[vsnet-alert 11172] Re: Possible dwarf nova: ASAS 150946-2147.7

[arne]

Grzegorz Pojmanski wrote:
> Possible dwarf nova: ASAS 150946-2147.7
> 
> 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 an object located at
> at RA = 15h 09m 46s  DEC = -21 47.7
> 
> This is the second outburst detected by ASAS at this position; the
> previus one was detected on 23/07/2003 and lasted over 30 days.
> 
> This ASAS position coincides with two 2MASS sources: 
> 15094657-2147462 J=10.536 H=10.357 K=10.294
> 15094589-2147446 J=14.890 H=14.508 K=14.544
> We suspected the fainter component of the blend being in outburst.
> 
Astrometry from BVRI data taken at Sonoita Research Observatory (SRO)
last night gives coordinates for the outbursting object of:

15:09:46.58 -21:47:46.3   J2000; +/- 0.1arcsec
V=10.40 B-V = 0.22

This coincides with the brighter of the two 2MASS objects.
The fainter object is visible in the R,I images and is not
in outburst.
Arne