... I present results from several seasons of photometric observations of X--ray sources in the Orion OB1a and OB1b star formation regions. The initial goal was to measure the rotational periods of several dozen pre--main sequence (PMS) stars. ... Infrared and optical data confirm that 90% of the X--ray sources are PMS and about 10% of the PMS stars may have disks. ... I find rotation periods for five stars at confidence of greater than 99.9/ greater than 99/ at much lower confidence. ...

... Киевский клуб любителей астрономии "Астрополис" > . ... Оборудование (Модераторы: LifeIsGood , Hornet ) > . Sky-Watcher 25012P & Sky-Watcher 25012P Black Diamond . ... Астрономия . ... Оборудование и телескопы . ... Ответ #40 : 22 Ноябрь 2009, 23:16:49 ? ... http://www.astromagazin.net/ru/shop/product/okuljar-sky-watcher-swa-26-mm-2-325 . ... Труба Sky-Watcher 25012P Black Diamond комплектуется окуляром 2" 28 мм. ... Последнее редактирование: 23 Ноябрь 2009, 22:15:44 от Sayberberck ? ...

... Бренд: Vitek, Тип: Чайник, Мощность: от 2100 до 2500 Вт, Объем: 1.6л - 2л, Материал корпуса: пластик, Цвет: серебристый . Чайники . ... Женская сумка из искусственной кожи . ... Цвет плафонов и подвесок: коричневый, неокрашенный . Цвет арматуры: хром . Тип поверхности плафонов и подвесок: матовый . Тип поверхности арматуры: глянцевый . Материал плафонов и подвесок: стекло, металл . Материал арматуры: металл . ... Количество плафонов: 1 . ...

Общая Астрономическая Конференция > Все про астрономическое оборудование > Астрономическое оборудование . Sky-watcher 809EQ-2 vs Celestron Powerseeker 80 EQ . ... Поиск . Сообщения за день . ... Сообщений: 14 . ... Сообщений: 2,536 . ... Drago . ... Отправить личное сообщение для Drago . ... Найти еще сообщения от Drago . ... Сообщение от Drago . ... POWERSEEKER 114 EQ (CELESTRON) . ... Nikon D200+ 18-200mm и Celestron PowerSeeker 114EQ . ... Celestron PowerSeeker 114 EQ vs ТАЛ 150 Б/У . ...

The AstroGuide . ... AstroGuide | ... AstroGuide Listing . ... See many more Astronomy Listings by: Category or Alphabet . Redlich specializes in binocular, spotting scope, and astronomical telescope repairs. ... Listed Since July 15, 1998 . ... Web Site . ... Web . www.astronomy.net . ... Unless otherwise specified, web site content Copyright 1994-2016 John Huggins All Rights Reserved . dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . are trademarks of John Huggins ...

... The HDF Project. ... How to obtain the data catalogs. Observing logs and ancillary information. Technical information on the data reduction pipeline. Technical information on image registration and combination. Technical information on source detection and photometry. HDF Clearinghouse -- followup observations and analysis. ... Hubble Deep Field Academy -- Educational Resource for Middle School students . Hubble Deep Field South The Space Telescope Science Institute home page . ...

STEP INTO THE BLUE - MEADE INSTRUMENTS PRODUCT GUIDE . ... Telescopes . LX850 Series . ... Superb optical performance coupled with time proven computerized pointing and tracking has made the LX200 ACF series a best-seller in the high-performance telescope class. ... MeadeтАЩs new LX70 Series offers high-quality German equatorially mounted telescopes with slow-motion controls and heavy-duty steel tripods. ... Dealer Locator . ... Classic 30 - Photo Tripod . ... Classic 30 Photo Tripod #608050. ...

... 5.11.1995 . ... Explanation: In October of 1963 the US Air Force launched the first in a series of satellites inspired by a recently signed nuclear test ban treaty. Signatories of this treaty agreed not to test nuclear devices in the atmosphere or in space. These "Vela" (from the Spanish verb velar, to watch) satellites were part of an unclassified program whose goal was to develop the technology to monitor nuclear tests from space. ... 1995 1996 . ... Vela Supernova Remnant in Visible Light . ...

