C2012/S1 ISON in Auriga, on April 22 8:54pm PDT (April 23, 03:54UT). The comet is near the center of
the frame with a short tail visible. The bright star below the comet is TYC 1892-589-1 (HD 47291)
with a visual magnitude of 8.18. Imaged with CCD Lab’s Q285M camera and a Celestron EdgeHD 9.25 at
f10, on a Losmandy G11/Gemini mount. The field of view is approximately 13 x 10 arc minutes. The L
subframes were 3 minutes for a total exposure of 57 minutes (from 8:54 pm to 9:51 pm). Captured with
Nebulosity, calibrated and sigma combined in Iris with other processing using PixInsight LE and
Photoshop CS. North is up.