[vsnet-alert 11370] Re: Possible nova in Sagittarius: ASAS 180708-3346.6

[Hiroyuki Maehara]

 I have just performed CCD photometry of the object.
The object seems to have slightly brightened since the discovery.

 Follow-up observations (especially spectroscopic observations)
are required.

object            YYYYMMDD(UT)   mag      code
ASAS180708-3346.6 20090807.57499 6.44Ic   Mhh.VSOLJ
ASAS180708-3346.6 20090807.57587 6.95Rc   Mhh.VSOLJ
ASAS180708-3346.6 20090807.57692 7.43V    Mhh.VSOLJ
ASAS180708-3346.6 20090807.57833 8.03B    Mhh.VSOLJ
ASAS180708-3346.6 20090807.57991 7.35y    Mhh.VSOLJ



On Fri, Aug 07, 2009 at 14:16:14, Grzegorz Pojmanski wrote:
> Possible nova in Sagittarius: ASAS 180708-3346.6
> 
> Grzegorz Pojmanski, Dorota Szczygiel and Bogumil Pilecki of Warsaw 
> University Astronomical Observatory report:
> ASAS3V instrument of The All Sky Automated Survey (telephoto lens 200/2.8, 
> diameter 70mm + CCD + Johnsons V  filter, 3 minute exposures, pixel size 
> 14.8 arcsec, rms astrometric accuracy - 4  arcsec) 
> 
> has detected possible outburst of nova located at
> at RA = 18h 07m 08s  DEC = -33d 46'.6
> 
> Object was V=7.78 on August 06, 2009. Due to bad weather and technical 
> maintenance on our site we were unable to get more observations, but
> object was detected at the same positions on three exposures separated 
> by one minute.
> 
> Several faint sources are present close to this position in the DSS image and
> USNO-B catalog, so no progenitor could be suggested based on the ASAS 
> astrometry.
>  
> Observations 
>     DATE      UT                       HJD      V
> 04/08/2009 03:39:03 (Aug 04.152) 2455047.6568 invisible
> 06/08/2009 04:22:01 (Aug 06.182) 2455049.6865 7.78
> 
> Light curve and images can be found on
> http://www.astrouw.edu.pl/cgi-asas/asas_disc/180708-3346.6,5040
> 
> Regards, Grzegorz Pojmanski