RV (Radial Velocity)

Recommended equipment : eShel, Lhires III
Time : 1 h

 Stars are moving into space and their spectra appear shifted compared to the same lines in laboratory. Exemple here is SAO104807 which is moving toward us at a speed of 100 km/Sec and SAP112958 which is moving away at the speed of 99 km/sec. With the Lhires III high resolution, you even have to correct from the Earth movement to do a proper calculation!

Shift in the spectra of those two stars taken with a Celestron 11 and a Lhires III is easily visible compared to Alair spectra. This is an easy and highly educational project !

Comparison spectra SAO104807, Altair, and SAO 112958

The same spectra in graphic form