Re: [guide-user] Crashes when adding asteroids

Christian Ambros Jul 6, 2012

This is a good idea, Denis.

 
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>________________________________
> Von: Denis <boucherd@...>
>An: guide-user@yahoogroups.com
>Gesendet: 0:07 Samstag, 7.Juli 2012
>Betreff: Re: [guide-user] Crashes when adding asteroids
>
>

>Bill,
>
>Can I make a suggestion. At present, I use the alt-j to point
>MPCORB_PATH= to the file I wish to use. Why not make a selector for a
>MPC file the same way a "TLE" file is selected for display. People would
>download from the MPC site the needed files and select the one to
>display when needed. This would avoid changing the name in alt-j mode or
>renaming the file to "mpcorb.dat"
>
>Denis
>
>On 06/07/2012 11:02 AM, Bill J Gray wrote:
>> Hello all,
>>
>> OK, I've got it figured out... I should have puzzled it out right away;
>> in hindsight, the problem is quite obvious to me.
>>
>> Short version: don't use the links to download critical, unusual, or
>> distant objects. Update 'mpcorb.dat' instead. (I'll remove those three
>> links in the next update.)
>>
>> Long version follows:
>>
>> Once upon a time, all of the "add-on" element lists were small, with at
>> most a few hundred objects. But the "distant" list now contains 1717 objects;
>> the "unusuals" list contains 9701 objects; and the "critical list" contains
>> 1691 objects.
>>
>> This raises a dilemma. I _could_ just revise Guide to handle this sort
>> of thing. But it would be wrong to just bump up the limit. It puts
>> thousands of objects into the "added comets/asteroids" file; if you go
>> to Extras... Asteroid/Comet Options... Edit Comet/Asteroid Data, you
>> get an immense list of objects. And Guide's efforts to merge in these
>> MPC update files with existing asteroid data have never been completely
>> successful.
>>
>> To quote from the dialog wherein one can download asteroid data:
>>
>> "...Use of the following links [to update distant, critical-list,
>> and unusual objects] is not really recommended. The objects in question
>> already have well-determined orbits, and the latest MPC data will
>> represent only a small improvement. By far the best way to update
>> asteroids is to use MPCORB. This allows you to update Guide's asteroid
>> data completely. The only downside is that MPCORB is about 30 MBytes
>> in compressed form, a bit large for those with dial-up modems."
>>
>> That last issue is getting to be less of a problem; for most of us,
>> a 30 MByte download is peanuts. The next update will remove the ability
>> to use those three links; we'll go from "updating" asteroids to just
>> replacing the entire asteroid dataset with a new MPCORB.DAT.
>>
>> (Ideally, I'd do the same thing with comets. Sadly, there is no
>> way to get a complete comet database; MPC just supplies "currently
>> observable comets", which have to be merged with older comets in order
>> to have a complete list of comets.)
>>
>> -- Bill
>>
>>
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