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photometric study

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  • 10199 Chariklo — A comparison of 10199 Chariklo (left), Pluto (center), and the Moon (right), based on mean radius. Discovery Discovered by …   Wikipedia

  • Orion OB1 Association — The Orion OB1 stellar association is a contingent group of several dozen hot giant stars of spectral types O and B. Associated are thousands of lower mass stars, and a (smaller but significant) number of protostars. It is part of the larger Orion …   Wikipedia

  • NGC 1399 — Галактика …   Википедия

  • Messier 13 — This article is about the globular cluster M13. For the galaxy cluster in Hercules, see Abell 2151. Messier 13 The heart of Hercules Globular Cluster; Credit: ESA/Hubble and NASA …   Wikipedia

  • Dwarf galaxy — UGC 9128 is a dwarf irregular galaxy, it probably contains only around one hundred million stars. A dwarf galaxy is a small galaxy composed of up to several billion stars, a small number compared to our own Milky Way s 200 400 billion stars. The… …   Wikipedia

  • V1494 Aquilae — or NOVA Aquilae 1999 b Observation data Epoch J2000.0      Equinox J2000.0 Constellation Aquila Right ascension 19h 23m 05.38s Declination +0 …   Wikipedia

  • NGC 6791 — Detail from the Kepler image showing NGC 6791. Celestial north is to the left.a Observation data (J2000 epoch) …   Wikipedia

  • (55637) 2002 UX25 — Infobox Planet bgcolour=#FFFFC0 name=mp|(55637) 2002 UX|25 discovery=yes discoverer=Spacewatch discovered=October 30, 2002 mp name=mp|(55637) 2002 UX|25 alt names= none mp category=Trans Neptunian object epoch=June 14, 2006 (JD 2 453 900.5)… …   Wikipedia

  • Megamaser — A megamaser is a type of astrophysical maser, which is a naturally occurring source of stimulated spectral line emission. Megamasers are distinguished from astrophysical masers by their large isotropic luminosity. Megamasers produce roughly 103… …   Wikipedia

  • Opposition effect — The opposition effect (also opposition spike, or opposition surge) is the brightening of a rough surface, or an object with many particles, when illuminated from directly behind the observer. It is so named because the reflected light from the… …   Wikipedia

  • James McMahon (astronomer) — James McMahon is an American amateur astronomer, acknowledged for his visual observations of asteroid occultations. In 1978 his observation of the occultation of the asteroid 532 Herculina with the star SAO 1220774, together with photometric… …   Wikipedia

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