these are first spectra recorded in the night of 6. June 2015 with Alpy 600 on a Vixen VC200L 8" Cassegrain and Canon EOS 40D DSLR, astro-modified and using Astronomik L-Filter.
This is more a raw test of the Alpy 600 with self developed image processing and analysis tool set, than serious science. Spectra shown below are from an uncalibrated 30 seconds single exposure (just dark subtraction). It is fun to see the differences of line profiles across Jupiter's cloudy surface.
Images from top to bottom: (1) The slit orientation, (2) raw Jupiter spectrum averaged across the whole planetary surface along the slit length and (3) single line scans taken out if the raw spectrum. One hardly can find differences of the absorption line profiles, where the brownish cloud bands are located. The original spectrum looks slightly rotated by about 1 degree of angle.
Have fun.
Seeing was bad and telescope pointing must also be improved. It looks, like the angular momentum added by weight of the Alpy to the telescope mount needs to be balanced more carefully. Currently I'm experiencing certain difficulties to go to fainter light sources yet.
Thilo
- Jupiter-Slit.png (73.57 KiB) Viewed 1968 times
- Jupiter-spektrum.jpg (140.79 KiB) Viewed 1968 times