[Aavso-photometry] [Fwd: AAVSO Special Notice #105: Possible Nova in Sgr]

[Shawn Dvorak]

I transposed the comparison and variable stars when processing.  The 
correct magnitudes at JD 54575.86 are:  b=9.976 and v=8.943.  This is 
more reasonable given the large amount of reddening that should be 
present in this region.

Shawn Dvorak (DKS)


> Observations this morning at JD 54575.86 showed the new object at 
> b=9.204, v=9.227, using TYC 6850 1118 (V=9.11, B=9.59) as a comparison 
> star.
>
> BTW: the object sits on the edge of a nice dust cloud in a very rich 
> field - a good view on deep images.
>
> Shawn Dvorak (DKS)
> Rolling Hills Observatory
>
>
> -------- Original Message --------
> Subject:     AAVSO Special Notice #105: Possible Nova in Sgr
> Date:     Sat, 19 Apr 2008 08:29:41 -0400
> From:     aavso at aavso.org
> To:     sdvorak at rollinghillsobs.org
>
>
>
> AAVSO Special Notice #105
>
> Possible Nova in Sgr
> April 19, 2008
>
> The CBAT Unconfirmed Observations Page listed
> a possible nova in Sgr.  After a call on VSNET-ALERT,
> Ernesto Guido and Giovanni Sostero (Remanzacco
> Observatory) used a robotic telescope near Mayhill, NM
> to confirm the new object (VSNET-ALERT 10077).
> They provide accurate coordinates (using UCAC2) as:
> 18:05:58.90 -27:13:56.3 J2000
> No magnitude is given by Guido and Sostero, but
> the original discovery magnitude was 8.4C on 20080418.
> No star close to this position is seen in the
> USNO-B nor 2MASS catalogs.  Kato (VSNET-ALERT 10075)
> indicates that this new outbursting object has
> a pre-discovery observation by ASAS:
> 20080416.3048 11.671V  (ASAS (Pojmanski, G. 2002, Acta Astron. 52,397))
> but was not visible 3 days earlier.
>
> While we recommend following this new nova as
> long as possible, please note that the field is
> near the galactic center and very crowded.  As the
> nova fades, it will be difficult to measure.
> We expect to get a photometric calibration as
> weather permits at SRO.
> Arne
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