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IAUC 3115: N Oph 1977; 1977l; P/ENCKE; RY Sgr

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IAUC number 

                                                  Circular No. 3115
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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


NOVA OPHIUCHI 1977
     P. Murdin, Anglo-Australian Observatory, reports that
identification of the optical nova with the nearby x-ray transient (cf.
IAUC 3110) is strengthened by the appearance, after full data
reductions, of weak 4686 A He II emission in spectrograms obtained
with the 380-cm telescope by Cannon, Smith and Boksenberg on Sept.
16 and (with Edmunds and Chun) on Sept. 22.  The color of the otherwise
featureless spectrum (3000-7000 A) is B-V = +0.7 +/- 0.1.


PERIODIC COMET CHERNYKH (1977l)
     The following precise positions have been reported:

     1977 UT             R. A. (1950) Decl.        m1    Observer
     Sept. 12.97406    0 13 55.94   - 5 01 26.1   13.5   Vaux
           13.59653    0 13 39.59   - 5 04 46.8   12.5   Seki
           13.61111    0 13 39.16   - 5 04 50.8
           16.34931    0 12 23.46   - 5 19 42.1          Giclas
           18.64514    0 11 17.10   - 5 32 04.6          Candy
           19.65972    0 10 47.03   - 5 37 31.7            "

K. J. Vaux (Woolston Observatory).  Measurer: R. L. Waterfield.
   Forked tail 2' long in p.a. 270o (the brighter) and p.a. 240o.
T. Seki (Kochi Observatory, Geisei Station).
H. L. Giclas (Lowell Observatory).  Measurer: M. L. Kantz.
N. P. Candy (Perth Observatory, Bickley).  33-cm astrograph.


PERIODIC COMET ENCKE
     Candy also provides the following precise positions.  The indicated
correction to the prediction is now Delta-T = +0d.0156 +/- 0d.0008.

     1977 UT             R. A. (1950) Decl.
     Sept. 5.45694    12 30 36.26   - 9 35 41.5
          18.47986    14 00 47.14   -19 53 50.0


RY SAGITTARII
     J. Mattei, AAVSO, communicates the following visual magnitude
estimates by J. Morgan, Prescott, Arizona: Sept. 14.12 UT, 9.5;
15.16, 10.1; 19.12, 10.5; 21.16, 10.6; 24.11, 10.9.


1977 September 30              (3115)              Brian G. Marsden

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