Circular No. 3491 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION 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 SUPERNOVAE 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. CYGNUS X-1 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." SATELLITES OF SATURN 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. KR AURIGAE 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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