Saturday 20 March 2010

Gyulbudaghian's brightening

Here is an image showing the brightening of Gyulbudaghian's variable nebula, located at RA 20h 45' 55" and Declination +67º 57' 45" in Cepheus. There is clearly more of the cometary looking nebulosity north of the star PV Cephei. The image is a stack of 57 30-second exposures at ISO 1600 and f/3 on the 20" scope, taken on 8th March 2010. But the processing used non-linear stretches and an artificially created and edited flat field to give the most pleasing picture, so in no way is it quantitatively calibrated. It looks wonderful in such a large format and it's nice to have sort of discovered something changing up there in the stillness of space!

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