archive-1: SETI [ASTRO] Supernovae - SNe 1999B and 1999D
SETI [ASTRO] Supernovae - SNe 1999B and 1999D
Larry Klaes ( lklaes@bbn.com )
Tue, 19 Jan 1999 08:55:57 -0500
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>Date: Tue, 19 Jan 1999 19:44:10 +0900 (JST)
>From: Hitoshi YAMAOKA <yamaoka@rc.kyushu-u.ac.jp>
>To: isn_chat@mbox.queen.it, vsnet-alert@kusastro.kyoto-u.ac.jp,
> astro@lists.mindspring.com
>Subject: [ASTRO] SNe 1999B and 1999D
>Cc: yamaoka@rcsvr.rc.kyushu-u.ac.jp
>Sender: owner-astro@brickbat12.mindspring.com
>Reply-To: Hitoshi YAMAOKA <yamaoka@rc.kyushu-u.ac.jp>
>
>Dear SN watchers,
>
>There are two newly-discovered supernovae which are quite remarkable.
>
>The first one, SN 1999B, had been discovered by M. Schwartz. It was
>his 9th SNe discovery. Congratulations, Mike!
>
>Its discovery has been announced on IAUC 7086. The location is; R.A.
>= 12h11m16s.11, Decl. = +74o48'06".9 (2000.0), which is about 2" west
>and 20" south of the nucleus of the host galaxy UGC 7189. The host
>has a bright bar-shaped core and dim spiral arms (type SBdm), and the
>new star appears to be on the south-west edge of the disk. There are
>confusing three foreground stars (mag 13-14) around UGC 7189, so
>please the observer pay attention to identification. The discovery
>image can be seen at:
>http://www.ggw.org/asras/snimages/sn1999/sn99b1.html ,
>and the chart can be processed from the data:
>http://www.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-chart/msg00125.html
>
>SN 1999B was 16.9 mag in the discovery image taken on Jan. 14.29 UT.
>The spectrum of SN 1999B has been obtained by CfA group on Jan. 16.5
>UT(IAUC 6088), and it has been revealed that this is to be a type-II
>SN in somewhat early phase (with blue continuum). The recession
>velocity of UGC 7189 is very small (1683 km s-1; NASA Extragalactic
>Database), which indicate that SN 1999B can be glow some brighter
>(say, 15 mag or so) at its maximum. Further magnitude estimates is
>urged.
>
>Another one, SN 1999D, has been discovered by BAO survey on Jan 16.83
>UT. The host NGC 3690 is a colliding pair of galaxies, and has very
>disturbed shape. Remarkable to say, it has been produced four
>supernovae (including 1999D) and one possible radio supernova in this
>decade (!). The most recent one, 1998T, gave rise to the discussion
>about the identification and the naming of the host galaxy (see IAUC
>6859 = http://cfa-www.harvard.edu/iauc/06800/06859.html or my message;
>http://www.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-chat/msg00797.html).
>
>The location of SN 1999D measured by CfA group (IAUC 7089) is R.A. =
>11h28m28s.38, Decl. = +58o33'39".0 (2000.0). This SN appears to be
>the most western point source of NGC 3690 complex.
>
>The spectrum taken by CfA group revealed that SN 1999D is of type-II
>in very early phase. The expected maximum would be some 16 mag or
>a little more brighter.
>
>The discoverer reported that the new star was 15.6 mag on Jan. 16.83
>and was 15.3 mag on 17.65 UT. However, on the first inspection of CfA
>image taken on Jan. 18
>(http://cfa-www.harvard.edu/cfa/oir/Research/supernova/images/sn99d.gif),
>it is about 16.2 mag. The USNO-A2.0 based chart is available at:
>http://www.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-chart/msg00128.html.
>Followup photometry is also encouraged.
>
>Sincerely Yours,
>Hitoshi Yamaoka, Kyushu Univ., Japan
>yamaoka@rc.kyushu-u.ac.jp
>
