For Raspberry OS, just edit /etc/dphys-swapfile and increase the swapfile size to e.g. CONF_SWAPSIZE=512, then reboot. For other distributions, follow e.g. 2019-10-10: Stellarium works great out of ...
Boutot said he used the Stellarium astronomy app to try to gauge ... for a 10-second exposure using a 150 mm telephoto lens in manual mode. The grainy image he captured was cleaned up and enhanced ...
The first thing to do is switch away from auto modes and put the camera into manual operation, both in terms of exposure and focus. We'd recommend using manual focusing when shooting the night sky ...