optical outbursts

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• OJ 287 — Observation data (Epoch J2000) Constellation Cancer Right ascension 08h 54m 48.9s[1] …   Wikipedia

• flare star — Astron. a dwarf star that exhibits sudden increases of magnitude similar to solar flares. Also called UV Ceti star. [1950 55] * * * Star that varies in brightness repeatedly but sporadically, sometimes by more than one magnitude, within a few… …   Universalium

• star — starless, adj. /stahr/, n., adj., v., starred, starring. n. 1. any of the heavenly bodies, except the moon, appearing as fixed luminous points in the sky at night. 2. Astron. any of the large, self luminous, heavenly bodies, as the sun, Polaris,… …   Universalium

• Physical Sciences — ▪ 2009 Introduction Scientists discovered a new family of superconducting materials and obtained unique images of individual hydrogen atoms and of a multiple exoplanet system. Europe completed the Large Hadron Collider, and China and India took… …   Universalium

• Cataclysmic variable star — Cataclysmic variable stars (CV) are stars which irregularly increase in brightness by a large factor, then drop back down to a quiescent state. They were initially called novae, from the Latin new , since ones with an outburst brightness visible… …   Wikipedia

• Eta Carinae — Starbox begin name=Eta CarinaeStarbox image caption=Hubble Space Telescope image showing Eta Carinae and the bipolar Homunculus Nebula which surrounds the star. The Homunculus was partly created in an eruption of Eta Carinae whose light reached… …   Wikipedia

• Z Andromedae — Starbox begin name=Z Andromedae Starbox image caption = Z Andromedae Starbox observe epoch=J2000 ra=23h 33m 39.9505s dec= +48° 49 prime; 05.947 Prime; appmag v=10.53 constell=Andromeda Starbox character class=M6.5 b v=1.1 u b= variable=symbiotic… …   Wikipedia

• Saturn — /sat euhrn/, n. 1. an ancient Roman god of agriculture, the consort of Ops, believed to have ruled the earth during an age of happiness and virtue, identified with the Greek god Cronus. 2. Astron. the planet sixth in order from the sun, having an …   Universalium

• Soft X-ray transient — Soft X ray transients (often abbreviated to SXT) are also known as X ray novae . Typical SXTs are usually very faint, or even unobservable, in X rays and their apparent magnitude in the optical wavelengths is about 20. This is called the… …   Wikipedia

• Germany — /jerr meuh nee/, n. a republic in central Europe: after World War II divided into four zones, British, French, U.S., and Soviet, and in 1949 into East Germany and West Germany; East and West Germany were reunited in 1990. 84,068,216; 137,852 sq.… …   Universalium

• X-ray astronomy — X rays start at 0.008 nm and extend across the electromagnetic spectrum to 8 nm, over which the Earth s atmosphere is opaque. X ray astronomy is an observational branch of astronomy which deals with the study of X ray observation and detection… …   Wikipedia