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Science 10 October 1986:
Vol. 234. no. 4773, pp. 187 - 189
DOI: 10.1126/science.234.4773.187
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Articles
Very Long Baseline Interferometric Observations Made with an Orbiting Radio Telescope
G. S. LEVY 1,
R. P. LINFIELD 1,
J. S. ULVESTAD 1,
C. D. EDWARDS 1,
J. F. JORDAN JR. 1,
S. J. DI NARDO 1,
C. S. CHRISTENSEN 1,
R. A. PRESTON 1,
L. J. SKJERVE 1,
L. R. STAVERT 1,
B. F. BURKE 2,
A. R. WHITNEY 3,
R. J. CAPPALLO 3,
A. E. E. ROGERS 3,
K. B. BLANEY 4,
M. J. MAHER 5,
C. H. OTTENHOFF 6,
D. L. JAUNCEY 7,
W. L. PETERS 8,
T. NISHIMURA 9,
T. HAYASHI 9,
T. TAKANO 9,
T. YAMADA 9,
H. HIRABAYASHI 10,
M. MORIMOTO 10,
M. INOUE 10,
T. SHIOMI 11,
N. KAWAGUCHI 11, and
H. KUNIMORI 11
1 Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109.
2 Massachusetts Institute of Technology, Cambridge, MA 02139.
3 Observatory, Westford, MA 01886.
4 Goddard Space Flight Center, Greenbelt, MD 20771.
5 Bendix Field Engineering Corporation, Seabrook, MD 20706.
6 TRW Space and Technology Group, Las Cruces, NM 88004.
7 Division of Radiophysics, Commonwealth Scientific and Industrial Research Organization, Canberra, Australian Capital Territory 2601, Australia.
8 Mount Stromlo Observatory, Australian National University, Canberra, Australian Capital Territory 2606, Australia.
9 Institute for Space and Astronautical Science, Tokyo, 153, Japan.
10 Nobeyama Radio Observatory, Nobeyama, 384-13, Japan.
11 Radio Research Laboratory, Kashima, 314, Japan.
An orbiting spacecraft and ground observatories have been used to obtain interferometric observations of cosmic radio sources. The Tracking and Data Relay Satellite System (TDRSS) was used as the orbiting observatory in conjunction with two 64- meter radio telescopes at ground observatories, one in Australia and one in Japan. The quasars 1730-130 (NRAO 530), 1510-089, and 1741-038 were observed at a frequency of 2.3 gigahertz, and a maximum projected baseline of 1.4 earth diameters was achieved. All quasar observations for which valid data were acquired resulted in detected fringes. Many of the techniques proposed for a dedicated very long baseline interferometry observatory in space were used successfully in this experiment.
Submitted on August 28, 1986
Accepted on September 12, 1986
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