Central Bureau for Astronomical Telegrams
IAUC 7006: 1998dr; 1998ds; 1998dt
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Circular No. 7006
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 1998dr IN ANONYMOUS GALAXY
J. Maza, Department of Astronomy, University of Chile, reports
the discovery of a supernova (B about 18.0) by Roberto Antezana on
a T-Max 400 film taken by L. E. Gonzalez with the Maksutov
telescope at Cerro El Roble on Aug. 28.270 UT. SN 1998dr is
located at R.A. = 0h09m30s.68, Decl. = -48o50'39".1 (equinox
2000.0), which is 0".7 north of the nucleus of the host spiral
galaxy. The new star is not present on a film obtained on July
31.310 (B > 20). SN 1998dr was confirmed by Maza at Las Campanas
Observatory using the 2.5-m du Pont telescope on Sept. 2; a
preliminary analysis of the spectrum shows this to be a type-Ia
supernova, relatively near maximum.
SUPERNOVA 1998ds IN ANONYMOUS GALAXY
Maza also reports the discovery of another supernova (B about
18.5) by Antezana on a film taken (as above) on Aug. 28.306 UT. SN
1998ds is located at R.A. = 3h17m19s.21, Decl. = -53o10'58".0
(equinox 2000.0), which is 9".9 west and 2".9 north of the nucleus
of the host spiral galaxy. The object is not present on a film
obtained on July 31.382 (B > 20). SN 1998ds was confirmed by Maza
with the du Pont 2.5-m telescope on Sept. 2; a preliminary analysis
of the spectrum shows this to be a type-Ia supernova, relatively
near maximum.
SUPERNOVA 1998dt IN NGC 945
T. Shefler, E. Halderson, M. Modjaz, J. Y. King, W. D. Li,
R. R. Treffers, and A. V. Filippenko, University of California at
Berkeley, report their discovery of an apparent supernova during
the course of the Lick Observatory Supernova Search (cf. IAUC 6627)
with the 0.8-m Katzman Automatic Imaging Telescope (KAIT). SN
1998dt was found and confirmed on unfiltered images taken on Sept.
1.4 (mag about 17.7) and 2.5 UT (mag about 17.3), respectively; it
is located at R.A. = 2h28m35s.72, Decl. = -10o32'59".8 (equinox
2000.0), which is about 23".1 west and 39".5 south of the nucleus
of NGC 945. A KAIT image obtained on Aug. 28.4 already shows a
hint of the supernova, but an image taken on Aug. 23.4 shows no
star at the position of SN 1998dt to a limiting mag of about 19.0.
(C) Copyright 1998 CBAT
1998 September 2 (7006) Daniel W. E. Green
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