Wrong telescope for a comet of this size (8 degree – only 0.5 degree FOV) but came out quite well. Surprising colour combinations – green coma expected, red tail not. Cloned out the trailed RGB stars in PS.

Object IDC/2020 F3 NEOWISE
Details2020-07-18 23:22UT
Telescope250mm f4.8 Newtonian
CameraAtik 460EX @-15C
Exposure(s)5×30 each RGB
ProcessingSiriL, DSS, Photoshop
20 July 2020|Comets, News|

Comet 21P/Giacobini-Zinner brightening and tail developing

Tail starting to develop and definitely getting brighter

Object ID21P/Giacobini-Zinner
Details2018-08-16 22:09:30 – 22:23:23 UT
Telescope200mm Newtonian f5
CameraZWO ASI290MC
Exposure(s)20 x 15s, 30s delay between exposures
ProcessingNebulosity, Photoshop
17 August 2018|Comets, News|

Comet 21P/Giacobin-Zinner animation

Moving through the constellation of Cassiopeia

Object ID21P/Giacobini-Zinner
Details2018-08-03 22:12 – 22:25 UT
Approx. mag. 9
Telescope200mm Newtonian f5
CameraZWO ASI 290MC
Exposure(s)20 x 10s exposures, 30seconds apart
21P gif animation
4 August 2018|Comets, News|


2010-09-07 21:00 UT
200mm f5 Newtonian SW LPR MPCC
Canon EOS 350D Guided
5x60s 5x90s 3x120s subs darks ISO 800
Processed in Nebulosity, PhotoShop CS5
Also 1 frame to show comet against star field without trailing.

From Wikipedia: Comet Hartley 2, officially designated 103P/Hartley, is a small periodic comet with an orbital period of 6.46 years. It was discovered by Malcolm Hartley in 1986 at the Schmidt Telescope Unit in Siding Spring, Australia. Its diameter is estimated to be 1.2 to 1.6 km. It will be the subject of a flyby by the Deep Impact spacecraft on November 4, 2010, with a closest approach of 700 kilometers. This is part of the EPOXI mission.

And here’s NASA’s view of it from the EPOXI mission.

8 October 2010|Comets, News|