M81 is one of the classic grand design spiral arm galaxies. ... Hubble Space Telescope OBSERvations have detected Cepheid Variables in the some fields on the outskirts of M81 and thus M81 is a fundamental calibrator of the Extragalactic Distance Scale. This exposure is taken through a blue filter using re-imaging optics on a 52-inch telescope. ... The exposure time was 30 seconds. ... The Ultraviolet Image of M81 comes from the Ultraviolet Imaging Telescope which is flown on the Shuttle. ...

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... Nova M31 2008-12b , ATEL 1886 , discovered 2008/12/30.207 by Koichi Nishiyama and Fujio Kabashima ; P60-Fast Transients In Nearby Galaxies (PDF) . Found in M31 at R.A. = 00h43m05s.03, Decl. ... Mag 19.4, Type Extragalactic Nova (References: CBAT M31 page ) . Nova M31 2008-12a (= PTF09hsd) (= Nova M31 2011-10e? ) (= TCP J00452884+4154095 ) (= Nova M31 2012-10b? ), (= PNV J00452885+4154094 ), (= Nova M31 2011-10e? ) ATEL 5607 , discovered 2008/12/26.481 by Koichi Nishiyama and Fujio Kabashima . ...

Astronotes Armagh Planetarium's Stellar Blog! ... Concept Spacecraft . ... Monthly Sky Notes . ... October . ... By admin September 30, 2011 Posted in: Human Exploration . Gemini Spacecraft: The red and gold spheres in the Equipment Module are propellant tanks and the red cylinder in the nose is the parachute pack. ... Image credit: NASA) . ... Amazingly in 2011, an outfit called Space Operations Inc proposed launching updated Geminis (rebadged as Eclipse spacecraft) for commercial clients! ...

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... Archives . ... Mmm.. chi-square! The withering criticisms Hyunsook has been directing towards the faulty use of chisquare by astronomers brings to mind this classic comment by [astronomer] Jeremy Drake during the 2005 Chandra Calibration Workshop: . ... They might say ?don?t use chisq?, and all we here is ?chisq?. ... Tags: calibration uncertainty , CCW , chi-square , chisq , Jeremy Drake . ... Comment ( RSS ) | ... Not always it?s faulty. ... Chandra Blog . ... Entries (RSS) and Comments (RSS) . ...

... As the risk of offending by over-simplifying, the deconvolution algorithms presented here can be classified in the following way: . ... Also, we don't actually understand the nature of the extra information used by RL to generate a unique solution. ... Bayesian methods. ... Blind deconvolution. I think that, for me, one of the most interesting and satisfying topics at this conference was blind deconvolution: recovery of the PSF function as well as an image of the sky ( Christou, Schulz ). ...

Polar Alignment Using The Star Drift Method . Articles | ... This method with, a little practice, can give you reasonable polar alignment within one half hour. ... If the star drifts northward, your scope is west of the pole. ... Remember that as your adjustments get you closer to the pole, the star will drift slower and you must wait longer to detect a north-south drift. If the star drifts south, you are east of the pole and you must turn the mount towards the west. ... www.astronomy.net . ...