... Bad Astronomy . ... Bitesize Astronomy . ... Here's a question for you: if you were to place the Moon randomly anywhere in the sky, on average, how many stars would it cover up? ... We found that the sky is about 40,000 square degrees . ... The area of a circle is pi * radius^2, so the Moon's area is pi * (1/4)^2=0.2 square degrees. So the number of stars in an area the size of the Moon is 0.15 stars/square degree * 0.2 square degrees=0.03 stars per Moon area. ... 2008 Phil Plait. ...

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... MICROSCOPES . ... SURGICAL MICROSCOPES . ... Home Products Microscopes Multiscopes EA-Series Achromats and Plan Achromats . EA-SERIES ACHROMATS AND PLAN ACROMATS OBJECTIVES . EA-Series Objectives (Mechanical Tube Length: 160mm; Parfocal Distance: 33mm) . ... Field Flatness . ... EAB Achromats . ... Plan . ... Flat Field . 0.40 . ... Oil Immersion . ... EAP Achromats for Phase Contrast . ... EAF Achromats for Epi-Fluorescence . ... Water Immersion . ...

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• OEM Components
• OEM Optical Components
• INVERTOSCOPE

... Dust in Nuclei of Galactic Bulges . ... WFPC2 of 20 nuclei of nearby galactic bulges of types S0-Sbc. ... Bulges of spiral galaxies are generally seen as small elliptical galaxies in the center of a large spiral. ... Here we show first results of a color study of the centers of galactic bulges. ... With these three bands we can make the red I - H color, primarily sensitive to extinction by dust and old stellar population gradients, and the B - I color, especially sensitive to recent star formation. ...

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• NICMOS/HST H-band (F160W) Images of the 30 Dor Starburst Cluster
• The Old Stellar Population of NGC 1569 from NICMOS data
• The Formation and Evolution of LMC Rich Star Clusters: NGC 1818

... 000, 1­12 (2009) Printed 11 February 2010 A (MN L TEX style file v2.2) Analytical approximations of K -corrections in optical and near-infrared bands I1gor V. Chilingarian1 2 ,2,3 , Anne-Laure Melchior 1,4 and Ivan Yu. ... Received 2010 February 01; in original form 2009 August 14 ABSTRACT To compare photometric properties of galaxies at different redshifts, the fluxes need to be corrected for the changes of effective rest-frame wavelengths of filter bandpasses, called K -corrections. ... Table 1. ...

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• K-corrections calculator: download IDL, Python and C code

... Fermilab experiment weighs in on neutrino mystery . ... Scientists of the MINOS experiment at the Department of Energyт??s Fermi National Accelerator Laboratory announced June 24 the results from a search for a rare phenomenon, the transformation of muon neutrinos into electron neutrinos. ... The experiment uses two almost identical detectors: the detector at Fermilab is used to check the purity of the muon neutrino beam, and the detector at Soudan looks for electron and muon neutrinos. ... Fermilab...

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• A star explodes and turns inside out | Astronomy.com
• APEX turns its eye to dark clouds in Taurus | Astronomy.com
• Dark energy update | Astronomy.com

Dynamic Shack-Hartmann System RAPID V. G. Orlov, V. V. Voitsekhovich Instituto de AstronomМa, UNAM, MИxico CONACYT project E9507-1020P UNAM PAPIIT IN104910 Telescopes OAN OAN- SPM 2.1m telescope 1.5m telescope 0.84m telescope 2.1m telescope OAN-Tonanzintla 1m telescope Astronomical site SPM Observing statistics 1982-2002 (Tapia+ 2007 ) Photometric nights : 64.1% Spectroscopic ... Rapid - Dynamic Shack-Hartmann All modern telescopes demand installation of adaptive system. ...

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• http://site2010.sai.msu.ru/static/doc/GHerriot_site2010.ppt.pdf
• http://site2010.sai.msu.ru/static/doc/VKornilov_site2010.pdf

... public class EDM . ... Euclidean Distance Map: The value of each pixel is the distance to the nearest background pixel (for background pixels, the EDM is 0) - Ultimate Eroded Points (UEPs) are maxima of the EDM. ... static int . ... Unit in old make16bitEDM: this pixel value corresponds to a distance of one pixel. static int . ... int . ... For compatibility with previous versions of ImageJ only. public FloatProcessor makeFloatEDM ( ImageProcessor ip, int backgroundValue, boolean edgesAreBackground)...

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... Planets . ... Stars . Exoplanets . ... Most exoplanets so far discovered fall into the category of тАШhot JupitersтАЩ, these are giant planets orbiting very close to their parent star. ... Note that we have discovered so many hot Jupiters because they are the easiest type of planet to find, they are not necessarily particularly common in the galaxy. ... Subsequently several similar hot and€а fuzzy worlds have been discovered the same way, proving this that this planet is not a one-off oddball. ...

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• Leo, Virgo, Bootes and the May Night Sky Wonders | Astronotes
• Vulcan: ghost planet | Astronotes
• Sky Wonders for January 2013 | Astronotes

... Go to This section of the glossary . ... APHELION : The point in a planet's orbit where it is farthest from the sun. ... It melts at 83.95 K, and boils at 87.45 K. Many people don't realize that argon makes up a full 1% of our atmosphere, while carbon dioxide is only a fraction of a percent of our atmosphere. ... COMET: An object moving about the sun in an eccentric orbit and composed of materials which, on warming up near the sun, form a "tail" which always points away from the sun. ...

190. Best Celestial Events of 2006 ? Amateur Astronomers Association of New York

191. AAL Homepage