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Re: (cba:news) OT_J055924.1-512522 (new object in Pic)] (Joe Patterson) [2008-03-07T12:37:37Z]



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@xxxxxxxxx>
Reply-To: cba-chat@xxxxxxxxxxx
To: <cba-news@xxxxxxxxxxx>, <vsnet-alert@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx>, <AVSON@xxxxxxxxxxxxxxx>
CC: cbat@xxxxxxxxxxxxxxx, Hiroyuki Maehara <mira@xxxxxxxxxxxxx>
References: <E1JUDRZ-0002vT-Em@xxxxxxxxxxxxxxxxxxxxxxxxxxx> <20080227061206.GA19922%mira@xxxxxxxxxxxxx>


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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