... NGC 281 (Sharpless 184) is a bustling cradle of star formation about 10,000 light years away. ... The central stars are being formed from the surrounding gas, which emits a large amount of hydrogen alpha (Ha) light after being excited by stellar radiation. ... The dark areas overlaying the brighter ones in the middle of the image are dense clouds of gas known as Bok Globules. ... 4) Image registration . ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

... Research areas . ... Events III All-Russian Research and Application Conference 'Actual Issues of Research in Avionics: Theory, Service, Development' - 'AVIATOR' . ... e-mail: aviator.vrn@mail.ru . ... State and development trends of electrical equipment and electro-optical systems of aircraft. ... Current state and development trends of information and management complex for aircraft. ...

... We have assumed a constant in time star formation rate and the total number of stars in the Galaxy, , to be such that the total mass of the galaxy is ; assuming the Salpeter mass function   , we get . ... This number agrees with a standard estimation of the galactic star formation rate of order of per year. In each run of calculations, we trace the evolution of binaries with initial parameters randomly distributed according to the chosen initial laws. ...

... part 1 | ... Regular orbits of planets of the Solar system during their formation, . ... Radius of the orbit in perigelion . Regular orbit of a planet in time of its formation from . Divergence with actual radius . ... Name . ... orbit . ... Radius . ... Mercury . ... 1,3487 . ... 1,8191 . ... X-planet)* . ... Orbits of prospective planets destroyed in present . Orbits, on which planets of Mercury, Moon and (DePho) * presumably were before. | ...

... Brown dwarfs are bodies intermediate in mass between stars and planets. ... Recent studies have shown that young brown dwarfs, like young stars, may be surrounded by accretion disks. In some cases these disks appear to be highly evolved, suggesting they are in the early phases of planetary formation. As accretion is often accompanied by outflows in newborn stars, we have been searching for jets from young brown dwarfs. ...

... Stars . ... Straight away the three stars in his belt will grab your attention, followed by the glittering white star Rigel in his left foot and the bright orangish star Betelgeuse in his right shoulder (assuming Orion is standing facing us and not with his back to us). ... Orion Belt?s with the stars Alnitak, Alnilam and Mintaka. ... In short, Orion was a big, loud giant of a man and indeed a mighty hunter, he also inherited some aquatic superpowers from his father who was the sea god Neptune. ...

... Tonight's Sky . ... Observing . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . ... How do light pollution filters work? Do they actually help? ... Light pollution reduction (LPR) filters work because many outdoor lighting sources do not shine evenly across the visible spectrum. ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

... Poitiers, 23 January 2007 Science Vision for European Astronomy in the Next 20 Years 2 Is the initial mass function universal? ... High Poitiers, 23 January 2007 Science Vision for European Astronomy in the Next 20 Years 4 Do we understand stellar structure and evolution? ... Interferometry in near infrared and radio: measuring radii and resolving stellar surface Science Vision for European Astronomy in the Next 20 Years Poitiers, 23 January 2007 5 What is the life-cycle of the ISM and Stars? ...

... Many massive planets contrary to Jupiter have large eccentricities of orbits. ... Another problem is to study the conditions and boundaries of stable, regular motions of small mass planet in systems having `Jupiter' with large orbital eccentricity as well as properties of regular, stable, and irregular, chaotic motions. ... The regular eccentricity evolution described above demonstrates that stable quasi--circular orbits of small planet are unusual. ...

... The Drake Equation: Adding a METI Factor . ... METI (Messaging to Extra-Terrestrial Intelligence) is an activity, which I believe to be an inherent attribute of advanced civilizations. In order to account for the true prevalence of communicative civilizations (that is, those that engage in METI), I suggest we introduce a METI factor f m into the classical Drake Equation . ... f p = The fraction of those stars with planetary systems . ... Then the METI factor f m should be quite small, about 0.01. ...

Class 1 Introduction, Background History of Modern Astronomy The Night Sky, Eclipses and the Seasons Kepler's Laws Newtonian Gravity General Relativity Matter and Light Telescopes Class 2 Solar System Characteristics Formation Exosolar Planets Class 3 Stars The S un Stellar Evolution of Low and High Mass Stars Deaths of Stars Exotic Stars Class 4 Galaxies Galaxy Classification Formation of Galaxies Galactic ... Low mass stars live and die differently than high mass stars. ...

... The PROS system provides the capability to keep track of the uncertainties in image files through error arrays. ... There is a task, errcreate , that will estimate the errors in an image and produce an error array. ... Some tasks that transform images, such as imsmooth, imcompress , and imreplicate have the option to produce a resultant error array, derived from the original image's error array. Note, however, that the imcalc task does not produce an error array. ...

In the PROJECT we are using the following peculiar . features of RATAN-600 . ... Brightness temperature sensitivity being equal to the antenna temperature sensitivity .. ... Receiver system .. ... Using aperture averaging effect. dual- beam and dual (multi-) frequency filtration, we demonstrated full filtration of the atmosphere noise down to the receiver noise at all scales of acoustics peaks ( Fig.1 , Fig 2 ). ... We select this frequency as the central one in our project. ... Antenna surface . ...

... At each pixel, then, the task has available values of the actual number of events found within the box and values of the expected number of background events within the same box. Considering for a moment just the values from a single band in isolation, if there were no sources in the field, then the probability of finding counts in this box would be given by the familiar Poisson expression . ... First, the values of LIKE for the individual bands are summed. ...

. Here it seems you see only diffuse top clouds. But actually i'd like to show you the optical effect known as "Glory". It consists in formation of colored circles around the shadow of the plane . hovering under the clouds.

Variations of total ozone content and lower ozone stratosphere temperature in Antarctic Region during winter-spring period A.V. Grytsai National Taras Shevchenko University of Kyiv Astronomy and Space Physics Department assen@univ.kiev.ua Data, used in the work work Total ozone: Total Ozone Mapping Spectrometer (TOMS) measurements during 1979 - 2005 and Ozone Monitoring Instrument (OMI) ones for 2006, for http://toms.gsfc.nasa.gov/ftpdata.html. ... A long-term TOC decrease is significant. ...

Электронная библиотека астронома-любителя. ... библиотека . архив RSN . ... Ru.Space.News: . Ноябрь 2003 . ... I recently read an article that I found initially disturbing, but after reading the information on this site regarding the sun, I feel much more calm. ... A few people have requested more information about the temperature of the sun. The temperature at the center of the sun is about 16 million degrees Kelvin (27 million degrees Fahrenheit), as stated in the article. ...

... 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. ...

. This is the first one I have actually out and out missed. I had even checked it against a second generation DSS scan and just decided it was a non-symetrical nucleus. The estimated magnitude is about 15.7. Mike Schwartz , Director . Tenagra Observatories, Ltd. Cottage Grove, OR 97424 . Back to Bright Supernovae . Back to Supernova 1999an . David Bishop Last modified: Fri Mar 12 12:20:43 EST 1999

This widget allows you to adjust the secondary mirror focus. The seconary focus is actually an offset to the secondary mirror piston computed by the TCC (as it tries to compensate for changing temperature and altitude). ... Set... : set a new absolute secondary focus. ... XX and + XX buttons: offset the secondary focus by the amount shown. The mirror is moved as soon as you release the button. Increment Menu (25/50/100) : set the increment shown on the - XX and + XX buttons. ...