Central Bureau for Astronomical Telegrams
IAUC 5164: 1991c; 1991B; HD 50138
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Read IAUC 5165
Circular No. 5164
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
PERIODIC COMET SWIFT-GEHRELS (1991c)
S. Nakano, Sumoto, Japan, reports the recovery of this comet by
T. Seki, Geisei, as given below. The comet is diffuse with central
condensation. The indicated correction to the prediction on MPC
13045 (ephemeris on MPC 16449) is Delta(T) = +0.06 day.
1991 UT R.A. (1950) Decl. m1
Jan. 7.39167 22 12 00.12 - 5 30 29.5 16.5
7.41500 22 12 03.56 - 5 30 02.4
12.40747 22 25 42.59 - 3 59 01.4 17.0
13.38924 22 28 26.18 - 3 40 44.4 17.0
13.39896 22 28 27.58 - 3 40 30.7
13.41042 22 28 29.68 - 3 40 17.5
13.42326 22 28 31.79 - 3 40 02.5
SUPERNOVA 1991B IN NGC 5426
M. M. Phillips, Cerro Tololo Interamerican Observatory, reports
that a spectrogram of SN 1991B obtained by Mario Hamuy with the CTIO
1.5-m telescope on Jan. 15.35 UT shows that this is a type-Ia
supernova about 20 days past B maximum.
HD 50138
Y. Andrillat and L. Houziaux, Observatoire de Haute-Provence,
"This B[e] object (HD 50138 = MWC 158) seems to have undergone an
important new shell phase. On CCD spectrograms (range 757-955 nm,
resolution 0.13 nm) obtained at Haute-Provence Observatory, line
features differ markedly from 1990 January observations. The double
symmetrical O I emission at 777.3 nm shows, on 1990 Dec. 29, an
inverted P-Cyg profile with emission of 1.11 and a deep absorption of
0.76 in terms of the local continuum with m(777) = 8.11. Double
emission Paschen lines from P9 to P22 indicate a red-shifted absorption,
while the V/R ratios present important changes. O I 844.6-nm
emission peaks at twice the local continuum, m(845) = 7.52, while
the 926.5-nm line is absent."
1991 January 15 (5164) Daniel W. E. Green
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