By Dave Fuller on 12/29/2013 4:06 PM
Castor double star split graphicI'm a bit partial to Gemini. I don't believe in astrology at all, but my "sign" is Gemini, so I've known about the twins for a very long time, though less-so about the stars and astronomy of this region until much more recently in life. What fascinates me is how un-twin-like these two stars are: Pollux is this orange-looking, K-class star in the later phases of of it's life, orbited by a planet some 2.3 times the size of Jupiter. Castor, by contrast, is a six-star system composed of four A-class stars. The ones we see visually naked-eye on the sky is really 2 pairs of 2 spectroscopic binaries. We can split the "A" and "B" pairs with sufficient magnification, but not all four stars because Aa and Ab are too close together, as are Ba and Bb.

So how to observe these? Well, I like to start...

The Nightlight

This blog includes what to see in the night and daytime skies, thoughts on telescopes, binoculars, and other astronomy observing accessories and equipment, plus my own occasional notes on objects I've seen and observed. Oh, and the random theater or other "my take on life" post. In other words, there is always something interesting. Check it out.