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[vsolj-alert 97] SN 1998bm



山岡@九大理 です。

またまた近めの超新星です。IAUC6882によると、Lick天文台のグループが発見
した超新星1998bmですが、母銀河はおとめ座銀河団のおよそ1.5倍遠いだけで、
II型ですが15等前後が期待できます。

小さい銀河群の中の小さい銀河(それも特異銀河)なので、お見間違えのないよ
う(^^;)。Lickの発見画像(http://astron.harvard.edu/~bait/sn98bm.html)が
参考になると思います。私が見た時には裏返っていましたが。

以下にvsnet等に投げた情報を添付します。

Dear SN fans,

  As reported on IAUC 6882, another nearby supernovae had discovered
by Lick Observatory SN search team. This SN, named as 1998bm, was
discovered on Apr. 21.2 UT when it was 17.6 mag (unfiltered CCD). It
rose to 17.4 mag on 22.2 UT. The position is given as R.A. =
9h21m30s.49, Decl. = +64o14'25".4 (2000.0). Spectroscopy tells that it
is of type II.

  The host galaxy IC 2458 is a peculiar one, which has another name 
Markarian 108. On DSS2 image, it looks like a small galaxy in a group,
which involves NGC 2820 and 2844. NED gives a name as NGC 2820A to
this host galaxy. The location of SN (above) is about 1" east and 5"
north measured from the brightest knot of IC 2458. 

  These galaxies seem to be not-so-faraway ones: according to Turry's
Nearby Galaxy Catalog, their distances are about 1.5 times further
than Virgo cluster, which imply that typical SN II would be about 15
mag or so at its maximum. Further photometry is encouraged.

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


			九州大学(六本松地区)理学部物理学教室  山岡  均
			〒810-8560 福岡市中央区六本松4-2-1
			yamaoka@rc.kyushu-u.ac.jp

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