... Posts tagged ?aperture photometry? ... There is a lesson that statisticians, especially of the Bayesian persuasion, have been hammering into our skulls for ages: do not subtract background. ... Such is the case with X-ray aperture photometry. ... Tags: aperture photometry , background , background marginalization , background subtraction , celldetect , Chandra , ciao , EotW , Equation , error propagation , ldetect , local detect , wavdetect , X-ray . ... vlk on [MADS] Parallel Coordinates . ...

... SEARCH ASP SITE: Match ALL words Match ANY word . ... Women in Astronomy . ... Science Fiction with Good Astronomy . ... Dramatic, complex history and future of the battle between dark matter and regular matter life-forms in the universe. ... 1996, Ace)  Complex hard-science novel by a Canadian amateur astronomer with intriguing ideas about dark matter and even dark matter life forms. back to topic list . ... The Milky Way becomes an active galaxy, but life on Earth is saved by a higher intelligence...

... The Magazine . ... Astronomy for Kids . ... Why Join? ... Brian May joins Astronomy magazineт??s Editorial Advisory Board . ... It isnт??t every day that a legend joins with Astronomy magazine, so the brand is proud to announce that astronomer, songwriter, producer, and performer Brian May has joined the magazineт??s Editorial Advisory Board. ... He joins the Astronomy magazine team on its Editorial Advisory Board. ... Only registered members of Astronomy.com are allowed to comment on this article. ...

... Bad Astronomy . ... Bitesize Astronomy . ... For example, I have recently become interested in very low mass stars; stars with less than 15% or so the mass of the Sun. ... The painting is of an extremely low mass star called Gliese 229B or Gl229B for short. Gl229B is what we call a brown dwarf; a star with such a low mass that it cannot even fuse hydrogen into helium in its core. Gl229B orbits a more massive, but still very low mass star, called (you guessed it!) ... 2008 Phil Plait. ...

... The initial descriptions of the FITS format provided a simplified method for describing the physical coordinate values of the image pixels, but deliberately did not specify any of the detailed conventions required to convey the complexities of actual image projections. ... They were CRPIX n for the reference pixel location on pixel axis n , CRVAL n for the coordinate value at that pixel, CDELT n for the increment at that pixel in the coordinate value, and CTYPE n for the type of coordinate. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Moon . ... Space Flight . ... By admin July 28, 2011 Posted in: Human Exploration . Scott, Worden and Irwin (Image credit: NASA) . ... This was Apollo 15. ... Scott was a veteran of Gemini 8 and Apollo 9, but his crewmates were both entering space for the first time. ... Worden and Scott took desk jobs with NASA for a few years, while Irwin left the agency to become a preacher, involving himself in several quixotic quests to locate Noah?s Ark. ...

Winer Observatory P.O. Box 797, Sonoita, Arizona 85637-0797, USA . ... The building is about 106 ft. long by 26 ft. wide and is divided into two parts: a shop area to the north, 54 ft. long by 26 ft. wide with parapet walls containing the control room, and the observatory area 52 ft. long by 26 ft. wide. ... Shop Wall Counterforts . ... The shop roof is suspended between parapet walls, that is, the walls are higher than the roof, to permit the observatory roof to roll unimpeded over the shop roof. ...