I’ve been getting back into spectroscopy in the last couple of weeks. I tried to get a few spectra of stars tonight but it was very much a case of dodging clouds and taking limited windows of opportunity!
Just before packing up it occurred to me that the planet Uranus was very high. Despite imaging through high cloud I managed to get a half decent spectrum:
The spectrum is dominated by various dark bands created by methane absorption in the Uranian atmosphere. The methane mostly absorbs reddish light; this is what gives Uranus the overall blue colour in photographs.
My dispersion for this setup was 7.7 angstroms/pixel. I hope to improve on this soon.