[vsnet-alert 14750] Nova Sgr 2012 No. 4 prediscovery image

[Denis Denisenko]

MASTER-VWF very wide field camera (D=70 mm f/1.2 + 11 Mpix CCD, scale
22"/pixel, FOV 16x24 deg) located in Argentina has obtained images of
the field centered at 18 15 59.3 -39 07 21 on 2012 July 07 at
04:46-04:51 UT, 7 hours before the discovery by Japanese observers.
Nova Sagittarii No. 4 is visible on the combined image. It was located
at 147 pixels from the southern edge of 4008x2672 CCD field (with the
larger side positioned along the North-South direction). Unfiltered
magnitude (with Tycho V zeropoint) at 20120707.200 UT was 7.8m. The
combined prediscovery image (600x600 crop) is posted at
http://master.sai.msu.ru/static/OT/NSgr2012-4-MASTER-Arg-precovery.jpg

Denis Denisenko on behalf of the MASTER team