Scooot

No it’s my camera, much more sensitive in the middle. Flats deal with it.

I’m imaging as we speak, got about 50 one minute subs so far. This is a screenshot of the last sub from Asiair.

You and Marvin have inspired me to have another go, I think I should be able to get the comet & NGC 1647 in the same fov as well.

Any tips, not sure I’m qualified to give tips but thanks for the compliment. 😀 It’s further away than when I imaged and after looking at its movement on Sky Safari tonight it doesn’t seem to be moving across the sky so much relative to the tracked stars so you can probably get away with longer subs than me, from that regard?

Yes very 😀 19km per second that evening. Thank you Reggie

No Star trails in a Comet image is a great result.

My PC didn’t like processing 411 20 second subs but I’ve finally finished it. Taken with my 2600MC pro and baby Tak at zero gain, processed in Pixinsight. The framing’s not that good because I thought my camera was up the other way and I had intended to allow plenty of room for the comet to move. 🙄 The 2nd Image shows the Comet path to the right and how far it moved over the Sky over the 2.25 hours of imaging. I'm showing the comet before it moved to the right.

Oh I see thanks. I just worked through your formula using Pythagoras and arrived at 21,277 so very close to Sky Safari. Adjusting for the 80° North makes sense now so thanks for explaining.

Great, I’ll give that a go thanks. What’s v in the formula?

Lovely image. I just used Sky Safari and fast forwarded a minute to see how much the Comet’s RA and Dec changed. Dec changed the most on the night I imaged (8.6” over a minute) and as my imaging scale is 2.06 arc per pixel I estimated 20 seconds would be ok. Got to process them now, about 500 before I thin the numbers down.

Ah that makes sense, thanks very much. I started looking at it because I wanted to assess the exposure I could take as I knew the comet was travelling very fast and one thing led to another Over the course of a minute the RA didn’t change much at the time I was about to image but the Dec changed by about 8.6”. I just used Sky Safari to fast forward the time by a minute to work it out. As my kit images at 2.06 arc second per pixel i guessed I’d be ok at 20 second exposures without the comet trailing. Probably could have got away with longer but that’s what I decided to do in the end and the subs seem to be ok. Don’t know if this is the simplest way to work it out, or even if it’s right but I’ve got a bunch of subs to process Anyway, thanks again.

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Many thanks Keith, I have the answer, I was just wondering how they arrived at it, but it sounds too difficult from your reply.

Hi all, given the R.A. and Dec apparent motion I’ve been trying to work out how Sky Safari arrived at the Total apparent motion. I originally thought I could use Pythagoras and then realised seconds of arc are not the same as seconds, so allowed for that, but I’m still failing. I guess it’s more complicated than I imagined but I’m now curious. Can anyone enlighten me.

Hi Peter, that’s another smashing image. I’m going to have a go at this using my baby tak and the same camera if I get a chance. I was wondering what time interval you used in between the subs?

Cracking images Mark.

Two Mars to show the direction of travel. I took some short videos using the Asiair, my 60mm Tak and Asi2600MC pro. I used ASIStudio for the first time to stack the avi files, then did separate stacks to get Mars in focus. I combined the images using masks and pixelmath in Pixinsight. Took me a while to work out how to do it. It’s not the sharpest image of the moon but not bad for a 60mm scope so I’m quite pleased with it as a record of the event.

Great set Reggie.

Love that, it’s fantastic. Great seeing the moon & stars.

A couple of single shots from this morning with my baby Tak. I have a short video avi file as well but not sure how to process that

Great results.

They’re great.

That’s a cracker Harvey. 😀

That’s another cracker Harvey. I like the colours.

Wonderful images.