P. Clay Sherrod Mar 31, 2010
----- Original Message -----
From: "Stefano TREVISAN" <trvsfn@...>
To: <guide-user@yahoogroups.com>
Sent: Wednesday, March 31, 2010 1:08 AM
Subject: [guide-user] Re: NEAs or NEAs today?
> OK experiment, try this:
> 1) download the two files, NEA and NEAm00 from MPC and rename them both mpcorb.dat, (of
> course keep them separeted in two different directories)
> 2) put one of them in Guide,
> 3) choose one asteroid, let us say 2010 FL48, but enyone else is fine, if it is fast is
> better,
> 4) show the asteroid on Guide,
> 5) keep note of the time and AR and Dec,
> 6) substitute the first mpcorb.dat file with the second,
> 7) set the same time as recorded at point 5 and check the coordinates for the same
> asteroid you choosen at point 3,
> 8) compare the two mesures as point 5 and point 7 of AR and Dec, are they the same?
> Best regards, Stefano
>
> --- In guide-user@yahoogroups.com, "P. Clay Sherrod" <drclay@...> wrote:
>>
>> I use the database every night and other than small residuals which should be expected,
>> the targets are very much where they "should be". I am not sure why you would be
>> seeing
>> any offset unless the TIME on your computer or telescope is set incorrectly....I have
>> noted that Guide is once again "losing an hour" compared to true GMT because of the DST
>> time change. I had to change one observatory computer TIMEOFFSET = 1 and then reboot
>> to
>> have the correct GMT...that very likely could be the source of the offset.
>>
>> Dr. Clay
>> _____
>> 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: "Stefano TREVISAN" <trvsfn@...>
>> To: <guide-user@yahoogroups.com>
>> Sent: Tuesday, March 30, 2010 11:44 AM
>> Subject: [guide-user] Re: NEAs or NEAs today?
>>
>>
>> > OK, sorry, please read NEAm00 instaed of NEAtod in all my previous messages, I keep
>> > using the old name but I mean NEAm00.
>> >
>> > Stefano
>> >
>> > --- In guide-user@yahoogroups.com, "P. Clay Sherrod" <drclay@> wrote:
>> >>
>> >> Where are you getting NEAtod datasets? MPC is no longer putting out that file. It
>> >> is
>> >> now
>> >> only NEAm00. If you are picking up NEAtod.dat files from a mirror site, that is
>> >> very
>> >> likely outdated. (probably from Feb. 12 when MPC computers were hacked).
>> >>
>> >> Dr. Clay
>> >> _____
>> >> 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: "Stefano TREVISAN" <trvsfn@>
>> >> To: <guide-user@yahoogroups.com>
>> >> Sent: Tuesday, March 30, 2010 7:02 AM
>> >> Subject: [guide-user] Re: NEAs or NEAs today?
>> >>
>> >>
>> >> > Hi Dr. Clay,
>> >> > that is what I knew and what I do.
>> >> > Nevertheless I still don't fully understand why I get different results using the
>> >> > NEA
>> >> > and the NEAtod datasets.
>> >> > Many thanks for your replay.
>> >> > Stefano
>> >> >
>> >> > --- In guide-user@yahoogroups.com, "P. Clay Sherrod" <drclay@> wrote:
>> >> >>
>> >> >> Hello Stefano....
>> >> >> You will want to load "NEA Today" (NEAm00):
>> >> >> http://www.minorplanetcenter.org/iau/MPCORB/NEAm00.txt
>> >> >> and then change the file name AND extension (.dat) to the
>> >> >> mpcorb.dat and neatod.dat names.
>> >> >>
>> >> >> Having both datasets (identical except for different names) in Guide will allow
>> >> >> the
>> >> >> same
>> >> >> dataset to match in both Guide and Charon.
>> >> >>
>> >> >> Dr. Clay
>> >> >> _____
>> >> >> 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: "Stefano TREVISAN" <trvsfn@>
>> >> >> To: <guide-user@yahoogroups.com>
>> >> >> Sent: Tuesday, March 30, 2010 5:28 AM
>> >> >> Subject: [guide-user] NEAs or NEAs today?
>> >> >>
>> >> >>
>> >> >> > Hi all,
>> >> >> > I downloaded the two files from the MPC mirror, saved both as mpcorb.dat and I
>> >> >> > used
>> >> >> > them
>> >> >> > on Guide.
>> >> >> > Same asteroid, same time, same...all but the positions shown on Guide are
>> >> >> > slightly
>> >> >> > different.
>> >> >> > I know I have to use NEAtod.dat but I do not understand the difference between
>> >> >> > the
>> >> >> > two
>> >> >> > datasets, or better, I don't understand why two different results.
>> >> >> > Probably this issue was already discussed in this forum in the past but I
>> >> >> > didn't
>> >> >> > find
>> >> >> > it, sorry.
>> >> >> > Any help is really appreciated.
>> >> >> > Best regards
>> >> >> > Stefano TREVISAN
>> >> >> > B38
>> >> >> >
>> >> >> >
>> >> >> >
>> >> >> > ------------------------------------
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>> >> >> >
>> >> >> >
>> >> >> >
>> >> >>
>> >> >
>> >> >
>> >> >
>> >> >
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