(2021-10-07, 01:29 PM)bigmasterdrago Wrote: Amazing work! I love these puzzles. It would help greatly to know the UT of the image? AEST looks to be ahead of UT by 10 hours. Correct? I'm assuming you took the image after Astronomical Twilight, so 19:11 AEST when it would be high in the east. Or waited til it transited around 22:00 local. Best I can tell, south is up and east to the right. I suppose it is possible that orbital elements for Christophe have changed in 2 months but somehow I doubt it by several hours. I have the large rock at RA 23 28 29 DEC -4 40 30.1 at 22:19 local time 67° high due north using JPL elements with epoch date JD 2459396.5 (July 1, 2021). This places Christophe 12.3' WNW of Neptune. Did you try updating the asteroid elements within ST?
Just for grins, I used an element set from July 2021 that I had laying around and the position was off by ~16" in RA and 8' in DEC. This does seem to be close to the error shown in your image.
Looking again at the trail in your image of Christophe, it appears the image may have been taken between 14:53UT and 17:53UT, just eyeballing it.
Whoops - I keep falling into the trap of thinking that the exposure details are recorded within the JPG file like the EXIF data in my Canon camera.
Here are the details for Sunday Oct 3rd Brisbane:
30 Sec Frames (x60)
9:39 to 10:35pm AEST (UT+10)
11:39:00 UTC to 12:35:00 UTC
Meridian Flip
60 secs Frames (x50)
10:39 to 11:54 AEST (UT+10)
12:39:00 UTC to 13:54:00 UTC
Latitude: 27° 31’ 28” = 27.5243
Longitude: 153° 03’ 40” = 153.0611
Elevation: 30m
Cheers
Dennis
(2021-10-07, 03:29 PM)theskyhound Wrote: I'd like to remind any casual readers of this thread that the position of a minor planet as calculated by SkyTools depends on the orbital elements used to plot the position, and any errors are not due to a fault in SkyTools itself, but to poorly determined, and often changing orbital elements as the asteroid passes close to the earth.
Thanks for expanding on this issue Greg, I have found SkyTools to be very reliable and accurate, although I am oblivious to what magic goes on under the hood.
Cheers
Dennis
(2021-10-07, 03:42 PM)PMSchu Wrote: Hi Dennis,
Spectacular image! Nice catch. Here's what my ST4v shows for the old iTelescope observing site at Bathhurst:
Bathhurst is 33° 24'S 149° 30'E, so near Sydney.
The time is 2354 on 2021 Oct 5. My elements for Christophe are for epoch 2021 Jul 5. ST4v estimates Christophe's motion at 25.4"/hr.
Phil S.
Wow - thanks Phil, so many Minor Planets - I'll have to go back and look at my image and try and match the field and identify them.
Cheers
Dennis