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- 12_Ophiuchi abstract "12 Ophiuchi is a variable star in the constellation Ophiuchus. No companions have yet been detected in orbit around this star, and it remains uncertain whether or not it possesses a dust ring.This star is categorized as a BY Draconis variable, with variable star designation V2133. The variability is attributed to large-scale magnetic activity on the chromosphere (in the form of starspots) combined with a rotational period that moved the active regions into (and out of) the line of sight. This results in low amplitude variability of 12 Ophiuchi's luminosity. The star also appears to display rapid variation in luminosity, possibly due to changes in the starspots. Measurements of the long-term variability show two overlapping cycles of starspot activity (compared to the Sun's single, 11-year cycle.) The periods of these two cycles are 4.0 and 17.4 years.This star is among the top 100 target stars for NASA's planned Terrestrial Planet Finder mission [1]. However, the mission is now postponed indefinitely.Its abundance of heavy elements (elements heavier than helium) is nearly identical to that of the Sun. The surface gravity is equal to , which is somewhat higher than the Sun's. The space velocity is 30 km/s relative to the solar system. The high rotation period and active chromosphere are indicative of a relatively young star.".
- 12_Ophiuchi wikiPageExternalLink 12ophiu.htm.
- 12_Ophiuchi wikiPageID "8265280".
- 12_Ophiuchi wikiPageRevisionID "601556983".
- 12_Ophiuchi ageGyr "1".
- 12_Ophiuchi appmagV "5.77".
- 12_Ophiuchi aricns "1317".
- 12_Ophiuchi bV "+.82".
- 12_Ophiuchi class "K2 V".
- 12_Ophiuchi constell Ophiuchus.
- 12_Ophiuchi epoch "J2000".
- 12_Ophiuchi hasPhotoCollection 12_Ophiuchi.
- 12_Ophiuchi luminosity "0.39".
- 12_Ophiuchi luminosityBolometric "0.45".
- 12_Ophiuchi mass "0.91".
- 12_Ophiuchi metal "102".
- 12_Ophiuchi pError "0.4".
- 12_Ophiuchi parallax "102.55".
- 12_Ophiuchi propMoDec "–309.63".
- 12_Ophiuchi propMoRa "+456.04".
- 12_Ophiuchi radialV "–15.4".
- 12_Ophiuchi rotation "1840320.0".
- 12_Ophiuchi simbad "HD+149661".
- 12_Ophiuchi temperature "5300".
- 12_Ophiuchi uB "+0.50".
- 12_Ophiuchi variable BY_Draconis_variable.
- 12_Ophiuchi subject Category:BY_Draconis_variables.
- 12_Ophiuchi subject Category:Flamsteed_objects.
- 12_Ophiuchi subject Category:Gliese_and_GJ_objects.
- 12_Ophiuchi subject Category:HR_objects.
- 12_Ophiuchi subject Category:Henry_Draper_Catalogue_objects.
- 12_Ophiuchi subject Category:Hipparcos_objects.
- 12_Ophiuchi subject Category:K-type_main-sequence_stars.
- 12_Ophiuchi subject Category:Objects_named_with_variable_star_designations.
- 12_Ophiuchi subject Category:Objects_within_100_ly_of_Earth.
- 12_Ophiuchi subject Category:Ophiuchus_(constellation).
- 12_Ophiuchi subject Category:Solar-type_stars.
- 12_Ophiuchi type CelestialBody.
- 12_Ophiuchi type Star.
- 12_Ophiuchi type PhysicalBody.
- 12_Ophiuchi comment "12 Ophiuchi is a variable star in the constellation Ophiuchus. No companions have yet been detected in orbit around this star, and it remains uncertain whether or not it possesses a dust ring.This star is categorized as a BY Draconis variable, with variable star designation V2133. The variability is attributed to large-scale magnetic activity on the chromosphere (in the form of starspots) combined with a rotational period that moved the active regions into (and out of) the line of sight.".
- 12_Ophiuchi label "12 Ophiuchi".
- 12_Ophiuchi label "12 Ophiuchi".
- 12_Ophiuchi label "12 Ophiuchi".
- 12_Ophiuchi label "12 Ophiuchi".
- 12_Ophiuchi label "12 Ophiuchi".
- 12_Ophiuchi label "12 Змееносца".
- 12_Ophiuchi label "列肆增四".
- 12_Ophiuchi sameAs 12_Ophiuchi.
- 12_Ophiuchi sameAs 12_Ophiuchi.
- 12_Ophiuchi sameAs 12_Ophiuchi.
- 12_Ophiuchi sameAs 뱀주인자리_12.
- 12_Ophiuchi sameAs 12_Ophiuchi.
- 12_Ophiuchi sameAs m.026y9zr.
- 12_Ophiuchi sameAs Q115904.
- 12_Ophiuchi sameAs Q115904.
- 12_Ophiuchi wasDerivedFrom 12_Ophiuchi?oldid=601556983.
- 12_Ophiuchi isPrimaryTopicOf 12_Ophiuchi.
- 12_Ophiuchi name "12 Ophiuchi".