Comets are worlds of ice and rock. Incredibly a machine made by man has now visited one. They are unpredictable, often promising naked eye visibility and then becoming fuzzy blurs. Still, one day we’ll get an amazing sight!
Comet C/2018 Y1 Iwamoto near clusters M36 and M38 in Auriga. The image is a stack of 21 x 30s frames at ISO 1600, taken using a William Optics GT81 with a 0.8x reducer/flattener.
Comet 46P Wirtanen. 13th December 2018. WO GT81 + 700D. 26frames of 25s at 1600
Cropped view of Comet 46P Wirtanen. 13th December 2018. WO GT81 + 700D. 26frames of 25s at 1600.
Image of Comet Lovejoy from January 10th 2015. The sky was only clear for short periods between rain clouds, but I managed to capture 10 x 90s frames at ISO 800. The image was stacked using Deep Sky Stacker’s “Comet mode”, with the option chosen to trail the stars and not the comet. The tails are very fine. When I initially stacked the frames without Comet Mode, the nucleus of the comet became a series of smudges each one slightly offset from the last, as it moved against the background stars. Deep Sky Stacker is a clever program!