Bill,
Would it be possible to have an option that has all perturbers (including asteroids)
turned on at startup? When dealing with multi-opp MPs, the auto solution always toggles
off many observations. I have to toggle them on, turn on the perturbers, and start solving
again. It would be better for me if it starts up with the perturbers on.

Thanks! This is a very useful program and I appreciate your sharing it with us.

Clear and dark skies!

- Bert

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Bert Stevens
Co-Director
Desert Moon Observatory, MPC #448
Come visit us on the web http://www.morning-twilight.com/dm448
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-----Original Message-----
From: find_orb@yahoogroups.com [mailto:find_orb@yahoogroups.com] On Behalf Of Bill Gray
Sent: Wednesday, February 13, 2013 5:21 PM
To: find_orb@yahoogroups.com
Cc: Alessandro
Subject: Re: [find_orb] Re: (6995) Minoyama/asteroid perturbers

Hi Alessandro,

I'm finding (after rejecting a few outliers) that with asteroids plus all planets, I
get a root-mean-square residual of 0.557". Shut off Venus and try again, and it climbs
to 0.568".

In running this sort of comparison, it's important to make sure that the same
observations are included/excluded with both runs. Otherwise, you can get situations
where the "wrong" setup (with, say, the effects of Venus not included) seems to show
lower residuals, but only because a few observations got so bad that they were thrown
out.

I _have_ seen situations where the residuals are smaller with one or more perturber
omitted, even though the observations used are the same. It's not a common situation,
but it does happen. But this doesn't mean one should exclude perturbers. As I mentioned
in a previous e-mail, you can be certain that the actual universe leaves all perturbers
on, all the time. The only reason to leave perturbers off is for better speed. (And
even that reason is becoming less significant, with faster
computers.)

-- Bill


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