Comment 9 for bug 1291005

Thanks for revealing this problem.
Of course that seems to be the reason for wrong positions up to more
than 1 degree now after 4 years of uncorrected orbit values.

By the way: This fact sounds a bit strange to me, as Ceres, Pallas, Juno,
Vesta
are the first four "minor planets" discovered between 1801 and 1807.
They are easily observable from time to time with magnitudes up to 5.5mag.
So I would have expected that at least these four should have been included
 into the
list of perturbation calculation like major planets did for sure. Why NOT?

Thanks a lot for helping with your information!

best regards,

Torsten

In a message dated 12.03.2014 06:15:42 Mitteleuropäische Zeit,
<email address hidden> writes:

The orbit of asteroids are outdated (they're from 2010). Planetary
perturbation affects their orbits. You need to download new set of them
or edit the file ssystem.ini

see
https://bugs.launchpad.net/stellarium/+bug/1288999

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https://bugs.launchpad.net/bugs/1291005

Title:
very wrong positions of minor planets

Status in Stellarium:
New

Bug description:
I tried to observe three of the minor planets during last two weeks
(Pallas, Vesta, Ceres) and had problems to find their positions at the
night sky using Stellarium 0.12.4 version. With Pallas and Vesta I
succeeded at last, but not really satisfied when comparing real
constellation with constellation shown in Stellarium. But with Ceres I
failed completely last night. At the position where she should have to
be seen very clearly there was nothing than black space. Comparing
your calculated ephemerides with an annual guide I am using since a
couple of years with great success, I realized that Ceres was shown
at a position at least

5 DAYS TOO LATE !

Similarly did that happen to Pallas and Vesta positions, but they
differred 'only' about two days in movement (too late also), and
Pallas' orbit line is not really what you will observe in the sky, it
moves a bit more to the right (smaller values of rectascension I estimate,
maybe smaller values of declination too).

Of course this experience was some sort of frustrating for me as I trusted
in calculated positions of such well-known objects in the sky even if
Stellarium is an amateur developped program with no cost. Now I am irritated a
bit whether or
not there is to be trusted in the shown positions of other minor objects.

Maybe there is an unsufficient input of data for ephemerides of minor
planets in summary (no disturbing calculation?
wrong equinox or without adjustment to nowadays?). I only can guess, but I
dont know. It would be fine if you find
the reason for this problem and it can be solved.

Thank you for listening to my description!

Best regards,

Torsten Merkel

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