Astrometrica has been loading MPCorb OK but cannot detect comets. I noticed that it says 'error loading comet.sat in xxx'. This appears to be due to the ...
The MPC site has the file named correctly.... And the file downloads OK for me (in different software). Dave Herald Canberra, Australia ... From: Lawrence...
Hello! I wonder whether it would not be good if Astrométrica recognized in the images the stars are saturated in both individual images as when joined. Thank...
Hi All, Been using Astrometrica for years but over the last couple of days (after a pretty long break away from astrometry) the MPC has rejected my data...
My question is: what is the setting on your camera/capture software re the time stamping? Is it set to record the start, middle or end in the fits file? Dave...
Start on the capture software and start in Astrometrica (I just checked the astrometry in Canopus as well - same result). I then checked the time manually...
... Are you working at fast f-ratio, i.e. a fast prime focus system or some SC with an extreme focal reducer? What order of astrometric fit have you specified...
Hi Reiner, It only seems to affect the one target and not any others! I'm at f/4 on my f/10 14" LX200GPS. I use a Cubic fit and the matching stars seemed to...
Hmmmm... Interesting. I imaged Toro about a week ago, and MPC rejected my data as well, also because I was off by 5". Gerald...
Gerald McKeegan
geraldspace@...
Feb 19, 2008 5:40 pm
3667
Gentlemen, please post your astrometry here. It will be easy to determine if your data is suspect, or whether there is an issue with the MPC checking...
I did not image this target but in the past I was able to confirm the MPC 'residuals' with differences between my observations and 'official' MPC ephemerides....
For asteroids with elements incorporating perturbations, the standard epoch is presently 2007 Oct. 27, so it would not be unusual for these objects to have...
My image shows the position as of the MPCORB field downloaded the day the images were taken. For those that requested it, here is my astrometry including 1620 ...
... Not that I know how they do it, but you can propagate the last elements to the epoch of the observations and compare predicted with observed. Juan ... -- ...
David, I recomputed (using Find_Orb) the orbit of (1685) using the data at NeoDys, and can confirm that your data has problems. Here are the residuals for the...
Andrew, David, Ladislav, ... So what does FindOrb say re. along-track or cross-track? Please click on each observation and watch the relevant values that...
Given the references to MPCOrb in this thread in the context of O-C's, there is another issue with MPCOrb that needs to be kept in mind (which I noted in this...
Hi Andrew, I'm doing photometric runs on the targets for YORP and Shape Modelling - the astrometry was just a by product. At ~3.5"/min motion in RA the target...
Hi Reiner, NABG but oriented North/South. I am not over exposed and still within the lineararity of my CCD. Re my residuals - I always figure that my pre fit...
David, Do you have a mechanical shutter that you can hear open and close? This is the most reliable way to check the times, and personally is the only one I...
Robert McNaught
rmn@...
Feb 20, 2008 2:11 am
3680
Yep - mechanical and I have confirmed that the times recorded coincide with the shutter motion (at least within a second) My photometric work doesn't...
Reiner, after correcting the last declination by +10", all the "cross" values are less than 0.2", confirming that the error is in the timing. The magnitude of...
We've noticed a problem with trailed images in that Astrometrica seems to fit its solution to the starting end of the trail, using a reasonable aperture size...
paul weissman
paul.r.weissman@...
Feb 21, 2008 12:03 am
3684
... Indeed, even if you are doing astrometry on faint fast moving objects, tracking on the object's motion is the way to go. Trailed astrometric stars are...
Robert McNaught
rmn@...
Feb 21, 2008 1:50 am
3685
... However do not assume that ... astrometry - because ... well defined, an orbit ... (currently 1.5") - or the ... solution by 50%. A clarification about the...
... Thanks, Gareth, for pointing this out again. This ITA responsibility for the numbered objects seems to be not known to *most* people in the minor planet...
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