by Anthony Ayiomamitis
The large-amplitude short-period pulsating star GW UMa is a fast pulsating variable star with a period of 292.60 minutes and which involves a delta mag of 0.49 (V) magnitudes during this brief time interval. GW Ursae Majoris was discovered by the Hipparcos satellite and confirmed by Hintz et al to be monoperiodic with a constant period. Further details from the General Variable Star Search Gateway are available here whereas an AAVSO finder chart is available here.
Technical Details:
Date: Feb 11-12, 2011 @ 20:10 - 05:15 UT+2
Location: Athens, Greece (38.2997° N, 23.7430° E)
Equipment: AP 160 f/7.5 Starfire EDF, AP 1200GTO GEM, SBIG ST-10XME, SBIG CFW10, SBIG LRGB filters
Integrations: Lum @ 438 x 60 sec, Dark @ 10 x 60 sec, Flat @ ~ 24,200 ADU, Binning: 2x2, CCD @ -25.0° C
Further information: http://www.perseus.gr/Astro-Photometry-UMa-GW-20110211.htm