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IAUC 5452: 1992G; N Sgr 1992; HD 37258; 1991g1

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                                                  Circular No. 5452
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

     H. Kosai, National Astronomical Observatory of Japan, reports
the discovery by Shunji Sasaki, Hasaki-machi, Ibaraki, of an apparent
supernova (mpv about 14) in NGC 3294, found on T-Max 400 film
exposed Feb. 9.60 UT.  Y. and R. Kushida, Yatsugatake South Base
Observatory, provide the following precise position for SN 1992G from
a photograph taken Feb. 14.54:  R.A. = 10h33m26s.19, Decl. =
+37 34'47".4 (equinox 1950.0); the offsets from the galaxy's nucleus
are 27" east and 10".5 south.  A measurement of S. Sasaki's discovery
film by G. Sasaki, National Astronomical Observatory, yields end
figures 26s.49, 51".6.  No stellar image appears at this location on
the Palomar Sky Survey or on the Lick Photographic Atlas.  Further
magnitude estimates:  Feb. 7, [13-13.5 (R. Kushida, visual); 13.75,
about 14 (S. Sasaki, T-Max 400 film); 14.54, about 13.5 (Y. and R.

     R. H. McNaught, Anglo-Australian Observatory, reports the
following precise position measured from an Uppsala Southern Schmidt
telescope film:  R.A. = 18h06m28s.84, Decl. = -25 52'33".3 (equinox

HD 37258
     C. Corbally, Vatican Observatory; and R. Gray, Appalachian
State University, report:  "Spectrograms (range 370-490 nm, resolution
0.29 nm) taken with the Steward Observatory 2.3-m telescope
show that HD 37258 (V586 Ori) was clearly a shell star in 1989 Sept.
with an MK spectral type of 'kA3mA1 shell', whereas the shell features
had mostly disappeared by 1991 Nov. when the spectral type was
'A1 Van (shell)'.  In the earlier spectrum, the hydrogen line cores
are narrow and deep, in fact deeper than seen in normal stars of
type A3 V; in the later spectrum, the classic shell cores have given
way to those of a fast rotator.  The metal lines show a similar
change from a shell to a more normal pattern.  Photometry cited by
Bibo and The (1991, A.Ap. Suppl. 89, 319) has indicated a Herbig
Ae/Be type of variability for this star."

     Total visual magnitude estimates by G. W. Kronk, Troy, IL:
Feb. 1.02 UT, 7.9 (20x80 binoculars); 8.02, 8.1 (0.33-m reflector).

1992 February 15               (5452)             Daniel W. E. Green

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