Hi Gerhard,

The screen shots did the trick. After setting the same lat/lon,
time, etc., I got the same behavior. If I center on the RA/dec
for the "mp_off" image, most of the minor planets are missing;
move a little, and they go back on again. That allowed me to track
down the bug. It would affect any wide fields near the ecliptic
poles.

Guide has some code that computes a rectangle, in ecliptic
coordinates, that covers the on-screen rectangle. It can then very
quickly recognize that most asteroids, at the currently-specified
time, cannot possibly be in that range of ecliptic latitude or
longitude.

The code in question makes displaying asteroids a _lot_ faster.
But for some wide fields near the ecliptic poles, it could decide
that the range in ecliptic longitude was effectively zero. That
made it run even faster (since it would mean there were almost
no asteroids to display), but it wasn't really what you would
want to have happen. Fortunately, changing one line of code
caused it to work properly.

To ge the fix, download one of the following files and unZIP
it in your Guide folder :

https://www.projectpluto.com/temp/guide9.zip
https://www.projectpluto.com/temp/guide9_8.zip

Use the first for Guide 9 or 9.1, or the second for Guide 8.0.
Things are actually a little trickier for Guide 8.0 users (though
not by a lot); they should take a look at the following :

https://www.projectpluto.com/update9.htm#guide8

Essentially, this boils down to "don't apply a Guide 9 update
unless you've applied the latest Guide 8.0 update."

-- Bill

On 2017-04-15 09:42, Gerhard Dangl gerhard@... [guide-user] wrote:
> Hello Bernd and all,
>
> I have created two Guide9 screenshots as small gif files to show the
> problem of the MP display.
>
> This first image looks normal and shows MP to the set +17.0mag limit.
> See the image center cross near Vega.
> http://www.dangl.at/temp/Guide9_mp_on.gif
>
> Now in this second image I only have set the image center with one mouse
> click a little bit to the north (see the image center cross is still
> near Vega) and now most of the MP are off. And if I go back to the
> previous center position all MP are shown again. This is the strange
> behaviour of Guide9 I can not explain at the moment.
> http://www.dangl.at/temp/Guide9_mp_off.gif
>
> Help would be appreciated.
>
> Regards
> Gerhard
> www.dangl.at
>
>
>
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