Changes between Version 13 and Version 14 of Outreach/Observations

Timestamp:

04/16/09 19:13:08 (17 years ago)

Author:

neil@…

Comment:

--

Outreach/Observations

@@ -37 +37 @@
 || || ||Betelgeuse (Alpha Orionis)|| ||Red supergiant|| ||0.2-1.5|| || || ||naked eye|| ||600 ly distant. Radius is 100 times that of Sun, and luminosity is 100,000 times that of the Sun. One of the largest stars known, and one of the first stars to be resolved by optical interferometers. Observations have revealed starspots and variable size. A core collapse supernova is imminent.|| ||[http://en.wikipedia.org/wiki/Betelgeuse 1] [http://www.astro.uiuc.edu/~kaler/sow/betelgeuse.html 2]||
 ||'''March'''|| || || || || || || || || || || || || || ||
-||'''April'''|| || || || || || || || || || || || || || ||
+||'''April'''|| ||M 81 + M 82|| ||interacting galaxy pair|| ||7.9, 9.3|| ||37' separation|| ||>= 10"|| ||M 81 appears as a fuzzy white spot; M 82 is fainter and noticeably elongated. Quoth the APOD: "The gravity from each galaxy dramatically affects the other during each hundred million-year pass. Last go-round, M82's gravity likely raised density waves rippling around M81, resulting in the richness of M81's spiral arms. But M81 left M82 with violent star forming regions and colliding gas clouds so energetic the galaxy glows in X-rays. In a few billion years only one galaxy will remain."|| || ||[http://apod.nasa.gov/apod/ap080325.html 1] [http://www.seds.org/messier/m/m081.html 2] [http://www.seds.org/messier/m/m082.html 3] [http://en.wikipedia.org/wiki/Messier_81 4] [http://en.wikipedia.org/wiki/Messier_82 5]||
+|| || ||Beehive Cluster (M44)|| ||open star cluster|| ||3.7|| ||95'|| ||>= binoculars|| ||~100 stars fully resolved in a small telescope. 600 lyr away, 700 Myr old|| ||[http://www.seds.org/messier/m/m044.html 1]||
+|| || ||Mizar & Alcor|| ||Binary Star|| ||2.2 mag|| ||11.8' apart|| ||>=Binoculars|| ||Bright double star, easy to find in big dipper.||
+|| || || M 37 || || open cluster || || 6.2 || || 24' || || || || || ||[http://www.seds.org/messier/m/m037.html 1]||
+|| || || M 35 || || open cluster || || 5.3 || || 28' || || || || || ||[http://www.seds.org/messier/m/m035.html 1]||
 ||'''May'''|| || || || || || || || || || || || || || ||
 ||'''June'''|| || || || || || || || || || || || || || ||