Larry Sep 18, 2018
On 2018-09-18 1:30 AM, 'Rolf Stadelmaier' rostm@... [guide-user] wrote:
> Hello Bill,
>
> with comet 21P I experienced another somewhat odd effect:
> When 21P is visible in Guide and when zooming in it may happen that the comet disappears at the lower screen border. Then 21P appears at a different position with an offset like the one I described in my earlier post. I found a solution to put this to an end by setting the first line in the file _Guide/asteroid/cometg.dat_ to zero. This because when I delete this file Guide claims: GUIDE needs the GUIDE CD-Rom to run.
> No problem so far. I only thaught to let you know.
>
> Kind regards,
> Rolf Stadelmaier
>
> From: mailto:guide-user@yahoogroups.com
> Sent: Saturday, September 08, 2018 9:22 PM
> To: guide-user@yahoogroups.com
> Subject: Re: [guide-user] confusing actual comet data of 21P
>
>
> Hi Rolf,
>
> I think I've got this figured out. Tom's comment about the file
> being full of HTML code was the key.
>
> A few years ago, MPC switched from plain old unencrypted HTTP traffic
> to "secure" (or at least much more secure) HTTPS traffic. Since then,
> if you asked for an unencrypted page, it would silently switch you over
> to the secure version. Now, it doesn't do that; it'll give you their
> main page instead. Which doesn't have any comet elements in it.
>
> To fix this, download
>
> https://www.projectpluto.com/add_mpc.hee
>
> It should replace an existing file in your Guide folder. _If you don't
> get a warning about replacing a file, you aren't putting it in the
> correct place_.
>
> I think what happened was that when the "correct" file was clobbered
> with meaningless HTML (rather than being updated), Guide fell back on
> the IMCCE data. That data is still useful for older comets, but hasn't
> been updated for a while now; Guide is quite reliant now on the MPC
> file for currently-visible comets.
>
> -- Bill
>
> On 2018-09-06 12:12, 'Rolf Stadelmaier' rostm@... [guide-user] wrote:
>> Hello all,
>>
>> in preparation for observing the comet 21P/Giacobini-Zinner the last night I
>> downloaded the actual MPC comet data in Guide9. When I slewed my telescope
>> to the apropriate coordinates I saw (my camera saw) no comet is present.
>> Further on in a 2-degree neighborhood I found no comet.
>> Later on when I compared backuped comet data from around mid august with
>> these actual data I found that the older trajactory and newer one are
>> parallel postponed to another by -0.54 h in RA and +6.33 ° in Dec - that's a
>> lot.
>> Has anyone else experienced this issue and/or knows what is going on?
>>
>> Best regards from a confused/frustrated observer,
>> Rolf Stadelmaier
>>
>>
>>
>>
>> ------------------------------------
>> Posted by: "Rolf Stadelmaier" <rostm@...>
>> ------------------------------------
>>
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