Central Bureau for Astronomical Telegrams
IAUC 5687: 1993a; 1992bo; 1992bp
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Circular No. 5687
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@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)
COMET MUELLER (1993a)
Jean Mueller reports her discovery of a comet on a plate taken
during the course of the second Palomar Sky Survey with the 1.2-m
Oschin Schmidt Telescope, and provides the following positions from
trails. The object is condensed with a prominent coma and a faint
tail to the south.
1993 UT R.A. (2000) Decl. m1
Jan. 2.40833 9 46 45.34 +47 02 27.8 15.5
2.45347 9 46 42.62 +47 03 05.2
3.52708 9 45 28.25 +47 20 23.7
3.54792 9 45 27.11 +47 20 37.7
SUPERNOVA 1992bo IN ESO 352-G57
M. Hamuy, Cerro Tololo Interamerican Observatory, reports that
a spectrogram (range 320-750 nm) of SN 1992bo (cf. IAUC 5682),
obtained on 1992 Dec. 31 UT with the CTIO 1.5-m telescope, shows the
characteristic Si II 635.5-nm feature of type-Ia supernovae. The
minimum of the Si II absorption yields an expansion velocity of
about 10 500 km/s with respect to the galaxy's rest frame. This
spectrum shows resemblance to that of the type-Ia SN 1992A taken 1
day before maximum light. The spectrum of the parent galaxy's
nucleus yields a redshift of z = 0.019. Spectrophotometry yields
synthetic magnitudes B = 15.9, V = 15.8 (+/- 0.1).
M. Della Valle, European Southern Observatory; and K. Reinsch,
Universitat Sternwarte, Gottingen, report that inspection of CCD
spectrograms (range 380-960 nm, resolution about 2 nm), obtained on
Dec. 31.1 UT with the ESO/MPI 2.2-m telescope (+ EFOSC II) at La
Silla, show SN 1992bo to be a type-Ia supernova at maximum light.
The spectrum is dominated by strong absorptions of Si II (635.5,
597.2, 564.0, 545.4, and 412.9 nm), Fe II (501.8 nm), and Mg II
(448.1 nm).
SUPERNOVA 1992bp IN ANONYMOUS GALAXY
Hamuy also reports that a spectrogram of SN 1992bp (cf. IAUC
5682) obtained on Dec. 31 UT shows the characteristic Si II 635.5-
nm feature of type-Ia supernovae. The minimum of the Si II absorption
yields an expansion velocity of about 10 800 km/s with respect
to the galaxy's rest frame. This spectrum shows resemblance to
that of the type-Ia SN 1992A taken seven days after maximum light;
the parent galaxy has z = 0.080.
1993 January 4 (5687) Daniel W. E. Green
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