Sun is too dark when viewing from Haumea, Makemake or Eris

[pjw]

Sun view from Haumea should be (absolute) 4.83 mag, but when zooming in at FOV 5.0 and smaller Venus is lighter! More zooming in makes the sun even darker.
Same when viewing from Makemake or Eris.
It works fine when viewing from Pluto and the Planets, Moons and Asteroids.

Even viewing the sun from C/2014 Q2 (Lovejoy) (imported by sunsystem-editor) is fine until 27.12.2042 (distance 50.002 AE) when the sun will be (absolute) 4.83 mag. BUT one day later at 50.006 AE distance (still absolute 4.83 mag) the sun is vanished from the display at the same zoom level (FOV 0.1).

Tested with Stellarium 0.13.2 on Linux.

[pjw (pjw1965)]

Sun is always absolute 4.83 mag. My fault.

viewing from C/2014 Q2 (Lovejoy):
When the sun is at -18.25 mag there is a big jump from viewing it and vanished at -18.24 mag
The sun shrinks between 50.000 AE and 50.005 AE from 100% to 0%

Sun from Eris: -16.82 mag, 96.362 AE
Sun from Makemake: -18.15 mag, 52.393 AE
Sun from Haumea: -18.22 mag, 50.729 AE

[gzotti (georg-zotti)]

This is likely the same problem that existed with the solar system observer when it was configured too far from the sun. The 3D spheres are not drawn beyond 50 AU. A fix would be to draw yet another bright 2D halo if sun is even farther away.

[pjw (pjw1965)]

No halo nessesary, just do it like any other fixstar, if beyond 50 AU. They don't vanish when zooming in.

[pjw (pjw1965)]

Fix:

File core/StelCore.cpp: line 418, function StelCore::preDraw():
- increase currentProjectorParams.zFar from 50. to 100.

So our solar-system is expanded to 100 AU and all known objects inside work fine with the sun and with other planets too.

[Alexander Wolf (alexwolf)]

Thanks, Peter!

I'm increase your limit to 500 A.U. (for bodies from Oort cloud).

[Alexander Wolf (alexwolf)]

A fix has been committed as revision 7345 of the trunk branch of Stellarium's Bazaar repository at Launchpad: http://bazaar.launchpad.net/~stellarium/stellarium/trunk/revision/7345

[gzotti (georg-zotti)]

This reduces distance resolution! (Z buffer; I don't know exactly what consequences result, though, we usually pre-sort objects by distance...)

[Alexander Wolf (alexwolf)]

Georg, we can change zNear param also.