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IAUC 3058: Occn OF SAO 158687 BY URANIAN RINGS; 1977c

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                                                  Circular No. 3058
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK     Telex: 921428
Telephone: (617) 864-5758

     W. B. Hubbard, Lunar and Planetary Laboratory, reports that
analysis of photometric traces obtained by B. Zellner at the Perth
Observatory shows the following occultations.  These events can be
identified with occultations observed by Elliot et al., so their
notation (cf. IAUC 3051) is utilized:

     Event         UT           Event      UT
     alpha1     20h20m06s       alpha2  21h42m21s
                                beta2   21 43 38

These timings are preliminary (uncertainty +/- 5s for alpha2 and beta2).
Nothing of statistical significance appears at the times of the
events alpha3 and beta3 reported by Millis et al. (IAUC 3051).
Observations were not made around the times of the other reported events.

     L. H. Wasserman, Lowell Observatory, reports that Millis et al.
could not have observed the alpha1 and delta1 events, for these would have
taken place at Perth at a few seconds after 20h20m and 20h15m UT,
respectively, and observations were interrupted for recentering for
some 5-10 seconds beginning at these exact times.  The events alpha3
and beta3 were noticeably shallower than the others

     J. L. Elliot, Cornell University, remarks that the events alpha3
and beta3 are probably present in the Kuiper Airborne Observatory data
but are not at all conspicuous.

     J. C. Bhattacharyya, Indian Institute of Astrophysics, reports
that the event observed by K. Kupppswamy and himself at Kavalur began
at 20h19m38s UT (i.e., epsilon5 = 20h19m42s; cf. IAUC 3048, 3051).
The shorter occultations were not noted, and observations had ceased
by the time of any corresponding events after the Uranus appulse.

     The following precise positions, obtained by T. Seki at the
Geisei Station of the Kochi Observatory, are taken from Yamamoto
Circ. No. 1848:

     1977 UT             R. A. (1950) Decl.         m1
     Feb. 28.77917    10 26 53.05   +34 43 32.6   ~17-18
     Mar. 19.70000    10 11 33.98   +33 18 55.2   ~17-18

1977 April 6                   (3058)              Brian G. Marsden

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