Home » News & Blogs » My Favorite Double Star
Bookmark and Share
Simostronomy

My Favorite Double Star

23 Apr 2012, 15:34 UTC
My Favorite Double Star
(200 words excerpt, click title or image to see full post)

Epsilon Lyrae, the Double DoubleIf you have spent any time looking through binoculars or telescopes you have undoubtedly come across a double star or two. Someone probably showed you Alberio (beta Cygni) at a star party or tried to impress you with a view of epsilon Lyrae, the famous Double Double in Lyra. One of my favorites is Rigel, the lower foot of Orion. Not many observers know Rigel is actually a double star. It has a 6.8 magnitude companion, Rigel B, 9 arc seconds away. This would be an easy double to separate in most small telescopes, but Rigel is the seventh brightest star in the sky. As such, it is some 400 times brighter than its companion, so Rigel B gets lost in the glare of its primary. Once you know where to look it's easy to find.Double stars are interesting to people for a number of reasons. Some like the challenge of splitting close pairs with the smallest instrument possible. Others like to measure the characteristics, such as separation, position angle and magnitudes. But what really delights most people is a pair that exhibits a striking color combination. Some of the more popular pairs include Alberio (gold/sapphire), ...

Note: All formatting and links have been removed - click title or image to see full article.

Comment on this Post

* :
* :
:
* :
:
* required

Latest Vodcast

Latest Podcast

Most Popular Video

Advertise PTTU

Extrasolar Planets

  • Planetary Systems: 1160
  • Multiple Planet Systems: 472
  • Planets: 1850
more

NASA Picture of the Day

Astronomy Picture of the Day

astronomy_pod