[vsnet-alert 17191] Re: MASTER OT J175924.12+252031.7 - PossibleNova in Hercules (12.7m)

[Sebastian Otero]

>>> There are two red stars within 2" of the OT in SDSS. The brighter one
has more reliable magnitudes:
http://skyserver.sdss3.org/dr8/en/tools/explore/obj.asp?id=1237666229107819060
g=22.25 r=20.67 i=19.25 z=18.57

If you open SDSS image and click zoom (+) 3 times, one can suspect the
blue star hidden behind the brighter red dwarf at 4 o'clock (WSW)
direction:
http://skyserver.sdss3.org/dr8/en/tools/chart/chart.asp?ra=269.85084854&dec=25.34254633

So, there may actually be three stars where SDSS is seeing two! Then
WZ Sge scenario becomes not so impossible as I originally thought. <<<


Actually there are two red stars but the faintest one of them, 2.2" to the 
NW, is not in SDSS.
The second SDSS object is very blue and it is very likely the outbursting 
object as you point out. It is SDSS J175924.13+252032.8 at 17 59 24.14 +25 
20 32.9 (J2000.0, SDSS).

Cheers,
Sebastian

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




Also, keep in mind that the robotic photometry of MASTER unfiltered
images with the red zero point is often too bright by ~0.5m. If you
observe MASTER OT J175924.12+252031.7 in V band, I would expect ~13.2
magnitude rather than 12.7.

Denis

On Thu, Apr 10, 2014 at 3:11 PM, Patrick Schmeer
<pasc1312-aavso at yahoo.de> wrote:
> GALEX J175924.3+252032 (NUV 21.8 mag) is 2.7" from the new object:
> R.A. 17h59m24.31s  Decl. +25°20'32.5"  (J2000.0)
>
> Regards,
> Patrick