stellar magnitudes

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• Timeline of stellar astronomy — Timeline of stellar astronomy* 134 BC Hipparchus creates the magnitude scale of stellar apparent luminosities * 185 AD Chinese astronomers become the first to observe a supernova, the SN 185 * 964 Abd al Rahman al Sufi (Azophi) writes the Book of …   Wikipedia

• Catalog of Stellar Identifications — The Catalog of Stellar Identifications (CSI) is a star catalog which was constructed to facilitate cross referencing between different star catalogs. It contains designations and basic data for, as of 1983, approximately 440,000 stars, and was… …   Wikipedia

• 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

• List of most luminous stars — Below is a list of stars arranged in order of decreasing luminosity (increasing bolometric magnitude). Accurate measurement of stellar luminosities is quite difficult in practice, even when the apparent magnitude is measured accurately, for three …   Wikipedia

• Leavitt, Henrietta Swan — ▪ American astronomer born July 4, 1868, Lancaster, Mass., U.S. died Dec. 12, 1921, Cambridge, Mass.       American astronomer known for her discovery of the relationship between period and luminosity in Cepheid variables (Cepheid variable),… …   Universalium

• Absolute magnitude — In astronomy, absolute magnitude (also known as absolute visual magnitude) is the apparent magnitude an object would have if it were at a standard luminosity distance (10 parsecs, 1 AU, or 100 km depending on object type) away from the observer,… …   Wikipedia

• Leavitt , Henrietta Swan — (1868–1921) American astronomer Henrietta Leavitt was born the daughter of a Congregational minister in Lancaster, Massachusetts. Her interest in astronomy was aroused while she was at Radcliffe College (then the Society for the Collegiate… …   Scientists

• List of brightest stars — Bright stars are bright because they have high luminosities and/or they are nearby. Below are the 91 brightest individual stars as seen from Earth in visible wavelengths (apparent magnitude less than or equal to +2.50). The number of observable… …   Wikipedia

• North polar sequence — The North polar sequence is a group of 96 stars that was used to define stellar magnitudes and colors. The cluster of stars lies within two degrees of the Northern Celestial pole, which makes them visible to everyone on the northern hemisphere.… …   Wikipedia

• Orion 1 and Orion 2 Space Observatories — The Orion 1 Space Observatory and Orion 2 Space Observatory were space observatories installed in spacecraft launched by the space program of the Soviet Union during the 1970s. Contents 1 Orion 1 1.1 Specifications 2 Orion 2 …   Wikipedia

• stel|lar — «STEHL uhr», adjective. 1. of or having to do with the stars or a star; like a star: »stellar magnitudes. SYNONYM(S): astral, sidereal. 2. Figurative. chief; principal: »to play the stellar role in a government. 3. of or having to do with a star… …   Useful english dictionary