[vsnet-alert 14596] Tycho-2 8950-00145-1 in Carina

[Rob Kaufman]

A query because this star isn't in AAVSO's VSX and I can't find any
reference to variability within the limited resources I'm familiar with.
AKA NOMAD1 0257-0145462, USNO-B1 0257-0143923, UCAC2 3451623, Vmag 10.55.
I picked it up in blinking.  On 15 May it showed as a bright star around
the quoted magnitude, but last night (16 May) it was completely absent from
3 frames taken over about 7 mins, with limiting magnitude around 12.5
(unfiltered DSLR).  Here's a link to an animation:
http://i727.photobucket.com/albums/ww271/Rob_Kau/Tycho-28950-00145-115-16May2012anim.gif


This is a new area of sky for me and I don't have an archive of images to
check for previous variability.  Would greatly appreciate advice as to
whether it's a known variable (eclipsing binary?) - thanks.

Cheers -

Rob Kaufman (KBJ)
Bright, Victoria, Australia