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IAUC 3491: SNe; Cyg X-1; Sats OF SATURN; KR Aur

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IAUC number

                                                  Circular No. 3491
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM     Telephone 617-864-5758

     J. Maza, Department of Astronomy, University of Chile, reports
the discovery of a supernova in a faint anonymous galaxy located at
R.A. = 13h45m.0, Decl. = -32o17' (equinox 1950.0).  The supernova is 14"
west and 6" north of the galaxy's nucleus.  On the discovery plate
(taken by C. Torres) on June 13.139 UT, mpg = 18.0; on June 30.983
Maza and L. E. Gonzalez obtained mpg = 19.5  At the same time, the
supernova reported on IAUC 3489 was mpg = 18.5.

     With reference to the note on IAUC 3485, W. S. Penhallow,
University of Rhode Island, writes that his measurement of an exposure
of supernova 1979C obtained on 1979 May 1 gives R.A. = 12h20m26s.72,
Decl. = +16o04'29".0 (equinox 1950.0).  The nucleus of the parent galaxy
M100 (NGC 4321) was measured at R.A. = 12h20m22s.96, Decl. = +16o05'56".5.

     M. Oda and the Hakucho Team, University of Tokyo, report:
"Since June 11 Hakucho has been observing Cyg X-1 in its high state
with a flux of ~ 1 Crab over the range 1-12 keV.  As of June 27 it
was at the same level.  Transition from low to high took place some
time between our observations of May 13-17 and early June."

     P. Lamy and N. Mauron, Laboratoire d'Astronomie Spatiale,
Marseilles, send the following precise measurements of 1980 S 10
(cf. IAUC 3463) with respect to the center and equatorial plane of
Saturn: Mar. 15.9528 UT, +57".24 (east), -0".55 (south); 15.9851,
+58".93, -0".38; 16.0236, +60".40, -0".37; 16.0892, +61".45, -0".57;
16.126, +61".65, -0".67.  They also provide the measurements: 1966
S 2, Mar. 15.9851, 22".45 west; 1980 S 3, Mar. 16.126, 19".75 east.
They add that orbital analysis shows that 1980 S 10 (= 1980 S 6:
cf. IAUC 3483) leads Saturn IV (Dione) by 72o.0.  1980 S 13 could
not be found on plates taken on Mar. 15.9528 and 16.962 on the
assumption that it trails Saturn IV by 57o and was brighter than
magnitude 18.

     Corrigendum.  On IAUC 3471, line 7, for  5' to the southwest
read  5' to the southeast.

1980 July 3                    (3491)              Daniel W. E. Green

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