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- Iota_Ursae_Majoris abstract "Iota Ursae Majoris (Iota UMa, ι Ursae Majoris, ι UMa) is a star system in the northern circumpolar constellation of Ursa Major. It has an apparent visual magnitude of 3.14, making it visible to the naked eye and placing it among the brighter members of this constellation. Based upon parallax measurements, it is located at a distance of 47.3 light-years (14.5 parsecs) from Earth. It has the traditional names Talitha, Talitha Borealis and Alphikra Borealis, and was also dubbed Dnoces ("Second," backwards) after Edward H. White II, an Apollo 1 astronaut. The name was invented by his fellow astronaut Gus Grissom as a practical joke.The Iota Ursae Majoris system is composed of two binary stars. The brightest component is a white A-type subgiant. It is a spectroscopic binary whose components have an orbital period of 4028 days. The companion binary is composed of the 9th magnitude and 10th magnitude stars. These two stars orbit around each other with a period of 39.7 years, and are separated by roughly 0.7 arcseconds, or at least 10 AU. This pair may be the source of the X-ray emission detected from this system.The two binary systems orbit around each other once every 818 years. The apparent separation between the two binaries is rapidly decreasing as they follow their orbits. In 1841 when the B component was first discovered, they had a separation of 10.7 arcseconds, or at least 156 AU. By 1971 their separation had decreased to 4.5 arcseconds, or at least 66 AU. This system appears to be dynamically unstable with a high likelihood and may become disrupted on a time scale on the order of 105 years.".
- Iota_Ursae_Majoris thumbnail Ursa_Major_IAU.svg?width=300.
- Iota_Ursae_Majoris wikiPageExternalLink 4c00680.htm.
- Iota_Ursae_Majoris wikiPageExternalLink talitha.html.
- Iota_Ursae_Majoris wikiPageExternalLink star_names_030829.html.
- Iota_Ursae_Majoris wikiPageID "2710431".
- Iota_Ursae_Majoris wikiPageRevisionID "601984079".
- Iota_Ursae_Majoris ageMyr "620".
- Iota_Ursae_Majoris appmagV "3.14".
- Iota_Ursae_Majoris bV "+0.19".
- Iota_Ursae_Majoris class "A7 IV + dM1 J".
- Iota_Ursae_Majoris component "ι UMa A".
- Iota_Ursae_Majoris constell Ursa_Major.
- Iota_Ursae_Majoris epoch "J2000".
- Iota_Ursae_Majoris hasPhotoCollection Iota_Ursae_Majoris.
- Iota_Ursae_Majoris pError "0.16".
- Iota_Ursae_Majoris parallax "68.92".
- Iota_Ursae_Majoris propMoDec "-215.32".
- Iota_Ursae_Majoris propMoRa "-441.29".
- Iota_Ursae_Majoris radialV "+9.0".
- Iota_Ursae_Majoris rotationalVelocity "154".
- Iota_Ursae_Majoris uB "+0.08".
- Iota_Ursae_Majoris variable "Suspected".
- Iota_Ursae_Majoris subject Category:A-type_subgiants.
- Iota_Ursae_Majoris subject Category:Bayer_objects.
- Iota_Ursae_Majoris subject Category:Multiple_star_systems.
- Iota_Ursae_Majoris subject Category:Objects_within_100_ly_of_Earth.
- Iota_Ursae_Majoris subject Category:Spectroscopic_binaries.
- Iota_Ursae_Majoris subject Category:Stars_with_proper_names.
- Iota_Ursae_Majoris subject Category:Ursa_Major_(constellation).
- Iota_Ursae_Majoris type BayerObjects.
- Iota_Ursae_Majoris type BinaryStar109221070.
- Iota_Ursae_Majoris type CelestialBody109239740.
- Iota_Ursae_Majoris type NaturalObject100019128.
- Iota_Ursae_Majoris type Object100002684.
- Iota_Ursae_Majoris type PhysicalEntity100001930.
- Iota_Ursae_Majoris type SpectroscopicBinaries.
- Iota_Ursae_Majoris type Star109444100.
- Iota_Ursae_Majoris type StarsWithProperNames.
- Iota_Ursae_Majoris type Whole100003553.
- Iota_Ursae_Majoris type CelestialBody.
- Iota_Ursae_Majoris type Star.
- Iota_Ursae_Majoris type PhysicalBody.
- Iota_Ursae_Majoris comment "Iota Ursae Majoris (Iota UMa, ι Ursae Majoris, ι UMa) is a star system in the northern circumpolar constellation of Ursa Major. It has an apparent visual magnitude of 3.14, making it visible to the naked eye and placing it among the brighter members of this constellation. Based upon parallax measurements, it is located at a distance of 47.3 light-years (14.5 parsecs) from Earth.".
- Iota_Ursae_Majoris label "Iota Ursae Majoris".
- Iota_Ursae_Majoris label "Iota Ursae Majoris".
- Iota_Ursae_Majoris label "Iota Ursae Majoris".
- Iota_Ursae_Majoris label "Iota Ursae Majoris".
- Iota_Ursae_Majoris label "Jota Ursae Majoris".
- Iota_Ursae_Majoris label "Talitha (ster)".
- Iota_Ursae_Majoris label "Talitha Borealis".
- Iota_Ursae_Majoris label "Talitha Borealis".
- Iota_Ursae_Majoris label "Талита Северная".
- Iota_Ursae_Majoris label "القفزة الثالث الشمالي".
- Iota_Ursae_Majoris label "大熊座ι".
- Iota_Ursae_Majoris sameAs Iota_Ursae_Majoris.
- Iota_Ursae_Majoris sameAs Talitha_Borealis.
- Iota_Ursae_Majoris sameAs Iota_Ursae_Majoris.
- Iota_Ursae_Majoris sameAs Talitha_Borealis.
- Iota_Ursae_Majoris sameAs Talitha_(ster).
- Iota_Ursae_Majoris sameAs Jota_Ursae_Majoris.
- Iota_Ursae_Majoris sameAs Iota_Ursae_Majoris.
- Iota_Ursae_Majoris sameAs m.07zfrh.
- Iota_Ursae_Majoris sameAs Q1501930.
- Iota_Ursae_Majoris sameAs Q1501930.
- Iota_Ursae_Majoris sameAs Iota_Ursae_Majoris.
- Iota_Ursae_Majoris wasDerivedFrom Iota_Ursae_Majoris?oldid=601984079.
- Iota_Ursae_Majoris depiction Ursa_Major_IAU.svg.
- Iota_Ursae_Majoris isPrimaryTopicOf Iota_Ursae_Majoris.
- Iota_Ursae_Majoris name "Iota Ursae Majoris".