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Old 03-12-2007, 06:52 AM
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Castor and Pollux

We're getting some wonderfully crisp, clear winter nights now.
You know, its definitely worth getting up early and having a look around the night sky at present.
At 6am, (although its all visible until virtually 7am at present), Venus is still gloriously bright in the south east (along with the crescent moon at the moment), Mars is still very bright indeed, due west, slap bang next door to the star Mebsuta in the constellation Gemini (the Twins).

Move your eyes in the direction of 11 o'clock from the bright orange planet Mars, and you'll suddenly realise you are looking at the famous twins themselves, Castor and Pollux, or to give them their Greek names, Kastor ("He who excels") and Poludeukeis ("Very sweet").

The left hand star (as you look at it) is actually Pollux, which appears orange to the naked eye. Castor, to the right, appears blue, though in actual fact, through a decent telescope, Castor is revealed to be quite an incredible multiple star, comprising of six separate components.

As with virtually all these myths and legends, accounts of Castor and Pollux do vary considerably, especially between ancient Greece and Rome.
A popular version is that these twins were the brothers of Helen of Troy, members of Jason's Argonaut crew (its bound to be on tv over christmas again - great!), and of mixed parentage - both having Leda as their mother, but Castor's father was King Tyndareus of Sparta (Castor was mortal originally) whereas Pollux's father was the God of Gods, Zeus himself, (Pollux was always immortal).
Zeus seduced Leda (and Pollux was the immortal result) in the guise of a Swan, Cygnus, (another constellation in the night sky) - every night sky tells a story!

The twins are certainly a very famous ancient legend, and mentioned in both Homer's "The Iliad" (difficult to read in my opinion) and "Odyssey", (MUCH more enjoyable!)

The twins, since ancient times, have always been used as a very good measurement of angular distances, being exactly 4.5 degrees apart.
They are two of the patron saints of mariners, appearing in ships' rigging as the electrical phenomenon St. Elmo's Fire (remember the 1985 film of the same name (metaphorically related I suppose) and John Parr's number one hit? Ok. Just me then).
Don't remember (or admit to remembering!) that cheesy rock song. How about the 1997 film "Face Off", starring Nicolas Cage and Alessandro Nivola. These two actors if you remember, play brothers Castor and Pollux Troy, a pair of terrorists-for-hire who are devoted to each other.
No?
Ok. Still just me then!

Do remember the twins though, especially in December. Between the dates of the 7th and 15th December (approximately) and peaking between the 12th and the 14th, the very consistent Geminids meteor shower will be visible in the night sky, if we are lucky enough to have clear viewing conditions.

The Geminids are caused by an object named 3200 phaethon, which is thought to be an extinct comet.
The meteors in this shower appear to come from a radiant , (a point in the sky), near Castor, in Gemini, (hence the shower's name). However, they can appear almost anywhere in the night sky, and often appear yellowish in colour.
The meteors travel at medium speed in relation to other showers, at about 20 miles per second, making them a little less "blink and you'll miss 'em" than other "shooting stars"!

As I said, do have a look at Venus, Mars and Castor and Pollux in the night sky at present, and lets hope for clear skies in middle of the month...
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Old 03-12-2007, 07:01 AM
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Re: Castor and Pollux

Thanx for that interesting info. Will keep a look out for them.

Paul
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Old 03-12-2007, 11:10 AM
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Re: Castor and Pollux

Hi

At the times that most people in UK will look at the sky (7pm until about 11pm)
Castor and Pollux are positioned to the left of Mars.
Can't miss Mars - very bright, and orangey, to the east (climbing higher as the night goes on)

Also - unfortunately, you can't see all 6 elements in the Castor system.
If you look with a telescope, at high-ish magnification, you'll see that Castor appears to be a very tight double star (only 3 arcseconds separation)
Both of the elements you see are themselves VERY tight doubles - so close together that a telescope can't separate them, a sectroscope is required to detect that they are doubles.
Then, a little below Castor, is a dimmer star, at just over 1 arcminute away (70 arcsec) This is also a spectroscopic bimary, and is gravitationally bound to the other Castor stars.

note:
There's another star, 3 arcmins to the right of Castor - it is unrelated to the Castor system, and is simply coincidentally quite close to our line-of-sight.

I often advise astronomy beginners to use Castor as a test of their telescope's optics.
A very good telescope will be able to 'just' separate the two brightest elements at around 50x - whereas a poor scope will require 150x and higher - a bad scope won't be able to separate them.
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Old 03-12-2007, 01:21 PM
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Re: Castor and Pollux

Thank you that sounds wonderful - I shall be out there tomorrow weather permitting.

I've been looking at a very red "star" in the east many nights recently, about 11pm (way back from the pub) and wondering if it was Mars?

Cheers
Jo
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