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Announcements & News => Astronomy & Science => Topic started by: Ivan on January 10, 2015, 11:05:06 PM

Title: comet lovejoy
Post by: Ivan on January 10, 2015, 11:05:06 PM
Comet lovejoy is pretty easy to spot at the moment.

Assuming I'm looking at the right object, if you pretend that the horns of Taurus are an arrow (looks like a big 'V' in the sky) - they point to a bright start about the same distance away as the height of the 'V'. The comet is "slightly down and right of this star". Looks like a round fuzzy blob. I could just about make it out with naked eye, but it's easy to spot with a pair of binoculars. Looked pretty impressive through my 6" refractor, but took me ages to find it. As I was in the neighbourhood, I checked out the Orion nebula at the same time and was rewarded with the best view I'd ever had of it.

Title: Re: comet lovejoy
Post by: desperate on January 11, 2015, 09:33:56 PM
A 6 inch refractor, wow, is it a doublet or a triplet objective? and focal length? either way it would be a pretty impressive instrument to put a camera on. You could get an adaptor for your DSLR for about twenty quid and then with a remote or timed setting click away,, point it at jupiter or the comet and see what you get.


Title: Re: comet lovejoy
Post by: Ivan on January 14, 2015, 01:21:19 PM
Can't remember the spec - I think it's got the extra lens(es) to correct chromatic aberration - there certainly doesn't seem to be any - nice crisp white images. It's long (1200mm focal length or possibly longer). It's on an EQ5 mount, but because of the length of the telescope, it's actually quite wobbly. One day I'll half-bury an RSJ in half a ton of concrete and make up a mount - maybe based on wheel bearings. I probably don't have a camera good enough for astro-photography and I don't have any motor drive. I should definitely try Jupiter again, as we've got less light pollution than at the previous house (three moon shadows event coming up soom, I heard on TV the other night)

Title: Re: comet lovejoy
Post by: AndrewE on January 15, 2015, 04:53:11 PM
Brother Jim says: "Best image I've seen yet:"

Title: Re: comet lovejoy
Post by: Ivan on January 18, 2015, 04:22:18 PM
Quite unlike any other comets I've seen. Why is it green?

Title: Re: comet lovejoy
Post by: desperate on January 18, 2015, 04:30:28 PM
It'll be ionised Nitrogen ( I think) in the tail, although a lot of amateur astrophotographers use rather a lot of image manipulation that can introduce some false colouring into the finished image. Mind you I am pretty sure Damian Peach is well aware of the issue and is one of the most skilled imagers in the business.