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- UBV_photometric_system abstract "The UBV photometric system, also called the Johnson system (or Johnson-Morgan system), is a wide band photometric system for classifying stars according to their colors. It is the first known standardized photoelectric photometric system. The letters U, B, and V stand for ultraviolet, blue, and visual magnitudes, which are measured for a star in order to classify it in the UBV system. The choice of colors on the blue end of the spectrum is because of the bias that photographic film has for those colors. It was introduced in the 1950s by American astronomers Harold Lester Johnson and William Wilson Morgan. A 13\" telescope and the 82\" telescope at McDonald Observatory were used to define the system.The filters are selected so that the mean wavelengths of response functions are 364 nm for U, 442 nm for B, 540 nm for V. The zero point of the B−V and U−B color indices were defined such as to be about zero for A0 main sequence stars not affected by interstellar reddening.The UBV system has some disadvantages. The short wavelength cutoff of the U filter is defined mainly by the terrestrial atmosphere rather than the filter itself; thus, it (and observed magnitudes) can vary with altitude and atmospheric conditions. However, a large number of measurements have been made in this system, including many of the bright stars.".
- UBV_photometric_system wikiPageID "5731588".
- UBV_photometric_system wikiPageLength "3300".
- UBV_photometric_system wikiPageOutDegree "21".
- UBV_photometric_system wikiPageRevisionID "698485961".
- UBV_photometric_system wikiPageWikiLink A-type_main-sequence_star.
- UBV_photometric_system wikiPageWikiLink Alan_William_James_Cousins.
- UBV_photometric_system wikiPageWikiLink Astronomer.
- UBV_photometric_system wikiPageWikiLink Category:American_inventions.
- UBV_photometric_system wikiPageWikiLink Category:Photometric_systems.
- UBV_photometric_system wikiPageWikiLink Category:Stellar_physics.
- UBV_photometric_system wikiPageWikiLink Color_index.
- UBV_photometric_system wikiPageWikiLink Extinction_(astronomy).
- UBV_photometric_system wikiPageWikiLink Harold_Johnson_(astronomer).
- UBV_photometric_system wikiPageWikiLink McDonald_Observatory.
- UBV_photometric_system wikiPageWikiLink Otto_Struve_Telescope.
- UBV_photometric_system wikiPageWikiLink Photometric_system.
- UBV_photometric_system wikiPageWikiLink Stellar_classification.
- UBV_photometric_system wikiPageWikiLink Ultraviolet.
- UBV_photometric_system wikiPageWikiLink United_States.
- UBV_photometric_system wikiPageWikiLink William_Wilson_Morgan.
- UBV_photometric_system wikiPageWikiLinkText "B and V".
- UBV_photometric_system wikiPageWikiLinkText "B, V".
- UBV_photometric_system wikiPageWikiLinkText "B0".
- UBV_photometric_system wikiPageWikiLinkText "BVR Johnson system".
- UBV_photometric_system wikiPageWikiLinkText "Johnson ''UBV'' colours".
- UBV_photometric_system wikiPageWikiLinkText "Johnson UBV system".
- UBV_photometric_system wikiPageWikiLinkText "Johnson V".
- UBV_photometric_system wikiPageWikiLinkText "Johnson".
- UBV_photometric_system wikiPageWikiLinkText "Johnson-Cousins V-band".
- UBV_photometric_system wikiPageWikiLinkText "UBV photometric system".
- UBV_photometric_system wikiPageWikiLinkText "UBV photometry".
- UBV_photometric_system wikiPageWikiLinkText "UBV system".
- UBV_photometric_system wikiPageWikiLinkText "UBV".
- UBV_photometric_system wikiPageWikiLinkText "UBVRI and Cousins".
- UBV_photometric_system wikiPageWikiLinkText "V band".
- UBV_photometric_system wikiPageWikiLinkText "V".
- UBV_photometric_system wikiPageWikiLinkText "V-band".
- UBV_photometric_system wikiPageWikiLinkText "blue and visual".
- UBV_photometric_system wikiPageWikiLinkText "color magnitudes".
- UBV_photometric_system wikiPageWikiLinkText "specific filter".
- UBV_photometric_system wikiPageWikiLinkText "ubvy standard star".
- UBV_photometric_system wikiPageWikiLinkText "visual magnitude".
- UBV_photometric_system wikiPageWikiLinkText "visual".
- UBV_photometric_system wikiPageUsesTemplate Template:Astronomy-stub.
- UBV_photometric_system wikiPageUsesTemplate Template:Portal.
- UBV_photometric_system wikiPageUsesTemplate Template:Reflist.
- UBV_photometric_system wikiPageUsesTemplate Template:Star.
- UBV_photometric_system subject Category:American_inventions.
- UBV_photometric_system subject Category:Photometric_systems.
- UBV_photometric_system subject Category:Stellar_physics.
- UBV_photometric_system hypernym System.
- UBV_photometric_system comment "The UBV photometric system, also called the Johnson system (or Johnson-Morgan system), is a wide band photometric system for classifying stars according to their colors. It is the first known standardized photoelectric photometric system. The letters U, B, and V stand for ultraviolet, blue, and visual magnitudes, which are measured for a star in order to classify it in the UBV system.".
- UBV_photometric_system label "UBV photometric system".
- UBV_photometric_system sameAs Q129833.
- UBV_photometric_system sameAs Sistema_fotomètric_UBV.
- UBV_photometric_system sameAs UBV_systém.
- UBV_photometric_system sameAs UBV-System.
- UBV_photometric_system sameAs Sistema_fotométrico_UBV.
- UBV_photometric_system sameAs Système_photométrique_UBV.
- UBV_photometric_system sameAs Sistema_fotometrico_UBV.
- UBV_photometric_system sameAs ジョンソンのUBVシステム.
- UBV_photometric_system sameAs UBV_색.
- UBV_photometric_system sameAs UBV-System.
- UBV_photometric_system sameAs UBV_fotometrinė_sistema.
- UBV_photometric_system sameAs Sistem_fotometrik_UBV.
- UBV_photometric_system sameAs Sistema_fotométrico_UBV.
- UBV_photometric_system sameAs m.0f1r0n.
- UBV_photometric_system sameAs Sistem_fotometric_UBV.
- UBV_photometric_system sameAs Фотометрическая_система_UBV.
- UBV_photometric_system sameAs UBV_systém.
- UBV_photometric_system sameAs Система_UBV.
- UBV_photometric_system sameAs Q129833.
- UBV_photometric_system sameAs UBV测光系统.
- UBV_photometric_system wasDerivedFrom UBV_photometric_system?oldid=698485961.
- UBV_photometric_system isPrimaryTopicOf UBV_photometric_system.