Gemini

Tuesday 19 September 2017 - 08:48:58 Posted by  Bobby
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 Mythology of Gemini

Gemini is a constellation of the Zodiac, Gemini depicts the mythological twins Castor and Pollux, after whom its two brightest stars are named. The twins sailed with the Argonauts in search of the golden fleece, and they were later regarded by the ancient Greeks as patrons of seafarers. The two stars themselves are not related, though, lying at different distances from us. Gemini sits between Taurus and Cancer, and the Sun passes through it from June 21st to July 20th.

 The Facts

  • Depiction: The Twins
  • Pronounced: JEM-in-eye
  • Genitive: Geminorum
  • Abbreviation: Gem
  • Highest in the Sky: January to February
  • Size Ranking: 30th
  • Coverage Area: 514 Sq. Degrees
  • Right Acension: 7 hours
  • Declination: 20°
  • Visibility: 90°N to 54°S

 Notable Objects

  • M35: Open cluster
  • NGC 2158: Open cluster
  • NGC 2392: Eskimo Nebula

 Named Stars

  • Castor, Alpha Geminorum
  • Pollux, Beta Geminorum
  • Alhena, Gamma Geminorum
  • Wasat, Delta Geminorum
  • Mebsuta, Epsilon Geminorum
  • Propus, Eta Geminorum
  • Tejat, Mu Geminorum
  • Alzirr, Xi Geminorum

 Best Viewed Objects/Stars

Alpha Geminorum (Castor)

 A remarkable multiple star. To the naked eye, it appears as a single star of magnitude 1.6. A small telescope divides it into a blue-white pair of stars of magnitudes 1.9 and 2.9. These form a genuine binary with an orbital period of about 470 years. Both of these stars are spectroscopic binaries. A wider companion of 9th magnitude can also be seen with a small telescope. This is, in fact, a close pair of red dwarfs, forming an eclipsing binary. The whole six-star family is just over 50 light-years away.

Beta Geminorum (Pollux)

 The brightest star in the constellation and among the 20 brightest in the sky, at magnitude 1.2. It is an orange-colored giant, 34 light-years away. The coloration is more noticeable when the star is viewed through binoculars.

Zeta Geminorum

 A Cepheid variable star, ranging between magnitudes 3.6 and 4.2 in a cycle lasting just over 10 days. It is a yellow supergit, about 1,200 light-years away. Binoculars show a wide 8th-magnitude companion, which is unrelated.

Eta Geminorum

 A variable red giant about 350 light-years away. It pulsates in size in a cycle lasting about 8 months, varying between magnitudes 3.2 and 3.9 as it does so.

M35

 Is a rich open cluster, just visible to the naked eye and easy to see with binoculars. It appears almost as large as the full Moon. Binoculars or a small telescope resolve its individual stars of 8th magnitude and fainter. The cluster lies nearly 3,000 light-years away.

NGC 2392 (The Clown-Face Nebula, The Eskimo Nebula)

 A planetary nebula. Its bluish disk, similar in size to the globe of Saturn, is visible through a small telescope, but large apertures are needed to detect the surrounding features that lend it the appearance of a face and give rise to its popular names.

Gemini
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