... Tonight's Sky . ... Observing . ... Supernova showered Earth with radioactive debris . ... Gravitational wave search provides insights into galaxy evolution and mergers . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... How to watch the Geminid meteor shower . ... Only registered members of Astronomy.com are allowed to comment on this article. ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

Photon Scattering: Basic Principle of Photon Scattering . Audio Narration is available . No Scattering: Photon Source and Detector . ... For optical photons, scattering goes as wavelength to the -4 power. In the case of blue photons compared to red photons, this means that blue photons are about 10 times more likely to get scattered than red photons. ... Watch the blue photons scatter away from the detector . ... Interstellar dust make stars appear redder than they really are . ...

... Your main research interests concern dust. ... One of your main pleasures in life is going to conferences, and asking the question `have you considered dust obscuration?' after every talk by an optical astronomer, and watching their embarrassed evasions. ... Just look at any starburst galaxy: they are the most luminous objects in the local universe, but they are so dusty that the optical astronomers never even noticed them until the infra-red astronomers pointed them out! ...

... Астрофорум - астрономический портал ? ... Астрономическое оборудование и аксессуары (Модераторы: zlyden , Denk36 ) ? Sky-Watcher DOB8-2IN Стоит ли брать? . ... Ответ #20 : 01.09.2006 [20:22:12] ? ... Да и вроде бы C8-N хвалят в целом, за исключение некоторых небольших недостатков, тогда как отзывов о DOB8-2IN почти нет. ... Цитата: s-gareev от 01.09.2006 [17:30:12] . ... А насчет выноса фокуса наверно стоит толстую прокладку из-того же полиуритана сделать между фокусером и трубой. ...

The database contains references to the papers, data files and links to the Internet resources related to measurements and calculations of the optical constants in the wavelength interval from X-rays to radio domain. ... References to some useful books and reviews on the subject (e.g. the classical handbooks edited by E.D.Palik) and links to Internet collections of optical constants and personal WWW pages with related software were also placed in the database. You have arrived at our welcome page. ...

Discover the cosmos! ... December 27, 1996 . HET: The New Largest Optical Telescope . ... To peer into our cosmos' unknown depths, astronomers must deploy new tools - and the classic new tool is a larger telescope. ... HET currently has the largest single mirror of any optical telescope -- 11 meters in diameter. ... HET 's huge size, on the other hand, allows it to see very dim objects and determine their spectrum. ... About APOD > . ...

Astronotes Armagh Planetarium's Stellar Blog! ... Planets . ... Monthly Sky Notes . ... The answers can be found in Raman PrinjaБЂ™s Night Sky Watcher , a new beginnerБЂ™s guide to astronomy aimed at young observers aged seven and up. ... This is mainly an observing guide to the night sky, so while it explains the science about the objects it covers, especially the planets, it is not the book for anyone waiting a child-friendly guide to black holes, extra-solar planets or cosmology. ...

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adapted from Observe: Eclipses, published in 1979 by the Astronomical League and "Safe Solar Filters," by B. Ralph Chou, Sky and Telescope, August 1981) . ... Tape TWO pieces of film together into a sandwich, and tape this over the opening in the cardboard. ... The cardboard frame will act as a shade from the bright Sun, while you safely observe through the film sandwich. ... Undeveloped film is not safe. ... tape . ... At the end of one of the tubes, tape the aluminum foil, and make a tiny pinhole. ...

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The Jazz Butcher - Our Friends The Filth . ... Our friends the filth (female: smile ) sample: [ cheering ] He's a marine commander in a submarine world And he knows what he's after he's a tank driving man He talked to orders they told him what was He's wearing flippers he's got an optical correcter on his goggles His mind's a blank he's only thinking of his duty to the folks back home He watches the boat as he floats down the Danube He's been making a living giving businessmen heck ...