[vsnet-alert 18623] Re: ASASSN-15iz

[Brian Skiff]

On Fri, 2015-05-15 at 10:28 +0900, Taichi Kato wrote:
> ASASSN-15iz
> 
>    If this ID (high-proper motion star) is correct,
> the proper motion is (one of?) the highest among CVs,
> exceeding that of GP Com.  The object must then be
> a very unusual one deserving follow-up observations.
> 
> ASASSN-15iz 	--- 	------- 	13:12:13.26 	-42:18:0.4 	2015-05-11.27 	16.66 	SDSS 	DSS 	VIZIER 	------- 	CV candidate, most likely matches to a high-proper motion star with B=19.8, V>17.1 on 2015-05-08.1134962, V=16.7 on 2015-05-11.27, V=16.8 on 2015-05-12.15


     A look at all the available Schmidt plate-scans
suggests the large motion is spurious, and comes from 
various ill-defined blobs on the plates.
     I used the USNO-Flagstaff 'pixel server' for this:

http://www.nofs.navy.mil/data/FchPix

... which has the POSS-I 'Whiteoak extension' plate
from 1964, as well as three UK Schmidt IIIa-J (blue) plates
between 1975 and 1979, the ESO Schmidt IIIa-F (red)
plate (1984), and three UK Schmidt red plates from
1992 to 1994.


\Brian