[vsnet-chat 750] (fwd) Re: (fwd) V17 in NGC5128 chart (Farrell)

[Taichi Kato <tkato>]

From lagmonar@csir.co.za Mon Mar  9 17:58 JST 1998
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Date: Mon, 09 Mar 1998 10:57:05 +0200
From: Berto Monard <lagmonar@csir.co.za>
To: tkato@kusastro.kyoto-u.ac.jp
Subject: Re: [vsnet-chat 746] (fwd) V17 in NGC5128 chart (Farrell)
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Hi Fraser and other interested observers,

It's good to have had a look at the posted chart : what one presently sees
through the telescope are three stars running into the centre of Cen A. The
outer star is 92 on the posted chart (91 on H/T), the middle one is the one
under investigation (V17?) at about 10.6 v (I 've never observed that star
before the alert and can't comment on its quiescent magnitude , see further...)
and a star very much in front of the famous dust band of Cen A which is around
12.5 (+ or - 0.5).
On the provided chart V17 is indicated as the fainter one (at N-E) of the two
'central' objects. In most scopes one will not be able to resolve those
components. What I wonder now is: do we see presently the indicated V17 which
must have brightened well beyound its companion or do we see the brighter one
of this pair in a brighter state (or as far I am concerned possibly in its
quiescent state)? According to the plot, the latter is very much in line with
the 92 and the 'dust' star, while the indicated V17 is well off line.  This
must be easily seen in the telescope and I will have a definite look at this
as soon the sky clears. I am under the impression that those stars lined up
quite precisely through the eyepiece and surely S Kiyota could comment on it!
Much depends off course on how accurate this chart shows the relative
positions. 
I am looking forward to the solution and eventual evolution of this
interesting 'event'.

By the way: does anyone knows something about the visual variability of the
'neighbour' radio galaxy NGC 5090?

Regards, 


Berto Monard / MLF
Pretoria
PS Yes, it rains!




>>> Taichi Kato <tkato@kusastro.kyoto-u.ac.jp> 03/07 4:17 AM >>>

G'day all,

The mysterious "V17-NGC5128" remains in a high state (~10th magnitude).
To avoid possible confusion with a genuine SN - and to encourage
further observations - I have put a chart online at:

http://vsnet.assa.org.au/vstars/v17-5128.zip 

This is an extract from Thompson & Bryant's Supernova Search Chart for
NGC5128 and should suffice for visual observations.  Despite its GCVS
name, V17 apparently is the northeast component of a double star in
front of NGC5128.

Do any SN hunters have some historical images, observing notes, etc of
V17 ?  An event was seen during 1996 February; and another during
observations of SN1986G.

Another 12th mag foreground star, "in" the dark band of NGC5128, has
also embarrassed a few observers!  ;-)


cheers,
Fraser Farrell

http://vsnet.dove.net.au/~fraserf/  email: fraserf@dove.net.au 
traditional: PO Box 332, Christies Beach, SA 5165, Australia

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