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ScopeTech’s STL-80A Maxi, f/15 refractor - Astronomy Now
2022年7月1日 · I was pleased to see that the subtle pastel grey-blues and rusty browns of Jupiter’s belts were well shown. Of course, it must be added here that one of the advantages of a relatively long-focus refractor of 1,200mm focal length, compared to a typical apochromat of 400mm, is that the same eyepiece will supply higher power while retaining ...
Researchers home in on likely whereabouts of Planet Nine
2016年2月27日 · An artist’s impression of what ‘Planet Nine’ could look like. Image credit: Caltech/R Hurt (IPAC). Using observations from NASA’s Cassini spacecraft, a team of French astronomers from the Institut de mécanique céleste et de calcul des éphémérides (Observatoire de Paris / CNRS / UPMC / université Lille 1), and the laboratory GeoAzur (Observatoire de la …