Arcturus disappears when zoomed in on in the far future

[qam1]

Way, way in the future the star Arcturus disappears when zoomed in on (FOV <16). It starts happening after the year 37000 but only on somedays and then further in the future it happens all the time, One date in particular, March 24th 60011 17:38UTC when there's a Mars occultation of Arcturus (Yes Really) it is ruined because Arcturus disappears and Mars just occults a blank space. Alpha Centauri/Rigel Kent does the same thing but so far every other star I looked at seems OK.

[Paolo Cancedda (pac72)]

This was hard!
The problem is Arcturus proper motion: in the (quite far) future Arcturus exits its geodesic grid triangle (level 0, number 7) and StelGeodesicGrid, not taking this migration into account, removes Arcturus from search result when its original triangle becomes not visible. The same happens, for instance, to Barnard's star.
If nobody stops me, I'll try to target the problem making the stars with high proper motion and close enough to their triangle borders migrate in the right triangle at the right time.

[gzotti (georg-zotti)]

Excellent find, Paolo! Yes, it would be good to see the constellations evolve over tens of millennia.

Actually, I would not trust Mars occulting Arcturus in 60011, the model of planetary motion loses its high accuracy after about AD6000.

Kind regards,
Georg

[Alexander Wolf (alexwolf)]

The bug report was moved to github: https://github.com/Stellarium/stellarium/issues/348