APO and the Adler Planetarium Mark Hammergren APO 20th Anniversary Celebra;on May 13, 2014 1939 poster Adler Research and Outreach · Twilight observing during extended evening hours (ended mid2000s), observing classes · Two major research programs: ­ Star forma;on (led by Grace WolfChase) ­ Confirma;on of basal;c asteroids (led by Mark Hammergren) Molinari 11 NearEarth Object Followup and Characteriza;on with ARC ...

... For XMM-Newton a ToO is an astronomical event observable by its instruments, which cannot be predicted and scheduled on the time scale of one year, yet is scientifically significant to justify the interruption of the ongoing XMM-Newton programme. ... Thus, XMM-Newton provides a unique opportunity for a wide variety of sensitive X-ray observations accompanied by simultaneous optical/UV measurements. ... It takes almost 48 hours to complete one revolution around the Earth. ... Figure Captions Figure 1...