Saturday 30 June 2012

Altair.

Having repositioned the guidescope further foward to allow easier connectability for the Canon. A complete rebalance was required after realligning the scopes. Altair was bright in the east and a suitable candidate for practicing on. Guidescope in perfect sync to the canon so I ran a test of 2 each of one two five and ten minute exposures at ISO 800. The ten minute was very bright and I did think that it would be unusable but no it stacked along with the others to produce a 36 minute guided image of  α Aquilae our 12th closest star to us Altair at 16.7 light years it is one of the closest stars to be directly imaged. Altair is an A type main sequece star that's nearly double our suns size but an increase in luminosity of approx 11 times.
Altair possesses an extremely rapid rate of rotation; it has a rotational period of
approximately 9 hours. For comparison, the equator of the sun requires just over 25 days for a complete rotation. This rapid rotation forces Altair to be oblate, its equatorial
diameter is over 20 percent greater than its polar diameter. Below image

 False-color image of the rapidly rotating star Altair, made with the MIRC imager on the CHARA array on Mt. Wilson

Image from Wikipedia

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