XMM-Newton Science Analysis System . ... A different approach is done via the setting withctisrcpos =Y: all event energy corrections do not use the actual RAWY coordinate but the corresponding RAWY location of the source ( SRCPOS ) as determined by the task epframes (either automatically or via setting withsrccoords =Y). ... The task epchain may be used with the setting ccds =4 withctisrcpos =Y to process only the CCD 4 where usually the bright source is located that causes the Out-of-Time events. ...

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... Bad Astronomy . ... Bad Astronomy: The North Star, Polaris, is a very bright star. Good Astronomy: Polaris is a middling-bright star, easily missed. ... He said it was close to Polaris, the North Star, but he also said it was in the East. ... It's natural, I suppose, to think that such an important star should be bright, but really, that's a conceit, like thinking that the Earth is at the center of the Universe. If more people knew just why Polaris is the North Star, this Bad Idea would stop. ...

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... 2008 December 4 . Venus in the Moon . ... Explanation: On December 1, bright planets Venus and Jupiter gathered near the young crescent Moon, an inspiring celestial scene in early evening skies around the world . But from some locations the Moon actually passed in front of Venus, interrupting the tight grouping with a lunar occultation. ... In the inset, recorded later in darkened skies over Breil-sur-Roya in southeastern France, a dazzling Venus has reappeared below the bright lunar crescent. ...

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• APOD: 2005 December 19 - Thin Rings Around Polarized Saturn
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Two major reasons: the number of stars isn't really seven (it's many more), and they all have different brightnesses, so that you see more or fewer of them depending on viewing conditions. The brightness of stars is measured on the magnitude scale, where the most prominent stars in the sky are around 1st magnitude, and the faintest you can see with your eye are about 6th. ... I think this makes it quite likely that the list will be truncated at Taygeta, giving six visible stars. ...

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• Searching the Environment around LyAlpha Absorbers
• The Pleiades
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Astronomy Picture of the Day . The Flaming Star Nebula from CFHT . ... Rippling dust and gas lanes give the Flaming Star Nebula its name. ... The bright star.. ... Inside the Eagle Nebula . ... A closer look at the Eagle Nebula, however, shows the bright region is actually a window into the center of a larger dark shell of dust. ... The telescope mirror, about the size of the Hubble Space Telescope mirror, is protected by a red covering. ... An Unusually Smooth Surface on Saturns Telesto . ...

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... More on 51 Peg: . The discovery of a Jupiter--mass planet in orbit around the solar--type star 51Peg has been reported by Michel Mayor and Didier Queloz (Geneva Observatory) on October 6th at the 9th Cambridge workshop on "cool stars, stellar systems, and the sun" held at Florence (Italy). ... Recall that the measurements of radial velocity only yield v sin i which in turn gives us M sin i. For most values of i, sin i will be greater than 0.5 and this gives a mass estimate of 0.5 Jupiter masses. ...

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• Low Surface Brightness Galaxy Gallery

... The ancient chronical said about the colour rings around the Sun and the Moon, about three suns in the sky, light columns, bright lightning, different "comets" rushing to the Earth, moving among the stars or round the Earth with the sky. All these occurrences may be divided into three categories: one that occur in the near or far space, processes going on in the Earth atmosphere under the influence of cosmic factors and at last the occurrences connected with the Earth atmosphere. ... Rainbow . ...

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... Stars come in different colours and sizes. This new picture shows the famous Red Giant star called Betelgeuse (you say the name as Beetle-Juice ). ... In the photo, the fuzzy red, blue, and purple cloud around the star is the nebula. Since the nebula isn t as bright as Betelgeuse, astronomers have to block some of the star s light to be able to photograph it. ... Our Sun will eventually become a Red Giant star like Betelgeuse but not for another 5,000,000,000 years! ...

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• http://www.eso.org/public/news/eso1422/kids/
• http://www.eso.org/public/news/eso1141/kids/
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... NICMOS Data Handbook > Chapter 5: Data Analysis > 5.4 PSF Subtraction . ... PSF subtraction for NICMOS data can be very effective, especially for images from cameras 1 and 2, thanks to a few important features of this instrument: . ... The factors are: focus variations due to OTA breathing, cold mask irregular motion (?wiggling?) on an orbital time scale, PSF color dependence. ... Table 5.5: Effect of focus variation, cold mask wiggling, and PSF color dependence on PSF subtraction. effect of: . ...

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... Space flight . ... Simulators . ... Space camp . Space Hotel . ... Virtual reality-based stand for ISS crew training is used for cosmonauts pre-training preparation at different stages of training for the space flight. ... At present cosmonauts and astronauts can work both with the SM and FGB images independently and having them in mated state. ... Info: Industry news On-line Data Company ATLAS news Events We in press Contact . Copyright 2000-2016 ATLAS Aerospace . ...

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... Like the night sky on the Earth, the martian sky hosts a plethora of astronomical phenomena occurring around the clock in a neverending space opera played out for the benefit of robotic and future human observers alike. ... Moons . Mars has two moons, Phobos and Deimos . ... Under the same conditions, Deimos would be as bright as -5, somewhat brighter than the planet Venus appears in Earth's sky. ... The moons are also eclipsed by Mars itself (a situation analogous to lunar eclipses at the Earth). ...

