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IAUC 3096: 1976j; OPTICAL COUNTERPARTS OF X-RAY SOURCES; NOVAE

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                                                  Circular No. 3096
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


PERIODIC COMET KLEMOLA (1976j)
     Further positions have been reported as follows:

     1976/77 UT          R. A. (1950) Decl.        Observer
     Aug. 25.14946    23 01.82      + 3 58.6       McCrosky
          26.17992    23 01 59.19   + 3 46 57.3    Shao
     Sept.23.18326    23 04 47.19   - 2 26 14.7      "
     Oct. 27.03620    23 21 25.85   - 7 02 28.7    Schwartz
     Dec. 24.08194     0 31.34      - 3 26.8       Roemer
          24.12708     0 31.41      - 3 26.5         "
     Jan. 21.02716     1 13 14.33   + 0 31 01.6    Shao

R. E. McCrosky, C.-Y. Shao and G. Schwartz (Harvard Observatory,
   Agassiz Station).  Measurers: Shao and J. H. Bulger.
E. Roemer (Lunar and Planetary Laboratory, Catalina Station).


OPTICAL COUNTERPARTS OF X-RAY SOURCES
     P. A. Charles, J. R. Thorstensen and S. Bowyer, University of
California at Berkeley, report that that the Davidsen et al. (1976,
Astrophys. J. 203, 448) candidate for 3U 1728-16 exhibits 4640-4650
A and 4686 A emission, confirming its identification as the optical
counterpart; its similarity to Sco X-1 at x-ray and optical
wavelengths suggests that it may be variable.  They have also
discovered a faint star (V ~ 19.2) in the SAS-3 rmc error box of the
flaring x-ray source 3U 0042+32 (Rappaport et al. 1977, submitted
to Nature) that exhibits 4686 A emission and suggest that it is the
optical counterpart; its location (uncertainty +/- 2") is R.A. =
0h42m07s.0, Decl. = +32o44'09" (equinox 1950.0).


NOVAE
     The following visual magnitude estimates have been reported:

     Nova Sgr 1977.  June 12.2 UT, 11.4 (K. Simmons, Jacksonville,
Florida); 26.37, 11.7 (P. L. Collins, Steward Observatory); July
10.39, 11.8 (Collins); Aug. 2.11, 10.7 (S. O'Meara, Harvard Obs.).

     Nova Sge 1977.  June 26.40, 11.8 (Collins); July 9.10, 12.0
(J. Bortle, Brooks Observatory); 27.08, 11.8 (Bortle).

     NQ Vul.  June 20.3, 11.5 (Simmons); July 11.85, 11.4 (D. P.
Elias, Athens Observatory); 27.08, 12.3 (Bortle).


1977 August 18                 (3096)              Brian G. Marsden

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