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·Astronomy: Solar Activity - THE SUNSPOT CYCLE
·Astronomy: Solar Activity - Sunspot-OBSERVING SUNSPOTS
·Astronomy: Solar Activity - SUNNY SIDE UP
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Astronomy & Telescope Astronomy: Double Star

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  Double Star Double Star: Astronomy: Double Star - SPLITTING STARS

SPLITTING STARS

A double's separation is the apparent distance of the companion, or secondary star, from the brighter star, the primary. Albireo (Beta Cygni), a beautiful double with colors described as gold and sapphire, has a separation of 34 arcseconds.

 
 
  Posted by astronomy on Thursday, December 02 @ 14:01:23 CST (7 reads)
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  Double Star Double Star: Astronomy: Double Star - SEEING DOUBLE

SEEING DOUBLE

You do not need a large telescope to observe double stars. A 3 inch (75 mm) refractor can produce excellent results, since its narrow field renders high-contrast, pinpoint star images. A 6 inch (150 mm) scope, though, is better for resolving close doubles.

 
 
  Posted by astronomy on Thursday, December 02 @ 14:00:37 CST (8 reads)
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  Double Star Double Star: Astronomy: Double Star - POSITION ANGLE

POSITION ANGLE

The position of the secondary star with respect to the primary is called the position angle, or PA. The primary star is designated component A, and the secondary, component B. Other components, if any, are listed as C, D, and so forth.

 
 
  Posted by astronomy on Thursday, December 02 @ 13:59:46 CST (8 reads)
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  Double Star Double Star: Astronomy: Double Star - OTHER TYPES

OTHER TYPES

Some multiple-star systems contain more than two stars. One famous example is the Trapezium, a nexus offour prominent stars at the heart of the Great Nebula in Orion.

 
 
  Posted by astronomy on Thursday, December 02 @ 13:59:03 CST (7 reads)
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  Double Star Double Star: Astronomy: Double Star - MAGNITUDE AND COLOR DIFFERENCES

MAGNITUDE AND COLOR DIFFERENCES

Double stars of different magnitudes and small separa-tions can be both a joy and a challenge to observe. Tau Eridani's 5.7 arcsecond separation would not usually be a problem for, say, a 6 inch (150 mm) telescope to split. But in this case, the primary's magnitude of 4.0 can overwhelm the magnitude 10.0 secondary, particularly in pool-seeing. Still, it is not impossible, and seeing a bright star next to a faint one with just a hairbreadth between them can be breathtaking.

 
 
  Posted by astronomy on Thursday, December 02 @ 13:58:17 CST (8 reads)
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  Double Star Double Star: Astronomy: Double Star - DOUBLE DEDICATION

DOUBLE DEDICATION

The first double star ever recorded—Mizar in the Big Dipper— was discovered accidentally in 1650 by the Italian astronomer Giovanni Battista Riccioli. Subsequent discoveries by other astronomers were also accidental. By 1779, enough observations had been compiled to inspire the indefatigable William Herschel (1738-1822) to begin a systematic search for these stellar curiosities.

 
 
  Posted by astronomy on Thursday, December 02 @ 13:57:25 CST (8 reads)
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  Double Star Double Star: Astronomy: Double Star - OBSERVING DOUBLE STARS

OBSERVING DOUBLE STARS

You can enjoy the different colors of a double, meet the challenge of splitting a close pair, or precisely measure separations.

 
 
  Posted by astronomy on Thursday, December 02 @ 13:56:38 CST (8 reads)
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