Re: [guide-user] Quick Info - Asteroid opposition date

alfredo caronia Aug 31, 2012

Good morning Mr Bill Gray!
As user of Guide 8 , i will know how it is possible to calculate date of
opposition for any asteroid for any year!


Alfredo Caronia
Il giorno 29/ago/2012 22:05, "alfredo caronia" <alfredoc49@...> ha

> Excuse me! A question:
> " This file is ok also for users of Guide 8? "
> Thanks for your help!
> Alfredo Caronia
> Il giorno 29/ago/2012 21:44, "Bill J Gray" <pluto@...> ha
> scritto:
>> **
>> Hi James,
>> Quick fix first: download this file to your Guide folder
>> (about 160 KBytes), overwriting the copy currently there.
>> This will simultaneously give you up-to-date comet information,
>> including some not available through MPC; _and_ it will clean
>> out any NEOs or critical-list objects or other asteroids that
>> are lurking in your current 'comets.dat', masquerading as comets.
>> That's the fix. Now to describe why this bug is happening :
>> This is an issue that has arisen because the MPC's list of
>> NEOs and critical list objects have grown a _lot_. In the past,
>> Guide did a passable job of downloading NEOs and critical-list
>> objects, then merging them with the general asteroid data. I've
>> modified the "add MPC comet/asteroid" dialog to include a disclaimer
>> that you almost certainly _should not_ download NEOs and critical
>> list objects. (The better solution is to use MPCORB.DAT; this
>> replaces _all_ asteroids at once, so you don't get the weirdness
>> that inevitably comes of trying to mix heterogeneous datasets.)
>> The fix I hope to offer shortly is to skip merging entirely.
>> Guide will instead have options to download NEOs and critical-list
>> and distant objects, and then display asteroids using those lists...
>> _and not showing the remaining asteroids_. That is, if you tell
>> Guide to show the current MPC's list of NEOs, you'll get NEOs,
>> not NEOs plus everything else.
>> I really should have done this from the beginning. Among other
>> benefits (such as working properly and not leading to bugs such as
>> the one you ran into), it will cause Guide to run faster. There
>> are far fewer NEOs than there are asteroids in general; if Guide
>> is just showing NEOs (or critical-list or distant objects), the
>> display time will improve by a lot.
>> -- Bill

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