[vsnet-alert 18641] MASTER OT J005559.13+594802.1

[Sebastian Otero]

http://www.astronomerstelegram.org/?read=7538

In ATel #7538, MASTER OT J005559.13+594802.1 was reported as a possible 
FUor/NC/NL object due to the fact that there is a 16.6 mag. (clear) source 
now (and the last three years) at 00h 55m 59.13s +59d 48m 02.1s which is not 
present in any DSS images.

However, we can find a very large proper motion star around this position, a 
nearby DC white dwarf called PM I 00559+5948 in 2013AJ....145..136L.
It is 2MASS J00555829+5948024.

In 2013 it was recorded in the URAT1 catalogue as URAT1 750-040630 at 00 55 
59.10 +59 48 01.8
I think it is also USNO-B1.0 1497-0031536.
Based on its magnitudes and positions, I think the star was recorded as 
follows:

1952 = 00 55 57.44 +59 47 57.6  USNO-A2.0
1976 = 00 55 57.51 +59 47 58.7  USNO-B1.0
1991 = 00 55 57.81 +59 48 02.9  GSC2.3
2000 = 00 55 58.29 +59 48 02.5  2MASS
2013 = 00 55 59.10 +59 48 01.8  URAT1
2015 = 00 55 59.13 +59 48 02.1  MASTER

So I don't think it is a variable star.

Cheers,
Sebastian

-----------------------
Sebastian Otero
VSX Team
American Association of Variable Star Observers


----- Original Message ----- 
From: "Brian Skiff" <bas at lowell.edu>
To: <vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp>
Cc: "Taichi Kato" <tkato at kusastro.kyoto-u.ac.jp>
Sent: Friday, May 15, 2015 12:11 AM
Subject: [vsnet-alert 18623] Re: ASASSN-15iz


> 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
>
>
>