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IAUC 4177: 1986B; 1986A; 1982i; 1985m

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                                                  Circular No. 4177
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 617-495-7244/7440/7444

     B. Leibundgut and L. Cameron, Las Campanas Observatory, report
the discovery of a supernova in the Sb0 galaxy NGC 5105 (R.A. =
13h19m01s, Decl. = -27deg10'2, equinox 1950.0).  The supernova was found
on a plate taken on Feb. 13.3 UT with the Swope telescope and
confirmed on Feb. 17.3.  The object, of B ~ 17, is offset from the
nucleus by 50" west, 116" south.

     D. L. King, Royal Greenwich Observatory, communicates the
following precise position, obtained from an exposure on Feb. 13.0 UT:
R.A. = 10h43m57s55, Decl. = +14deg00'50"1 (equinox 1950.0).  R. McNaught,
Siding Spring Observatory, also provides a measurement from an
exposure on Feb. 6 by M. Hawkins with the U.K. Schmidt: end figures
57s56, 50"3.  An estimate by McNaught on Feb. 5.74 UT gave
mv = 14.2:.  B. Szeidl, Konkoly Observatory, reports that the
supernova was found independently by M. Lovas on Feb. 6.

     R. Barbon and F. Ciatti, Asiago Astrophysical Observatory,
telex that observations on Feb. 11, 12 and 13 by Marziani gave B =
13.7 (relative to a published sequence around NGC 3389).  Grating
spectra (dispersion 120 A/mm) show strong emission bands and the
absorption feature around 615 nm typical of type I supernovae about
two weeks past maximum.

     Total visual magnitude estimates: Feb. 15.42 UT, 4.3 (I.
Ferrin et al., Merida, Venezuela, 20 x 120 binoculars; tail 15'
long; correcting for twilight indicates m1 = 1.9); 15.78, 3.0 (T.
Lovejoy, Brisbane, Australia, 15 x 80 binoculars; tail 5' long);
16.42, 4.3 (Ferrin et al.); 16.85, 4 (M. Koishikawa, Sendai,
Japan, 7 x 50 binoculars; coma 5'); 16.87, 4.0 (T. Seki, Geisei,
Japan, 0.09-m refractor, coma 5'); 17.39, 3.5 (R. M. West, European
Southern Observatory, 7 x 50 binoculars; broad tail 0.7 deg long
curving northward).

     Total visual magnitude estimates by J.-C. Merlin, Le Creusot,
France, 0.40-m reflector): 1985 Dec. 10.78 UT, 9.1; 12.78, 9.1.

1986 February 18               (4177)              Brian G. Marsden

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