solar relativistic deflection of light
Solid earth tides
Calibrations: Troposphere - CfA 2.2 using meteorological data
Chao if no meteorological data
Ionosphere - simultaneous S/X observations
Length of timing signal/phase cal cable
Parameters: Global - Source positions
(adjusted) Arc - Site positions
Nutation offsets in longitude and obliquity
Polynomial and sinusoidal clocks
Zenith atmosphere delays
Constrained atmosphere rates
Reference Date: 1980 October 17
Data: Mark III group delays and phase delay rates
Observations: 237681
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(End) James E. Gass [SSDOO/ADC] 13-Feb-1998