(cba:news) OT_J055924.1-512522 (new object in Pic)]

Joe Patterson jop at astro.columbia.edu
Fri Mar 7 07:37:20 EST 2008


Dear CBAers,

I guess you all read Berto's message today.  I had ignored this guy 
since it seemed a touch too red, too faint (at quiescence), too 
uncertain, too south.... But Berto's photometric wave changes that.
This is definitely a prime target for however long it stays visible in 
our little telescopes.

On an unrelated note, I thought I'd mention three upcoming meetings 
where CBAers will be in attendance. (1) the spring AAVSO meeting in 
England; (2) the late-May SAS meeting in Big Bear lake, CA (discussed by 
Jerry Foote); (3) the fall AAVSO meeting in Mass (I think); (4) the 
January meeting in Hawaii.  I am definitely going to (4), and likely to 
either (2) or (3).  We're not planning anything formal, but I'd like to 
know who plans to attend any of these... and I'm sure other CBAers would 
too.

joe


-------- Original Message --------
Subject: (cba:news) [vsnet-alert 9936] Re: OT_J055924.1-512522 (new 
object  in Pic)
Date: Fri, 07 Mar 2008 14:13:26 +0200
From: Berto Monard <lagmonar at nmisa.org>
Reply-To: cba-chat at cbastro.org
To: <cba-news at cbastro.org>, 
<vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp>, <AVSON at yahoogroups.com>
CC: cbat at cfa.harvard.edu, Hiroyuki Maehara <mira at cetus-net.org>
References: <E1JUDRZ-0002vT-Em at luna.kusastro.kyoto-u.ac.jp> 
<20080227061206.GA19922%mira at cetus-net.org>


The optical transient in Pictoris was observed over three hours last 
night at CBA Pretoria. This is two weeks after the initial detection.

The following approximate magnitudes where derived on mid time UT 
20080306.77:

B=15.8 (+/- 0.15)
V=15.7 (+/- 0.1)
R=15.6 (+/- 0.1)
I=15.8 (+/- 0.15)

Timeseries photometry with unfiltered CCD show a modulation in the light 
curve with period around 1.5h and amplitude of 0.15 .

This object is very likely an outbursting dwarf nova (ugsu) and not a SN 
as might be initially derived from its directional nearness to a side-on 
galaxy, which is probably a bit too far out for the measured brightness 
of the object.

Further observations will be attempted.

Berto Monard
Bronberg Observatory / CBA Pretoria













///

On Wed, Feb 27, 2008 at 12:58:57PM +0900, Taichi Kato wrote:
>   According to CBAT's "Unconfirmed Observations Page", a possible
> transient has been reported in Pic.  mag = 13.3R at 055924.1 -512522

In the USNO B1.0 catalog, there is a faint object at the reported position.

USNO-B1.0 0385-0053065  05 59 24.07 -51 25 22.0 B2mag=21.13 R2mag=20.58




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