photographic magnitude — noun : the magnitude of a celestial body as determined by observations with an ordinary blue sensitive photographic plate … Useful english dictionary
Magnitude — may refer to: In mathematics: Magnitude (mathematics), the relative size of a mathematical object Magnitude (vector), a term for the size or length of a vector Scalar (mathematics), a quantity defined only by its magnitude Euclidean vector, a… … Wikipedia
Magnitude (astronomy) — For other uses, see Magnitude (disambiguation). Magnitude is the logarithmic measure of the brightness of an object, in astronomy, measured in a specific wavelength or passband, usually in optical or near infrared wavelengths. Contents 1… … Wikipedia
Photographic film — This article is mainly concerned with still photography film. For motion picture film, please see film stock. Photographic film is a sheet of plastic (polyester, nitrocellulose or cellulose acetate) coated with an emulsion containing light… … Wikipedia
Apparent magnitude — Asteroid 65 Cybele and 2 stars with their magnitudes labeled The apparent magnitude (m) of a celestial body is a measure of its brightness as seen by an observer on Earth, normalized to the value it would have in the absence of the atmosphere.… … Wikipedia
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
apparent magnitude — noun : the observed or apparent brightness of a celestial body expressed on the magnitude scale and varying in accordance with the spectral sensitivity of the means of observing (as the eye, a photographic material, or an instrument) * * *… … Useful english dictionary
photovisual magnitude — noun : the magnitude of a celestial body that is determined by observations with a photographic plate and filter combination giving nearly the same yellow green sensitivity as the human eye and that is nearly equal to the visual magnitude … Useful english dictionary
Cape Photographic Durchmusterung — ▪ star catalog star catalog listing more than 454,000 stars of the 11th magnitude or brighter, between 18° south declination and the south celestial pole. The photographic plates required were made between 1885 and 1890 at Cape Town, South… … Universalium
astronomical map — Introduction any cartographic representation of the stars, galaxies, or surfaces of the planets and the Moon. Modern maps of this kind are based on a coordinate system analagous to geographic latitude and longitude. In most cases, modern… … Universalium
