[vsnet-alert 7487] Re: Nova Sgr 2002 No. 2: precise astrometry

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

Re: Nova Sgr 2002 No. 2: precise astrometry

> , with 102 UCAC1 reference stars (fitting error ~ 0".2).  It suggests
> that a GSC-2.2 star which Dr. Skiff and I mentioned is not a quiesient
> counterpart of the nova; no source can be seen on every DSS images
> within 3" from this position.

   This fiding makes a lower limit of the outburst amplitude of ~12 (or
possibly 13) mag.  This large outburst amplitude possibly qualifies this
object as a fast nova (although exceptions are always present).
The spcetrum by Christian Buil (vsnet-discovery-nova 90,
http://astrosurf.com/buil/us/nsgr2/nsgr2.htm) looks like a spectrum of
a premaximum nova close to its optical maximum.  Further spectroscopic
observation might reveal a dramatic change in a short time.

Regards,
Taichi Kato

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