[vsnet-alert 1672] Re: SN 1998an

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

Dear all,

> I will check the distance estimate as well

I have checked some galaxy catalogs which involve the recession
velocity, but they gave completely the same value (5623 km s-1). This
can be a result that all of them refer the same paper (CfA catalog
refers Focardi et al., A&A 161, 217). 

UGC 3683 could be a member of the cluster ACO 569. The center of ACO
569 locates 7h09m.2, +48 37 (2000.0), and its z = 0.0196 according to
ACO catalog, which is very comparable to that of this galaxy. UGC 3683
is about 2.5 deg south and 1m (0.2 deg) west of the center of the
cluster (Thanks to Dr. Skiff for the location of the host galaxy!). 

There are many galaxies in this neighbour; whose recession velocities
are fairly near to 6000 km s-1 according to RC3. Then I guess the
distance of UGC 3683 seems to be able to estimate from its recession
velocity. There is no reason to think that UGC 3683 is not a member of
ACO 569.

Then, SN 1998an is about 5 (not smaller than 4) times beyond compared
with Virgo. The typical type Ia SN on 4 times beyond Virgo would be
15.3 mag at maximum (average SNeIa in Virgo = 12.3 mag). Poyner's
estimate is greatly exceeded this value. Peculiar SNeIa (c.f. 1991T)
can be brighter than normal SNeIa, so I think this SN should be
noteworthy.  

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

P.S. Some persons pointed me out that the discoverer of SN 1998an is
really an amateur astronomer. Thank you for notices and
congratulations again, Ron!

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