Comment 8 for bug 1291005

may have been misunderstood, what I wanted to say therewith.
Regarding a big failure of 5 days there is a light speed error of 15
minutes
of nearly no influence to this special situation.

By the way: I got helpful answer meanwhile as orbit data for asteroids are
from year
2010 and outdated now. There seems to be no algorithm which calculates
disturbing
influences from major planets, so positions get out of place the longer
time passes.
And I agree that this really is the reason for wrong positions.

Thanks for trying to help!

best regards,

Torsten

In a message dated 12.03.2014 03:45:44 Mitteleuropäische Zeit,
<email address hidden> writes:

>Correction of light speed is only important when working with moons of
planets for example or eclipsing events with sun or moon.

What? Correction of light speed is important for ALL events in Solar
System.

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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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