I wonder why should I click several times in any given method (e.g. Full Step or even Auto) to obtain smaller RMS? Some cases, you even get oscillating values....
33
andrew_j_walker
Apr 9, 2010 6:56 pm
Hi, I've got a couple of suggestions that hopefully (!) will be trivial to implement. Firstly, elements.txt has a nice output of the most recent fit orbit ...
34
Bill J Gray
pluto@...
Apr 10, 2010 8:38 pm
Hello all, As described in my reply to Andrew, I've posted a new 'in development' version at http://www.gwi.net/~pluto/devel/find_orb.htm In addition to...
35
Bill J Gray
pluto@...
Apr 10, 2010 8:38 pm
Hi Andrew, ... That one was easy enough to do. Find_Orb will now create a file, 'state.txt', that is basically just a log of all the 'elements.txt' files...
36
andrew_j_walker
Apr 11, 2010 6:42 am
... Thanks for putting these in Bill, it's really appreciated! I'm planning to do some runs on 2001 QR322 (a Neptune Trojan) to check some of the work done in...
37
Bill J Gray
pluto@...
Apr 12, 2010 2:29 am
Hi Diego, ... True. That usually happens when the orbit is poorly defined, though sometimes in other cases. Find_Orb has a lot of code that attempts to find...
38
hristo_dpavlov
Apr 12, 2010 4:26 pm
Hello, Is there a compiled windows console version of Find_Orb that I could use and is there any documentation on how to use it? Thanks, Hristo....
39
Bill J Gray
pluto@...
Apr 12, 2010 4:55 pm
Hi Hristo, There wasn't a copy of the .exe posted, no. Some time ago, I posted the source code for the console version, along with some discussion of how to...
40
Bill J Gray
pluto@...
May 5, 2010 6:54 pm
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?...
42
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...
43
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...
44
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'...
48
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...
49
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...
50
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...
51
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...
52
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...
54
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 ...
56
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...
57
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...
58
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 ...
59
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...
60
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. ......
61
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...
