[vsnet-chat 1220] Re: (fwd) On SN1998dm (Howerton) - by Larry

[Taichi Kato <tkato>]

Re: (fwd) On SN1998dm (Howerton) - by Larry

From lrobinsn@ix.netcom.com Mon Aug 31 09:25 JST 1998
Date: Sun, 30 Aug 1998 19:18:09 -0500
From: Larry <lrobinsn@ix.netcom.com>
Subject: Re: [vsnet-chat 1219] (fwd) On SN1998dm (Howerton)

Stan:

Actually the GSC is off.  The plotted position is shifted east a little from
the actual position.   You have the REal Sky you can see this easily.  There
is a bright star just east of the north end of the galaxy, but the supernova
is embedded in the southern end of the galaxy about at the end of the edge
on and southwest of the nucleus.  So that "star" you saw is probably the
supernova.   I have an image I took last night if you care to see just email
me and I will send it to you.  There is also an image posted somewhere, but
I forgot the url.





At 09:02 AM 8/31/98 +0900, you wrote:
>>From hwcomdso@horizon.hit.net Sun Aug 30 21:10 JST 1998
>From: "Stan Howerton" <hwcomdso@horizon.hit.net>
>Subject: Re: SN1998dm and SN1998dn images/charts
>Date: Sun, 30 Aug 1998 07:13:27 -0500
>
>I viewed MCG+01-04-044 at approximately 9:30 UT (4:30 a.m. CDT) August 30,
>1998 with a 13.1" (33.3cm) f/4.5 dobsonian at 202x.  After making a visual
>examination of the field, I have concluded there is some incorrect
>information as to the exact position of the galaxy MCG-01-04-044.
>
>The chart provided at the address listed below incorrectly positions the
>galaxy.  Furthermore, my software (Guide 6.0) also plots the galaxy at the
>same position (1h 26.319m, -6d 4.433m).  Both show a star (GSC 4684 1696 per
>Guide 6.0) in the south-southwestern tip of the galaxy when this star
>actually lies some 1/2' following the northeastern tip of the galaxy.
>However, an examination of the software RealSky reveals a position of
>approximately 1h 26m 14s, -6d 5m 44s for the galaxy.
>
>Others may make the same mistake I did this morning in believing there is a
>foreground star in the SSW tip and be frustrated in not being able to detect
>the supernova when, in fact, this star is probably the supernova.
>
>Thus if I am correct, the only star visible in the SSW tip of MCG+01-04-044
>is SN1998dm.  Since I mistook it for a foreground star I did not make an
>estimate of its brightness.  However, I had made a mental note that it was
>about 14.0 to 14.5 as I was wondering why this "foreground" star was much
>fainter than expected.
>
>Am I correct in my conclusion?
>
>
>
>>   Masao Funada has provided a GIF chart of SN1998dm
>>
>>  http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/SNe/sn1998dm/funada.gif
>>
>>Regards,
>>Taichi Kato
>>
>>
>
>
>
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