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... This gives us another handle on how distant the stars are. ... Stars differ not only in distance, but also in apparent brightness. ... Ranking stars by brightness . ... The brightness of the star decreases as the square of the distance. ... At what distance would a 100-watt light bulb have the same brightness as the brighter stars? ... So if the distance of the 100-watt light bulb was 5 kilometers, the distance of the brighter stars would be 10,000,000,000,000 kilometers, or about a light-year. ...

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• ASP: Accidental Astrophysics: The Devil's In the Magnitudes, Part II
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Next: Feed Polarisation Up: Calibration Previous: Calibration Index . RPFITS files do not contain any information as to whether the telescope calibration was in units of Kelvin or Janskys. On reading the data a default value is set depending on the telescope and frequency of observation. ... ASAP>scans = scantable('2004-11-23_1841-P484.rpf', unit='Jy') # Or in two steps ASAP>scans = scantable('2004-11-23_1841-P484.rpf') ASAP>scans.set_fluxunit('Jy') . ...

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• The Brightest Galaxies from HIPASS
• HIPASS Bright Galaxy Catalog
• NOISEFRQ

The "ring of fire" seen by satellite cameras around the polar caps (picture below) is probably created by electrons leaking from the tail's plasma sheet, whose magnetic field lines form a somewhat imperfect trap. ... One possible explanation involves the close association between auroral arcs and electric currents which flow along field lines between the ionosphere and distant space ( Birkeland currents ). ... That produces an extra resistance to the flow of current. ...

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• The Face on Mars
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Next: The Scenario Machine: Operational Up: Evolution of Magnetic Rotators Previous: Ejector-propeller hysteresis . ... The length of this segment is determined by the eccentricity. ... In this case no hysteresis occurs and transitions E -- P and the reverse take place in symmetrical points of the orbit. ... Here EP means a mixed state of the rotator at which it is in the ejector state during one part of the orbit, and in the propeller state during the rest of the orbital cycle. ...

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• Nomenclature
• Our wonderful group

GALAXIES cenA .tiff 40 Bright Radio Galaxy M31.tiff Nikon Andromeda Galaxy (note HII regions in spiral arms) ngc6744.tiff 40 NGC 6744 a face-on spiral clouds_20d.tiff H'blad The Magellanic Clouds our nearest neighbours Lmc_7.tiff Nikon The Large Magellanic Clouds Lmc_zoom.tiff Nikon Detail of previous image smc_7.tiff Nikon The Small Magellanic Clouds smc-zoom.tiff Nikon Detail of previous image 30dor_40_BVR.tiff 40 The 30 Dor ... B [OIII] Halpha trifid.tiff 40" The Trifid Nebula. ...

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• C/2006 P1 (McNaught)
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... Press Release Images . Individual Images . ... The right-hand image shows Hubble's close-up view of the galaxy's core, taken in December 1995 by the Wide Field and Planetary Camera 2. The bluish-purple clumps that form the ring are the clusters of infant stars. Two dark, wispy lanes of dust and a pair of blue spiral arms are just outside the star-forming ring. ... The gas is trapped inside the ring through the stars' gravitational attraction. ... Amazing Space | ...

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• Saturn's Moon Iapetus
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... X-rays are made up of photons that are emitted from stars, or quasars, or supernovae, the sun, or simply: anything that is undergoing a change either in size or temperature or giving out heat. ... in an X-ray binary star system, in which one normal star's orbit is crossed by a neutron star, when the neutron star by means of gravitational pull takes matter from the normal star X-rays form. ... Artists conception of a normal star (HDE 226868) and a black hole taking matter from the normal star. ...

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• Everyday Classroom Tools: Introduction to the Threads of Inquiry
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Top Row] . ... The quasars (powered by supermassive black holes) are so compact and bright they make a diffraction-spike pattern in the telescope's optics an optical artifact typically only produced by bright nearby stars. ... Bottom Row] . When the glare of the quasar is subtracted, researchers see evidence for collisions between galaxies. The collisions and mergers gave birth to the quasars by fueling the supermassive black hole at the core of the galaxies. ...

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• http://www.astronomy.com/sitefiles/resources/image.aspx?item=%7BCD7DD013-192F-4D9B-959A-9390C883A49B%7D
• Hubble directly observes the disk around a black hole | Astronomy.com

... The Seasons . ... Section #1 Stargazers and Skywatchers described the observed motion of the Sun across the sky, in different seasons of the year. ... If the Earth's axis were perpendicular to the ecliptic, as in the drawings here, the Sun's position in the sky would be halfway between the celestial poles, and its daily path, seen from any point on Earth, would stay exactly the same, day after day. Each point on Earth would be carried around the axis AB once a day. ... The Sun and Seasons . ...

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• Trigonometry beyond 90 degrees
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• FAQ: "The Great Magnet, the Earth"