In version 2 of the data reduction, we include frames where there is some visible scattered light, but where the background is still reasonably low (not more than a few times the minimum background). ... Briefly, the scattered light subtraction was done by registering the bright and dark images, subtracting the dark from the bright to remove the source, smoothing to remove any residual sources left over after the subtraction, and subtracting this smoothed sky image from the bright frame. ...

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• Surface Brightness of Background Light
• The Hubble Deep Field -- Schedule 11/10/95
• Charge Transfer Efficiency

... This paper describes the main algorithms used by the Einstein Level One processing to create the exposure masks and the background maps for Einstein IPC images, and how these algorithms were recreated in the IRAF environment. Our goal was to recreate the algorithms used by the Level One Processing to create exposure masks and background maps for Einstein Image Proportional Counter (IPC) data (cf. sections 2.5 and 2.7 of Harnden et al. ...

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In this gallery are many images of Low Surface Brightness Galaxies which have recently been discovered and analyzed. ... The central surface brightness of this galaxy is 24.28 . Malin 2 This galaxy is another huge disk galaxy with a scale length of 15 kpc and a redshift of 15000 km/a. The high surface brightness knot in one of its spiral arms actually has the same color, luminosity and H-alpha equivalent width as the entire Large Magellanic Cloud . ... Truly it is a Low Surface Brightness Galaxy. ...

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• Galaxy Gallery Page II
• Plate Tectonics
• Formation of the Earth's Moon

... Люстра Альфа, MW-LIGHT Данная люстра сочетает в себе практичность, утонченность и универсальность. ... Эта люстра подчеркнет благородство и сдержанность комнаты, в которой будет использоваться, поэтому она идеально подойдет для рабочего кабинета, либо для рабочей зоны в общей комнате. ... Люстры . ... Брюки спортивные adidas Originals. ... Линейка: Originals . ... Размер INT: W30 / L32, W32 / L32, W32 / L34, W34 / L32, W34 / L34, W36 / L32, W36 / L34, W31 / L32, . Брюки-чинос . ...

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• Куртка утепленная adidas Originals - adidas Originals - adidas Originals Шапка
• Брюки спортивные adidas Originals - adidas Originals - adidas Originals Ботинки
• Часы Disney - Disney - Disney Платье из струящейся ткани с рисунком

... ESO is building what will be the World's largest optical telescope array, The Very Large Telescope (VLT). The VLT Project organisation is responsible for the design and construction of the Unit Telescopes, including enclosures, optics, adapter-rotators and coating unit. ... Unit Telescopes Overview - This page is outdated, an update is in process. ... Secondary mirror (M2 Unit) - This page is outdated, an update is in process. ... Coating Unit - This page is outdated, an update is in process. ...

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• The Brightness of the Night Sky
• ArtistтАЩs impression of bright exozodiacal light
• ArtistтАЩs impression of bright exozodiacal light | ESO

Sternberg Astronomical Institute, Moscow University, . Moscow, Russia . Supernovae make us brighter .. Search russian astronomical resources . Mirror of International Supernovae Network ( Original site ) . Catalogue of Supernovae Stars . HTTP access to SAI Catalogue of Supernovae Stars . SAI SN Light Curves Online . ... Sternberg Astronomical Institute ( in Russian ) . ... Astronet - Russian Astronomical Network . ... Russian Foundation for Basic Research . ...

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• Hands On; Lighting Effects2, The Bulkhead Project
• APOD: 2003 August 18 - Bright Lights, Dark City
• APOD: 2002 February 6 - The Cosmic Infrared Background

Supernovae 2016adj in NGC 5128 . This page is devoted to information on Supernova 2016adj in NGC 5128 (= Centarus A). ... Discovered by Peter Marples and Greg Bock ( BOSS ) (Australia). ... TNS 2016adj . TNS 2016adj spectra . ... 2016/01/20.000 . ... 2016/01/21.360 . ... 2016/01/22.329 . ... 2016/01/29.277 . ... Prediscovery . ... Prediscovery Color, Wow without inset Black and White version . ... Peter Marples and Greg Bock . ... Peter Marples . ... Back to Bright Supernovae - 2016 . ...

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• Supernova 2002fk in NGC 1309
• Supernova 1999an in IC 755
• Supernova 1998es in NGC 632

Next: BASIC PROPERTIES Up: R CORONAE BOREALIS STARS Previous: INTRODUCTION . RCB stars are named after a star just visible to the naked eye in the constellation of Corona Borealis. RCrB was discovered by Edward Pigott (1797), an English amateur astronomer, who had been observing a star in the `Northern Crown' for over a decade. ... Since 1795, other RCB stars have been discovered and their properties have been carefully observed. ...

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• Historical Background
• Light Pollution at Armagh Observatory
• Objects in the Sky

Measurement of Sky Brightness at the Iranian National Observatory Davoud Afshari1 and Sadollah Nasiri1,2 1Physics Department, Zanjan University, Zanjan 45195-313, Iran; Institute for Advanced studies in Basic Science (IASBS), Zanjan 45195-1159, Iran; Measurement of light pollution 2 Introduction Among 34 candidate sites at the central part of the country, 5 sites namely Garkesh (in Kashan ), Kolahbarfi(in Kashan ), Deynava (in ... One of these is light pollution. ...

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... Seen to be in the final stages of a titanic galaxy merger, the pair lies some 300 million light-years distant toward the constellation Cancer. A View from Next Door . ... Located just next door, Alpha Centauri is the closest star system to the Sun. ... What's happening around that star? An unusual spiral structure has been discovered around the Milky Way star R Sculptoris, a red giant star located about 1,500 light years away toward the constellation of the Sculptor (Sculptoris). ...

