Any way to identify this

[pmrid (Peter)]

I suppose it's an asteroid. But since I haven't encountered this in an image sequence before I thought it may be a good opportunity to learn something more about them.
I was doing an image sequence on M20 last night (25th June) between about 7.30 and 10.30 taking 10-minute subs in Ha, O3 and SII. I happenied to be scanning some of the Maxim raw subs and thought I detected movement. And sure enough, there it was.
It shows up in the O3 and SII subs but not the Ha - possibly swamped by the intrinsic brightness of Ha. But here are some crops from the O3 and SII subs that I have marked with the time of the subs.
I can only attach 8 JPGs at a time here, it seems, so I'll put the remainder in another message.

I wonder how one goes from here to track down an object sich as this.
Peter

[gbeal]

Absolutely no idea Peter, but have you tried a "movie" animation, to show the movement?
Gary

[pmrid (Peter)]

Her's the remainder of the sequence.
I was imaging through an EdgeHD1400 at 3900 (F11) with an ATIK11002M.
Peter

[multiweb (Marc)]

Could be a dust mote on your optics. Are you flat fielding?

[pmrid (Peter)]

Originally Posted by multiweb

Could be a dust mote on your optics. Are you flat fielding?

Hi Marc. Nope. Not a dust mote - it moves in a precisely linear way from sub to sub and in a sub, you can see the elongation due to the length of the exposure. It's definetely "out there" and not inside the scope.
Peter

[pmrid (Peter)]

Originally Posted by gbeal

Absolutely no idea Peter, but have you tried a "movie" animation, to show the movement?
Gary

Beyond my computer skills I'm afraid.
Peter

[von Tom (Tom)]

Hi Peter - what ever that is it's well spotted! Here's my go at animating one set.

Cheers,

Tom

[CometGuy]

Peter,

This is problably asteroid (4520) Dovzhenko. Try the Minor Planet Checker here:

http://mpcapp1.cfa.harvard.edu/cgi-bin/mpcheck.cgi

Terry

[mithrandir (Andrew)]

CdC says your most likely object would be 4520 Dovzhenko at mag 14.9

Parameters from MPCORB

04520 13.0 0.15 K1128 263.62768 258.43991 94.46119 4.26138 0.2201549 0.28736552 2.2742923 0 MPO169569 814 17 1955-2009 0.58 M-v 38h MPCADO 0000 (4520) Dovzhenko 20091216

[pmrid (Peter)]

Originally Posted by mithrandir

CdC says your most likely object would be 4520 Dovzhenko at mag 14.9

Parameters from MPCORB

04520 13.0 0.15 K1128 263.62768 258.43991 94.46119 4.26138 0.2201549 0.28736552 2.2742923 0 MPO169569 814 17 1955-2009 0.58 M-v 38h MPCADO 0000 (4520) Dovzhenko 20091216

Thanks guys. I guess I need to load some asteroid data into CdD.
Peter

[mithrandir (Andrew)]

For extra credit see if you can get this one.

2123 Vltava (mag 15.5) should be very close to the centre of M8 on July 3 at about 01:30. The track dots are every 30 mins.