Re: [guide-user] Re: Where is C/2012 S1 (ISON) ?

Denis Dec 14, 2012

The new trial update is at:
http://www.projectpluto.com/new.htm

It will update comets (link)
Download mpc and add file using link to add mpc asteroid/comet.

Denis

Denis

On 14/12/2012 4:26 PM, P. Clay Sherrod wrote:
> Bill....not sure I understand exactly what you are talking about on the NEW
> version update....is there an automatic link that connects with the proper MPC
> site for comets?
> I would not want an automatic update on asteroids (I will not get into the
> fundamentals), so is this comets exclusively?
>
> Also, you seem to imply that there will not be a hot button for MPC data loading
> like there is now.
>
> Please elaborate......thanks!
>
> Clay
> _____
> Dr. P. Clay Sherrod
> Arkansas Sky Observatories
> MPC H45 - Petit Jean Mountain South
> MPC H41 - Petit Jean Mountain
> MPC H43 - Conway West
> http://www.arksky.org/
>
> ----- Original Message -----
> From: "Bill J. Gray" <pluto@...>
> To: <guide-user@yahoogroups.com>
> Cc: "barringtonri" <pecorp@...>
> Sent: Friday, December 14, 2012 11:05 AM
> Subject: Re: [guide-user] Re: Where is C/2012 S1 (ISON) ?
>
>
>> Hi Pete,
>>
>> As I write this, I see that Clay has directed you to the file
>> on the MPC site. Be advised: this will work if you aren't using the
>> updated Guide that I posted yesterday. That update will simply
>> download and use the required files when you use Extras...
>> Asteroid/Comet Options... Add MPC Comets/Asteroids... Click to
>> download updated comet data and add it to Guide.
>>
>> I'd recommend just going with the revised Guide.
>>
>>> I am usually very confused with MPC's website and had been accessing their
>>> http://www.minorplanetcenter.net/iau/MPCORB/CometEls.txt data from the comet
>>> link on their http://www.minorplanetcenter.net/iau/MPCORB.html page.
>>> Why would they have two different datasets?
>>
>> For various historical reasons (I think), MPC has a whole slew of
>> different orbital element formats. There's an MPCORB.DAT format, which
>> works only for heliocentric elliptical orbits (i.e., no comets, and a
>> serious loss of precision for near-parabolic objects). There's an
>> eight-line format that is more human-readable and which can store
>> parabolic, hyperbolic, and non-heliocentric orbits. And an 80-column
>> orbit used on Daily Orbit Update MPECs. And there's the format used
>> in CometEls.txt... that's the one that isn't readable by Guide.
>>
>> MPC has also kindly provided elements in the format used by Guide
>> and other desktop planetarium programs. At the time, I very much
>> appreciated their efforts in this area. Now, though, I wish I'd
>> suggested a single format that would cover all reasonable cases, to
>> avoid the current situation of bazillions of orbital element formats.
>> Though quite likely, a new format would have led to this situation:
>>
>> https://xkcd.com/927/
>>
>> -- Bill
>>
>>
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