Central Bureau for Astronomical Telegrams
IAUC 5102: 1990l; 1990ac; 1990ab
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Circular No. 5102
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
COMET MUELLER (1990l)
J. Mueller reports her discovery of a comet on 1.2-m Oschin
Schmidt Telescope plates taken by C. Brewer and J. D. Mendenhall
in the course of the second Palomar Sky Survey. There is a faint
tail to the west. Mueller provides the following positions:
1990 UT R.A. (1950) Decl. m1
Sept.24.35833 1 36 13.41 - 2 28 01.9 18
24.41389 1 36 12.20 - 2 28 16.7
25.35486 1 35 45.97 - 2 34 02.2
25.39306 1 35 45.21 - 2 34 11.6
SUPERNOVA 1990ac IN ANONYMOUS GALAXY
L. Pasquini and J. Melnick, European Southern Observatory,
La Silla, telex: "Preliminary analysis of a CCD spectrum (range
450-720 nm) of SN 1990ac obtained Sept. 26.3 UT with the New
Technology Telescope (NTT) indicate a clear type-Ia supernova
about one week after maximum. The redshift of the parent galaxy
was not determined, but the supernova Si II features (635.5, 597.2,
and 505.1 nm) appear redshifted by about 7800 km/s with respect to
the sun. Assuming a typical blueshift of 11 600 km/s for type-Ia
supernovae one week after maximum, this implies a redshift of z
about 0.065 for the parent galaxy."
SUPERNOVA 1990ab IN ANONYMOUS GALAXY
A. Moneti, L. Pasquini, and J. Melnick, European Southern
Observatory, report: "Preliminary analysis of a CCD spectrum (range
450-720 nm) of SN 1990ab (cf. IAUC 5096), obtained on Sept. 25.2 UT
with the NTT at La Silla, shows clear absorption of Si II (635.5 nm),
Na D (589.2 nm), and Fe II (553.5, 521.5, and 492.4 nm), indicating
a type-Ia supernova about three weeks past maximum. The redshift of
the host galaxy, determined from the Mg b (518 nm) and Na D (589.2
nm) absorption lines and from the emission lines of [N II] (655 and
658 nm) and [S II] (672 nm), is z = 0.034. No H-beta emission was
detected in the host galaxy spectrum. The expansion velocities of
the ejecta, derived from the difference between the rest wavelength
in the galaxy's frame and the minima of the absorption features, are
in the range 7500-9000 km/s."
1990 September 26 (5102) Daniel W. E. Green
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