GREGOR: Optics redesign and updates from 2018–2020
The GREGOR telescope was inaugurated in 2012. In 2018, we began a complete upgrade, involving optics, alignment, instrumentation, mechanical upgrades for vibration reduction, updated control systems, and building enhancements, and in addition, adapted management and policies. This paper describes all major updates performed during this time. Since 2012, all powered mirrors except for M1 were exchanged. Since March 2020, GREGOR observes with diffraction-limited performance and a new optics and instrument layout.
Queen Sofia Of Spain Attends The International Beach Cleanup Day (photo)12210:55
Supreme Court Justice Ruth Bader Ginsburg dies at 87561Yesterday, 12:20
Putin-critic Alexei Navalny says he was poisoned by a bottle of water in his hotel room and NOT a cup of tea at the airport (video)58217.09.2020, 15:00
Israel signs accords with United Arab Emirates and Bahrain at White House ceremony131515.09.2020, 22:20
World's Quietest Room Will Drive You Crazy in 30 Mins (video)96215.09.2020, 00:15
Mother, 25, facing DUI charges posted an Instagram video showing off her sports car just moments before she killed herself and a passenger in a high-speed crash (photo, video)143314.09.2020, 23:30