October, 2009

Part of the Patrick Moore's Practical Astronomy Series book series (PATRICKMOORE)

Thursday, October 1

Tonight Venus and Uranus will be 2 degrees apart and near the Moon’s south limb. Would you like to have some fun tonight? Invite someone along, and let’s look at how differently people perceive stellar color!

First, Alpha Canes Venaticorum (RA 12 56 01 Dec +38 19 06), better known as Cor Caroli. The “Heart of Charles” is an easy binary located 130 light-years away. Many noteworthy observers fail to see color in this pair, but many others can! Do you think the primary star is tinged orange and the secondary is faintly blue? Now, Beta Cygni (RA 19 30 43 Dec +27 57 34)—Albireo—is also an easy, colorful binary. Or is it? Well noted for its yellow/blue color contrast, many people see it differently. They may perceive them as orange and almost purple or radically different colors—or no color at all!. Alpha Herculis (RA 17 14 38 Dec +14 23 25)—Ras Algethi—is a more difficult binary. Suggesting that the M-type primary should be red and the companion green (a color sensed...


Solar System Open Cluster Spiral Galaxy Dust Cloud Central Star 
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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.Warren Rupp ObservatoryMartelUSA

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