Phobos 3D model rotation is offset by 180°

When comparing images from the Perseverance rover with a matching Stellarium simulation, the rotation of Phobos is offset by 180°, so the side that should be pointing away from Mars is pointing inwards.

Expected Behaviour

Phobos should look like this:

https://flic.kr/p/2sAEB4a

Raw image: https://mars.nasa.gov/mars2020/multimedia/raw-images/ZR0_1978_0842496245_410ECM_N0910806ZCAM01577_1100LMJ

Excerpt from the image metadata:

"date_taken_mars": "Sol-01978M01:37:59.697",
"credit": "NASA/JPL-Caltech/ASU",
"date_taken_utc": "2026-09-12T15:08:50.767",

Simulation without 3D planets enabled, the large crater Stickney is roughly in the right position:

Actual Behaviour

Phobos is showing it's backside to Mars:

Propsed fix

I managed to fix the simulation by rotating the file models/m2deimos.obj.gz 180° around the spin axis.

Now it looks correct:

Fixed 3D Model: m1phobos.obj.gz

Steps to reproduce

• Enable 3D Planets
• Set location to Perseverance (Mars, N 18° 26' 47.76", E 77° 15' 52.57", -2000m)
• Set time to 2026-09-12T15:08:50Z
• Compare Phobos simulation with Rover image

System

• Stellarium version: stellarium-26.2-qt6-win64.exe
• Operating system: Win 10
• Graphics Card: AMD Radeon