Abstract
THE position of GX3+1 has previously been reported by Schnopper et al.1 with sufficient accuracy to allow the times of lunar occultations to be predicted to within about ±3 min2. This uncertainty in the predicted time can be covered by the relatively brief observation period of the flight of a sounding rocket. Two of the present cycle of lunar occultations were predicted for the rocket range at Woomera, Australia, and were successfully observed: the first on September 27, 1971, by the Leicester X-ray Astronomy Group, and the second on October 24, 1971, by the Mullard Space Science Laboratory, UCL.
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References
Schnopper, H. W., Bradt, H. V., Rappaport, S., Boughan, E., Barnell, B., Doxsey, R., Mayer, W., and Watt, S., Astrophys. J. Lett., 161, L161 (1970).
Morrison, L. V., Nature Physical Science, 229, 192 (1971).
Griffiths, R. E., Cooke, B. A., and Pounds, K. A., Nature Physical Science, 229, 175 (1971).
IAU, Trans. Intern. Astron. Union, 13 B, 49 (1967).
Kunkel, W., Osmer, P., Smith, M., Hoag, A., Schroeder, D., Hiltner, W. A., Bradt, H., Rappaport, S., and Schnopper, H. W., Astrophys. J. Lett., 161, L169 (1970).
Watts, C. B., Astron. Pap. XVII (Washington, 1963).
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JANES, A., POUNDS, K., RICKETTS, M. et al. Identification of GX3+1 from Lunar Occultations. Nature 235, 152–155 (1972). https://doi.org/10.1038/235152a0
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DOI: https://doi.org/10.1038/235152a0
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