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• Bright Lights, Dark City
• The Cosmic Infrared Background
• Астронет > Bright Lights, Dark City

... self-absorption - the absorption of light shining on an object by a process similar to that which produced the light originally; if a cloud emits less light than it absorbs from other clouds behind it, this net loss of light, termed self-absorption , causes the foreground cloud to appear darker than the background field (the term is from spectroscopy, where small absorption dips sometimes occur in larger emission lines, making the latter look as if it is absorbing part of itself) . ... HISA Main ...

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• The Pleiades
• Thesis Figures

On' failures in the NIRSpec MEMS ST-ECF Instrument Science Report NGST 2002-02 The effects of `on' failures in a MEMS array for the NGST NIRSpec Santiago Arribas, Robert Fosbury Peter Jakobsen --1-- ST-ECF Instrument Science Report NGST 2002-02 The effects of `on' failures in a MEMS array for the NGST ... Assuming that the spectrum of a single facet uses 2000 detector pixels, only 0.01% of `on' failures is acceptable (i.e., 400 facets in a 2k в 2K MEMS array). ...

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• No Title

You Can Make Stellar Images Brighter . Articles | ... A few months ago I wrote an article titled "You Can’t Make Them Brighter". So why am I now writing that you can make them brighter. ... The image of a focused star is actually a small disk called the Airy disk, named after the 19 th century scientist Sir George Airy. ... For a given aperture, a smaller Airy disk means that the light is focused to a smaller disk and is therefore brighter. ... www.astronomy.net . About Astronomy Net | ...

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• You Can't Make Stellar Images Brighter - an Astronomy Net Article

... begin{itemize} \item[1.] Get source time serie. \item[2.] Check time serie integrity. \item[3.] ... Create corrected light curve. \ end { itemize } Extensions: \ begin { itemize } \ item [6a:] Absolute corrections . \ begin { itemize } \ item [.1] Calculate spectrum. \ item [.1] Call arfgen. \ item [.2] Apply absolute corrections . \ end { itemize } \ item [6b:] Introduce background time serie . \ begin { itemize } \ item [.1] Check background binning. \ item [.2] Apply ...

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• Future developments
• Introduction
• Scattered-light algorithm

... Telescopes ћ Binoculars ћ Microscopes . Meade Ultra-High Transmission coatings (UHTC ) Group . ... Meade Standard Coatings: The optical surfaces of all Meade telescopes include high-grade optical coatings fully consistent in quality with the precision of the optical surfaces themselves. ... These specialized, and extremely advantageous, coatings are offered here as the Meade Ultra-High Transmission Coatings (UHTC) group, a coatings group available optionally on many Meade telescope models. ...

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• Meade Series 4000 Photo-Visual Color Filters

... Copyrightї1997 Bob Yen (byen@ix.netcom.com) (http://www.comet-track.com/hb/hb.html) . ... Information on Comet Hale-Bopp for the Non-Astronomer Hale-Bopp rotates about twice a day (3/14/97) . ... The Comet Observation Home Page was been selected to receive the Griffith Observatory Star Award for the week of February 2 - 8, 1997 for excellence in promoting astronomy to the public through the World Wide Web. ... Typically, about 1,000 individual users/computers access this page every day. ...

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• Comet Ephemerides

... The formation of multiple images of a distant quasar by the gravitational lensing effect of a foreground galaxy may be very simply, and faithfully, accounted for by a wine glass experiment. Figure 1. In the wine glass experiment, a bright compact light source (at the top of the photo) serves as a distant quasar. The wine glass on the table distorts the light rays from the "quasar" and produces a caustic having with a triangular shape (see enlargement in Figure 3 ). ...

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• ASP: Black Holes to Blackboards: Seeing the Light
• ASP: An Ancient Universe - The Age of Light from the Most Distant Galaxies
• ASP: Light Pollution

... Bad Astronomy . Misconceptions . ... Bad Astronomy : "We're light years more advanced than our competition!" ... Even the closest astronomical object, the Moon, is 400,000 kilometers away! ... A beam of light will travel 9,500,000,000,000 kilometers in one year. This distance is defined as a light year ; the distance light travels in a year. ... This is another example of Bad Astronomy; like a light year, a parsec is a unit of distance, not time (to be specific, it equals 3.26 light years) . ...

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• Phil Plait's Bad Astronomy: Bitesize Astronomy
• Phil Plait's Bad Astronomy: Mad Science
• Phil Plait's Bad Astronomy: Bad TV

Next: UBV light curves (Duerbeck Up: Optical light curves Previous: UBV light curves (Lyutyi, . UBV system; U,B,V photometry of A0620-00 #Ref: AJ 81, 104 ( 1976 ) S. van den Bergh # V, B-V, U-B наблюдения в системе UBV на фотоумножителе #errors: не приведены # - taking into account fast fluctuations of brightness and color with # amplitude ~ 0.1 mag, at least during half an hour (Lyutyi, 1976 ) = # errors sre set to be ...

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• UBV light curves (Duerbeck and Walter, 1976)
• UBV light curves (Lyutyi, 1976)
• B light curve (Lloyd et al., 1977)

... cross-sections, phase function, etc. core-mantle spheres . ... cross-sections, phase function, etc. n-layered spheres . ... cross-sections, phase function, etc. homogeneous infinite cylinders (large sizes) . ... cross-sections, phase function, etc. homogeneous infinite cylinders . ... cross-sections, phase function, etc. core-mantle infinite cylinders . ... cross-sections, phase function, etc. homogeneous spheroids . ... cross-sections, scattering matrix?, etc. homogeneous and n-layered ellipsoids ....

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• Database of Optical Constants -- Misc: SVM code(s)
• Database of Optical Properties -- Level: subpage
• Database of Optical Properties -- Level: database