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IAUC 5028: 1990L; V3890 Sgr; 1990c

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                                                  Circular No. 5028
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505

     J. Mueller reports her discovery of a supernova in UGC 9927
(R.A. = 15h34m.2, Decl. = +22 40', equinox 1950.0).  The supernova
is 20" east and 2" south of the galaxy's nucleus and was at mag
about 19 on a blue plate taken May 18 UT with the 1.2-m Oschin
Telescope in the course of the second Palomar Sky Survey.  S.
Howell, Planetary Science Institute, reports that an observation
made June 3.15 UT with the No. 1 Kitt Peak 0.91-m reflector (300-s
CCD exposure) yields Harris V = 19.5 +/- 0.1; he gives the offset
(+/- 1".0) as 18".4 east, 2" south.  B. Leibundgut, B. Schmidt, and
R. Marzke, Center for Astrophysics, report that a CCD observation on
June 1.3 with the Mt. Hopkins 0.60-m telescope gives V about 18,
and a spectrum obtained the same night with the Multiple Mirror
Telescope confirms this as a type Ia supernova, closely resembling
the 1981 May 10 spectrum of SN 1981B and indicating an age for
SN 1990L of about 2 months past maximum.

     E. Belserene, Maria Mitchell Observatory, reports the following
mean measurement by M. E. Hunt of nine plates taken in 1962 of
N Sgr 1962:  R.A. = 18h27m39s.894 +/- 0s.031, Decl. = -24 03'15".00
+/- 0".32 (equinox 1950.0).  A plate exposed on 1990 June 1.30 UT
yields B [15.4.
     Visual magnitude estimates (cf. IAUC 5015):  May 17.87 UT, 12.1
(A. Pearce, Scarborough, W.A.); 18.07, 12.2 (P. Schmeer, Bischmisheim,
W. Germany); 19.03, 12.5 (Schmeer); 19.85, 12.5 (Pearce); 20.85, 12.9
(Pearce); 21.86, 13.3 (Pearce); 22.86, 13.6 (Pearce); 23.86, 13.8
(Pearce); 30.86, [14.2 (Pearce); June 1.86, [14.2 (Pearce).

COMET LEVY (1990c)
     K. Kwitter and A. Kagan, Williams College, report that spectroscopic
observations with the Steward Observatory's 2.3-m reflector (+
CCD) on June 2 UT show CN at 388.3 nm (about 50 percent of the
continuum strength) and CN 421.6-nm emission (about 0.10 to 0.12 of the
intensity of the 388.3-nm line) on a strong continuum.  No other
obvious emissions were detected over the range 350-500 nm.  Spectra on
June 3 yield CN with unchanged strengths.

1990 June 4                    (5028)             Daniel W. E. Green

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