Changes between Version 8 and Version 9 of Outreach/Observations


Ignore:
Timestamp:
01/16/09 10:57:24 (18 years ago)
Author:
jps@…
Comment:

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  • Outreach/Observations

    v8 v9  
    5757|| || ||Owl Cluster (NGC 457)|| ||Open Cluster|| ||6 mag|| ||13'|| ||>=10"|| ||Star cluster shaped like a bird with outstretched wings, with two bright stars for eyes. Nice with 12" dob.|| ||[http://seds.org/~spider/ngc/ngc.cgi?457 1] [http://en.wikipedia.org/wiki/Owl_Cluster 2]||
    5858|| || ||Andromeda Galaxy (M31)|| ||Spiral galaxy (Sb)|| ||3.4 mag|| ||178'x63'|| ||>= 8"|| ||Can only see core in telescope, appears as faint, white cloud.|| ||[http://www.seds.org/Messier/m/m031.html 1] [http://en.wikipedia.org/wiki/Messier_31 2]||
     59|| || ||Rigel (Beta Orionis)|| ||Blue supergiant and double star || ||0.1 and 6.7 mag|| ||9.4" apart || ||>=6"|| ||Rigel is one of the brightest stars in the sky and most luminous stars in the galaxy at an impressive zero magnitude with a distance of somewhere between 700 and 900 light years means it has a luminosity in excess of 40000 times that of the Sun. Its visual binary companion is much fainter and difficult to see due to the primary's brightness. With a physical separation of roughly 2000 AU, no orbital motion has been detected, but they both exhibit similar proper motions trajectories.||||[http://en.wikipedia.org/wiki/Rigel 1] [http://www.astro.uiuc.edu/~kaler/sow/rigel.html 2]||