narrow band photometry

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• Photometry (astronomy) — Photometry is a technique of astronomy concerned with measuring the flux , or intensity of an astronomical object s electromagnetic radiation. Usually, photometry refers to measurement over large wavelength bands of radiation; but, when not only… …   Wikipedia

• Strömgren photometric system — (uvby) (sometimes also referred as Strömgren Crawford photometric system) is four colour medium band photometric system (plus H beta filter) for stellar classification. It was pioneered by the Danish astronomer Bengt Strömgren in 1956 and… …   Wikipedia

• Light pollution — This article is about light pollution in the visible spectrum. For information on pollution in the radio spectrum, see radio spectrum pollution. This time exposure photo of New York City at night shows skyglow, one form of light pollution …   Wikipedia

• Luminous efficacy — is a measure of how well a light source produces visible light. It is the ratio of luminous flux to power. Depending on context, the power can be either the radiant flux of the source s output, or it can be the total electric power consumed by… …   Wikipedia

• Project Cyclops — [http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19730010095 1973010095.pdf NASA Technical Report CR 114445 Project Cyclops: A design study of a system for detecting extraterrestial intelligent life] . 14.5 MB pdf file.] was a 1971 NASA… …   Wikipedia

• Observational astronomy — Mayall telescope at Kitt Peak National Observatory Observational astronomy is a division of the astronomical science that is concerned with getting data, in contrast with theoretical astrophysics which is mainly concerned with finding out the… …   Wikipedia

• NASA Infrared Telescope Facility — The NASA Infrared Telescope Facility atop Mauna Kea …   Wikipedia

• Photometric system — In astronomy, a Photometric system is a set of well defined passbands (of filters), with a known sensitivity to incident radiation. The sensitivity usually depends on the optical system, detectors and filters used. For each photometric system a… …   Wikipedia

• Climate of Uranus — Uranus southern hemisphere in approximate natural colour (left) and in higher wavelengths (right), showing its faint cloud bands and atmospheric hood as seen by Voyager 2 The climate of Uranus is heavily influenced by both its lack of internal… …   Wikipedia

• Uranus — This article is about the planet. For other uses, see Uranus (disambiguation). Uranus   …   Wikipedia

• magnitude — magnitudinous /mag ni toohd n euhs, tyoohd /, adj. /mag ni toohd , tyoohd /, n. 1. size; extent; dimensions: to determine the magnitude of an angle. 2. great importance or consequence: affairs of magnitude. 3. greatness of size or amount. 4.… …   Universalium