Central Bureau for Astronomical Telegrams
IAUC 4212: 1986F; NGC 3226; 1982i
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Circular No. 4212
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 617-495-7244/7440/7444
SUPERNOVA 1986F IN NGC 5253?
R. H. McNaught reports the following precise position of this
presumed supernova (IAUC 4206), measured by him from a plate taken
by A. Savage with the U.K. Schmidt on Apr. 28: R.A. = 13h37m05s07, Decl. =
-31deg23'14"0 (equinox 1950.0). The position measured is the
brightest part of the H II region A (Campbell and Terlevich 1984,
M.N.R.A.S. 211, 15). Approximate offsets are 3" east and 6" north
of the center of the galaxy, which is assumed to be midway between
the Campbell-Terlevich H II regions B and C. Visual magnitude
estimates by T. Cragg and others on Apr. 24 (mag 13) and by McNaught
on Apr. 25 and 27 (mag 13.5) were of an object of stellar appearance,
but difficult and requiring high magnification, and possibly
the H II region itself. Several other observers have attempted
spectroscopy, but no definite supernova has been detected.
NGC 3226
U. C. Joshi, A. K. Sen, M. R. Deshpande and A. K. Kulshrestha,
Physical Research Laboratory, Ahmedabad, report: "Linear
polarization observations of this galaxy in the R band on Mar. 18
with the Kavalur 1-m telescope suggest rapid fluctuations (within
50 min) in polarization between 1 and 10 (+/- 1) percent and between
50 and 155 deg. The polarization amount and angle showed a negative
correlation. The brightness of the galaxy was almost constant."
PERIODIC COMET HALLEY (1982i)
T. R. Geballe, F. Baas and D. M. Walther, U.K. Infrared
Telescope, report: "A spectrogram was obtained on Apr. 25 at a resolving
power of ~ 400 of the broad 3.4-micron emission feature observed
at lower resolution by Wickramasinghe and Allen (IAUC 4205) and
others. The emission extends from ~ 3.25 to ~ 3.54 micron, with the
brightest and broadest peak occurring near 3.36 micron. There are
other less prominent peaks at 3.28 and 3.52 micron and, in addition, a
great deal of spectral substructure. At this resolution the
emission feature does not closely resemble any previously observed
absorption or emission feature in any astronomical object."
Further total visual magnitude estimates: May 4.15 UT, 4.8
(D. W. E. Green, 7 x 35 binoculars, Northfield, MN); 5.12, 4.9
(Green); 5.86, 5.5 (J. Campos, Durban, R.S.A., 0.13-m refractor);
6.78, 5.5 (Campos, faint tail 2.0 deg long in p.a. 104).
1986 May 8 (4212) Brian G. Marsden
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