I was lucky and in the skies visible from my terrace appeared comet with poetic name C/2015 V2 (Johnson). Right now (2015-05) is slowly moving through the constellation Bootes not far from bright star Arcturus and it is “only” 120 million kilometer from Earth.
Because the comet moves differently compared to the background stars, one has two options how to photograph it. Either the telescope is pointed on stars and the comet is slowly drifting from the field of view or the telescope is pointed on the nucleus of the comet and due to the longer exposures the stars are trailing. I picked the second variant, in order to have the comet sharp. 3 minute exposures the stars are trailed into the oval shapes, but the comet is focused:
|Telescope:||Newton 254/1000 mm|
|Focal length:||730 mm|
|Autoguiding||Orion Mini Autoguider|
|Camera:||ZWO 1600 MC|
|Filters:||IR UV cut|
|Exposure:8x||60x180 s, bin 1x1|