Comet 9P - what goes around...

Blog the previous nights viewing. Link to images on the gallery or simply describe what you observed the night before. Leave the technical and howto in another forum.
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rwilkinson
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Comet 9P - what goes around...

Post by rwilkinson » Tue Mar 29, 2016 7:32 am

Back in 2005, I managed to get an image of faint comet 9P/Tempel, around the time that it was visited by the NASA Deep Impact probe (which blew a small hole in it, to investigate its composition).

Now, eleven years later we're encountering it again on its next orbit. It's only 13th magnitude at the moment, but well-placed in Leo, so I took the opportunity to look for it during last night''s clear spell, whilst trying out two different imaging systems:
9p_80ed_28mar.png
Comet 9P on 28-Mar-2016. 4x 1-min with MX716 on 80ED at f/3.8
9p_80ed_28mar.png (247.43 KiB) Viewed 3299 times
9p_c8_28mar.png
Comet 9P on 28-Mar-2016. 5x 1-min with MX716 on C8 at f/4.3
9p_c8_28mar.png (200.47 KiB) Viewed 3299 times
This is the first time that I've seen a comet twice, on successive orbits.
Here's my picture from 2005 (when it was 10th magnitude):
9p_may2005.png
Comet 9P in May 2005, using MX5C on C8 at f/3.3
9p_may2005.png (109.63 KiB) Viewed 3297 times

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rwilkinson
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Re: Comet 9P - what goes around...

Post by rwilkinson » Fri Apr 01, 2016 8:33 am

I managed a much longer imaging run last night from Bury, with my 70mm refractor mounted on Carl's little NexStar AZ mount.
This comet is still only 13th magnitude, and moving very slowly across the sky (so the background stars have trailed very little over the course of an hour):
9p_31mar.png
Comet Tempel on 31-Mar. 63x 30-sec with HX916 on 70ED at f/4.1
9p_31mar.png (170.02 KiB) Viewed 3250 times

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