Oktant (Sternbild)
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Home > Art, Film & Photography > Oktant (Sternbild): Oktant, HD 212301, Polaris Australis, HD 142022, HD 142022 AB, HD 212301 B
Oktant (Sternbild): Oktant, HD 212301, Polaris Australis, HD 142022, HD 142022 AB, HD 212301 B

Oktant (Sternbild): Oktant, HD 212301, Polaris Australis, HD 142022, HD 142022 AB, HD 212301 B


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About the Book

Aus Wikipedia. Nicht dargestellt. Auszug: Sigma Octantis (? Oct / ? Octantis) is a magnitude 5.6 star in the constellation Octans most notable for being the current South Star. Sigma Octantis is approximately 270 light years from Earth, and is classified as a Giant, with a spectral type of F0 III. It is a Delta Scuti variable, with magnitude varying by about 0.03 magnitudes over 2.3 hours. Sigma Octantis is the dimmest star to be represented on a national flag. It appears on the flag of Brazil, symbolising the capital city Brasilia. Its position near the southern celestial pole makes it the southern hemisphere's pole star, whence its occasional name, Polaris Australis. Sigma Octantis is the southern pole star, whose counterpart to Polaris, the current North Star. To an observer in the southern hemisphere, Sigma Octantis appears almost motionless and all the other stars in the Southern sky appear to rotate around it. It is part of a small "half hexagon" shape. It is over a degree away from the true south pole, and the south celestial pole is moving away from it due to precession of the equinoxes. Sigma Octantis is sometimes called Polaris Australis, or South Star, though it has never been officially recognised as such and this name is certainly a modern invention. Map of the trapezoidal asterism including Sigma OctantisAt magnitude 5.5, Sigma Octantis is barely visible to the naked eye, making it a rather poor pole star, especially by comparison with the much brighter and more easily visible Polaris. Because of this, the Crux constellation is often preferred for determining the position of the South Celestial Pole. Once Sigma Octantis' approximate position has been determined, either by the major stars in Octans or using the Southern Cross method, it can be positively verified using an asterism. Sigma Octantis, Kappa Octantis, Tau Octantis and Upsilon Octantis are all stars of around magnitude 5.5, and form the distinctive sha...http: //booksllc.net/?l=d


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Product Details
  • ISBN-13: 9781159211547
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • No of Pages: 24
  • Spine Width: 2 mm
  • Weight: 50 gr
  • ISBN-10: 115921154X
  • Publisher Date: 22 Jul 2010
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Sub Title: Oktant, HD 212301, Polaris Australis, HD 142022, HD 142022 AB, HD 212301 B
  • Width: 229 mm


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