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Ron Baalke
baalke@...
Aug 1, 2003 9:06 pm
10322
Greetings all! Forgive the somewhat off topic nature of this post but we are launching a new group called the Society for Astronomical Sciences (SAS),...
Robert Stephens
rstephens@...
Aug 1, 2003 9:55 pm
10323
Here's two astrometry reports. The first using USNO A2.0. The second using the UCAC 2.0. If the skies would only clear!!!! ...
... Andrew, I sent off some more positions of 2003 OX7 from early this morning to the MPC today, so hopefully the orbit will get updated soon, regards, Peter ...
Hello Thanks to the observations of J95 the elements changed a little but the resulting trajectory is very similar to the previous one. The encounters with ...
gallardo@...
Aug 2, 2003 7:06 pm
10326
I've just seen the new MPECs and I noticed this: 2001 HZ58 Epoch 2003 June 10.0 TT = JDT 2452800.5 MPC M 103.48707 (2000.0)...
... ******************************************************************* Alan W. Harris Senior Research Scientist Space Science Institute 4603 Orange Knoll Ave....
... The predicted magnitude in the ephemeris ( around 18) is so much brighter than the one reported in the observations listed in P04, I think an error has...
Tony Beresford
dberesford@...
Aug 3, 2003 12:12 am
10329
We are probably going to have a few clear nights in UK. I can image down to ~mag 17.5 or so with my 12" LX200 and MX916. I would like to know whether there...
I searched the MPML archive for "numerical integration" without success. I implemented the 5-th order Runge-Kutta algorithm in Dan Boulet's Methods of Orbit...
If you're interested in lightcurve work, there's the campaign for 37655 Illapa going on right now; see http://www.uai.it/sez_ast/37655/37655.htm For a more...
There has been a correction to these values, given in the following MPEC 2003-P05 It was a mistake! By Andrea ... Andrea Pelloni ARA- Associazione Romana...
Hi Glen, many years ago I tested several algorithms for thier suitability for the integration of minor planets and comets. There are many procedures and it...
Bill Gray hasnt had any IMP 8 observations since june 16. As he is the only one calculating an orbit for this nuisance could somebody make an observation in...
Tony Beresford
dberesford@...
Aug 3, 2003 1:06 pm
10335
Hi Glen, There are many variable-stepsize algorithms, like the Bulirsch-Stoer or the Everhart's RADAU, and you can find documentation on the net. I can...
Regarding Glen Deen's inquiry about algorithms for numerical integration, I recommend that he inspect Bill Gray's program Find_Orb on his website, at...
Hi Glen, A while back, I wrote a little utility to read the MPC's 'mpcorb.dat' file(s) and integrate them to any desired epoch. The source code and comments...
Tony Beresford wrote: "...Bill Gray hasnt had any IMP 8 observations since june 16. As he is the only one calculating an orbit for this nuisance could somebody...
I'm rather inexperienced in this field, but as far as I've seen Runge-Kutta integrators are not very convinient for orbital integration, even if they have...
I received my copy of UCAC2 in the mail this past week, and I too can hardly wait to start using it. It will certainly make my life a lot easier! -- Bill Owen...
Bill Owen
wmo@...
Aug 3, 2003 10:02 pm
10341
Hi Mihailo, You wrote: "... as far as I've seen Runge-Kutta integrators are not very convinient for orbital integration, even if they have adaptive step and...
Hi Bill, ... Well, RK-based methods are quite easy to program and can be made rather precise but as you go further with precision (i. e. reducing the stepsize)...
(37655) Illapa is rapidly brightening and now is the time to start making your photometric observations. The close encounter with this Potentially Hazardous ...
While browsing through some very old issues of Astronomy magazine during my recent run at RHO, I came across a letter from a Harold Schenk which asked ...
Dear all, I have observed (37655) during 3 nights and it seems the amplitude of its light changes is rather small and lightcurve shape probably complicated. ...
I've often wondered whether some of the comets spotted by SOHO aren't actually asteroids. Jim Carlson ... From: "RA Kowalski" <bitnik@...> To: "MPML"...
One should be clear about this: asteroids and comets are two different kinds of solar system objects. There is no link between them and there is consequently...
Michel Festou
festou@...
Aug 4, 2003 4:16 pm
10348
... I have to differ a bit from Michel Festou's response. While there are strong dynamical arguments to be applied, one never knows the "truth" without...
ESA Science News http://sci.esa.int 01 Aug 2003 Ulysses sees Galactic Dust on the rise Since early 1992 Ulysses has been monitoring the stream of stardust...
Ron Baalke
baalke@...
Aug 4, 2003 7:40 pm
10350
... In 1993 I got in touch with Harald Schenk in connection with his request for observations of 899 Jocaste, and on October 13, 15 and 20 I took photographic...
