Hello all, Paulo Holvorcem recently mentioned on this list that he'd had a problem with a bad orbit solution from Find_Orb. That problem turns out to be a...
41
Diego R
incorregible_98
May 18, 2010 2:50 am
Okay, so, while any sort of auto RMS minimizator algorithm is not implemented, one can still look for the smallest value manually after a few clicks, right?...
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Diego R
incorregible_98
Jun 9, 2010 2:19 pm
One of the nice features of Find_Orb is its ability to self impose contrains in one or more of the six orbital parameters. But sometimes, what you got to offer...
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Diego R
incorregible_98
Jul 20, 2010 12:56 pm
This group seems to be on holidays! Well, thanks to it, I could see my question was already answered at...
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Bill J Gray
pluto@...
Jul 20, 2010 10:04 pm
Hi Diego, My apologies; that message slipped by me! As you mention, getting positions from two or more observers widely separated will help to refine the...
45
Diego R
incorregible_98
Jul 23, 2010 12:03 pm
Many thanks for the explanation, Bill. And wonderful news about the upcoming Find_Orb. I hope we can soon enjoy its new features, specially for the people that...
46
Bill J Gray
pluto@...
Jul 23, 2010 12:52 pm
Hi Diego, ... Yes. Parts of it will resemble the existing Monte Carlo code, including the idea of adding noise to the observations. Ignoring that noise could...
47
Bill J Gray
pluto@...
Oct 11, 2010 5:57 pm
Hello all, I've made a few more fixes/improvements to Find_Orb, and the result is posted at http://www.projectpluto.com/find_orb.htm ...which is the 'release'...
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Bill J Gray
pluto@...
Dec 28, 2010 9:31 pm
Hello all, The "in development" version of Find_Orb at http://home.gwi.net/~pluto/devel/find_orb.htm has some new features for ephemeris output. It'll still...
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andrew_j_walker
Jan 16, 2011 5:53 am
Hi Bill, thanks for the update! I've just tried to load the rwo file for asteroid 90482 into the latest devel version and I get the error "No observations...
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Bill J Gray
pluto@...
Jan 19, 2011 2:25 am
Hi Andrew, ... Hmmm... I've downloaded '90482.rwo', and run it through without trouble. A couple of things to try: When you click on About, the version date...
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andrew_j_walker
Jan 19, 2011 6:32 am
... For anyone interested I have just emailed Bill, the copy of the rwo file I downloaded a few days back was slightly bigger, it had at least one extra column...
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Bill J Gray
pluto@...
Jan 22, 2011 9:23 pm
Hi Andrew, ... Yup, that's the culprit. The "new" format is marked as version 2 in the header (used to be always version 1) and the "errmod" is marked as...
53
Jim Baer
jimbaer
Jan 23, 2011 1:14 am
Bill, "Apparently, the new .rwo files incorporate the de-biasing strategy described in Icarus 210 (2010) 158-181, "Treatment of star catalog biases in asteroid...
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Alessandro
alessandro_o...
Jan 29, 2011 12:33 pm
Here is a newby question for people who are interested in orbit determination. Let's imagine that an object MYOBJ has been measured only three times, according...
55
wlodarczyk_i
Jan 29, 2011 2:17 pm
Similar possible solution for nominal orbit with the use of the OrbFit software and Gauss/Vaisala orbit: epoch: JD2455600.5 TT=2011 Feb. 08 a=0.819522 AU ...
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Andy Puckett
puck2017
Jan 29, 2011 5:54 pm
I believe that 3 points is the minimum to determine an orbit. (3 observations * 2 coordinates each = 6 = number of orbital parameters.). So Find_Orb plots an...
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Dave Herald
dave_herald
Jan 29, 2011 6:41 pm
I fully agree with Andy re the zero residuals. An upsides of the ready availability of software to do complex tasks such as orbit determination is that it...
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Bill J Gray
pluto@...
Jan 29, 2011 7:05 pm
Hi Alessandro, (Side note: this discussion appears to be continuing on both the Find_Orb and MPML lists. Fortunately, both are open to viewing by ...
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Alessandro
alessandro_o...
Jan 30, 2011 2:23 am
Thanks Bill and thanks to the many people who have answered my question. I understand that having only 3 observations there are many orbits which are equally...
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Bill J Gray
pluto@...
Jan 31, 2011 3:10 am
Hi Alessandro, ... Both this orbit, and the previous ones, definitely fit into the "zebras" category; i.e., they would be very unusual objects if real. ......
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Aboulfazl Momenabadi
momenabadi_a...
Feb 14, 2011 5:49 pm
Dear sir I want to access the full information of all known celestial bodies in the skies, like as stars, planets, nebulas,... . and i know that there are...
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Bill J Gray
pluto@...
Feb 16, 2011 3:06 am
... Hmmm... much depends on what you want to do. (This is a bit off-topic for this list, by the way; we discuss orbit determination, usually in connection...
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Bill J Gray
pluto@...
Mar 2, 2011 6:52 pm
Hi Jan, For some reason, your message didn't make it onto the list. I only got it because it was cc'd to me... I'm posting it on-list in hopes that somebody...
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Roger W. Sinnott
rwsinnott
Mar 2, 2011 7:14 pm
Jan (and Bill), There is a good explanation in A. D. Dubyago, THE DETERMINATION OF ORBITS (Macmillan, 1961): Chapter 7, "Determination of an Orbit by Two ...
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fdmazzone
Mar 5, 2011 12:24 am
Hello All! I apologize by my very very limited english. I download recently the last version of find_orb (2010-10-11). I had problems with Monte Carlo. When I...
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Andrew Lowe
lowe4091
Apr 15, 2011 7:44 pm
Hi Bill, Is there some way to force a standard epoch for perturbed orbit solutions? When I compute orbits for the MPC, I need to use the current default date....
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Bill J Gray
pluto@...
Apr 16, 2011 3:00 am
Hi Andrew, ... Seems like a good idea. I've added it. Go to http://home.gwi.net/~pluto/devel/find_orb.htm It's not listed on the Web page yet, but if you...
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Andrew Lowe
lowe4091
Apr 16, 2011 5:09 am
Thanks Bill, it works perfectly. Andrew...
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Andrew Lowe
lowe4091
Apr 25, 2011 4:53 pm
Hi Bill, 1. Any chance that you could add the "uncertainty parameter" as defined by the MPC to the orbital solution? I have been using Find_Orb to link...
