The first spectrum, of the star Eta Ursae Majoris, was taken for calibration purposes three days after launch.
ETA | ETA SA | Eta Kappa Nu | Eta Ursae Majoris | Pi1 Ursae Majoris | Non ho l'età | Eta Sigma Phi | Eta Draconis |
The Ursa Major Moving Group was discovered in 1869 by Richard A. Proctor, who noticed that, except for Dubhe and Alkaid (Eta Ursae Majoris), the stars of the Big Dipper asterism all have proper motions heading towards a common point in Sagittarius.