Asteroids display dependent on azimuth

Gerhard Dangl Apr 12, 2017

Hello all,

I use mpcorb.dat for asteroid display in Guide9. If I set the limit to
+17mag for example, I see a lot of asteroids as expected.

But if I use a display (Size 2) and center in the range from about 2 to
70 deg azimuth (north=0, east=90), most but not all of the asteroids are
switched off. Outside this azimuth range all asteroids up to the set mag
limit are visible. No matter if asteroid labes are set ON/or OFF.

Can anybody confirm this behaviour in Guide9? Or what could be the
reason for this?