[vsnet-chat 1199] SNe 1998dq and 1998X

[Yamaoka Hitoshi <yamaoka@rc.kyushu-u.ac.jp>]

cf. vsnet-chat 1195
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-chat/msg01195.html
cf. vsnet-chart 82
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-chart/msg00082.html

Dear SN watchers,

According to IAUC 6998, Australian amateur astronomer B. White has
visually discovered an apparent supernova in SBb galaxy NGC 6754,
which has also produced SN 1998X this March!  The new object, SN
1998dq, is located at R.A. = 19h11m23s.78, Decl. = -50o38'25".5
(2000.0), which is about 19" west and 5" north from the core of the
galaxy. This position is about 5-7" north from SN 1998X. 

SN 1998X was 17 mag on its discovery and was of type II.  On the other
hand, SN 1998dq was 14.3 mag around the discovery (Aug. 23.4), and
from its unusual blue (B-V about 0) color it would be on very early
phase of bright supernova.  From the recession velosity of the galaxy,
the expected maximum of typical SNe Ia on this galaxy would be 14.9
mag, while SN 1998dq is already brighter.  Further photometry and
spectroscopy (which has not reported) are strongly urged.

Such an event is rare as two supernovae appears in one galaxy on the
same year.  Recent example is SNe 1992R and 1992ac, which are produced
by MCG +10-24-007.

Sincerely Yours,
Hitoshi Yamaoka, Kyushu Univ., Japan
yamaoka@rc.kyushu-u.ac.jp

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