Central Bureau for Astronomical Telegrams
IAUC 7015: 1998dy, 1998dz, 1998ea; N IN M31
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Circular No. 7015
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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SUPERNOVAE 1998dy, 1998dz, 1998ea
D. Reiss, University of Washington, reports that the Mount
Stromlo Abell Cluster Supernova Search Team (cf. IAUC 6639) has
discovered three apparent supernovae on V and R CCD images taken by
S. Sabine at the Mount Stromlo 1.27-m telescope (+ Macho Camera):
SN Date UT R.A. (2000.0) Decl. V Offset
1998dy Aug. 1 4 29 54.24 -61 12 43.1 19.0 --
1998dz Sept. 3 3 20 58.18 -41 05 22.8 18.5 --
1998ea Sept. 6 4 33 46.59 -61 35 20.4 19.5 5".9 W, 1".5 N
SNe 1998dy and 1998ea are near Abell 3266. SNe 1998dy and 1998dz
have no apparent host galaxy. SN 1998dy is also visible on frames
taken on Aug. 22, 28, and Sept. 9, and it is now fading; a
subsequent check of previous images shows that it was also present
on images obtained on July 14 (V about 19.0), but SN 1998dy was not
visible on similar images taken on 1998 Mar. 16 (limiting mag V
about 20.5) or Apr. 13 (limiting mag V about 20). SN 1998dz is
near Abell 3122 and was confirmed on images taken on Sept. 6, and
it appears to be rising in brightness; it was not visible on
similar images taken on July 14 (limiting mag V about 20.0) and
Aug. 22 (limiting mag V about 21.0). SN 1998ea was confirmed on
images obtained on Sept. 9, and it seems to be brightening; it was
not visible on similar images taken on Aug. 28 and 31 (limiting
mag V about 20.5). Finding charts are available at
http://msowww.anu.edu.au/~reiss/Abell_SNSearch/.
NOVA IN M31
E. Halderson, T. Shefler, M. Modjaz, J. Y. King, M. Papenkova,
W. D. Li, R. R. Treffers, and A. V. Filippenko, University of
California at Berkeley, report their discovery of an apparent nova
in M31 (NGC 224) during the course of the Lick Observatory
Supernova Search (cf. IAUC 6627) with the 0.8-m Katzman Automatic
Imaging Telescope (KAIT). The nova was found and confirmed
(unfiltered mag 17.8) on unfiltered CCD images taken on Sept. 15.3
and 16.3 UT, respectively. The object is located at R.A. =
0h42m46s.6, Decl. = +41o14'50" (equinox 2000.0; due to a lack of
nearby stars, this semiaccurate position was calculated as an
offset from the NED position for the nucleus of M31), which is
about 26" east and 78" south of the galaxy nucleus. A KAIT image
of M31 taken on Aug. 31.3 showed nothing at the position of the
nova (limiting mag about 19.0).
(C) Copyright 1998 CBAT
1998 September 17 (7015) Daniel W. E. Green
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