HD 91312 (original) (raw)
HD 91312 är en trippelstjärna belägen i den mellersta delen av stjärnbilden Stora björnen. Den har en kombinerad skenbar magnitud av ca 4,72 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 29,8 mas, beräknas den befinna sig på ett avstånd på ca 109 ljusår (ca 34 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 9 km/s.
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|---|---|
| dbo:abstract | HD 91312 is a multiple star system in the northern circumpolar constellation Ursa Major. Faintly visible to the naked eye, it is the brightest star of Ursa Major without Flamsteed designation with a combined apparent visual magnitude of 4.72. The system is located at a distance of 109 light-years from the Sun based on parallax. The radial velocity is poorly constrained, but it appears to be drifting further away at a rate of ~9 km/s. This was identified as a visual binary by John Herschel in 1831. The pair have an angular separation of 23″, equivalent to a linear projected separation of ~796 AU. Variations in the radial velocity as well as direct imaging, indicate the presence of a low-mass stellar companion. This companion is an early-to-mid red dwarf, and orbits the primary on an edge-on orbit with a semi-major axis of 9.7 au. This is a young system with an age of around 200 million years. It display an infrared excess from a circumstellar disk of dusty debris. It has a mean temperature of 35 K and is orbiting 218.1 AU from the inner pair. This star is relatively bright, but it was rarely included in old catalogues. Catalogues and atlases it was not included in are, for example, those by Ptolemy and all its derivatives and translations (by as-Sufi, al-Biruni, Ulugh Beg, Copernicus, Clavius, etc.), Tycho Brahe, de Houtman, Bayer, Kepler, Schiller, Halley, Flamsteed (as well as published by Carolina Herschel in 1798 catalogue of stars, observed by Flamsteed, but not inserted in his British Catalogue) and Bradley. Catalogues and atlases it was included in are those by Hevelius (1690) (65th in Ursa Major, designated In Ungula sinistri Pedis poster. trium sequens) and Bode (1801) (number 157 of Ursa Major). Bode used extended Bayer designations for some stars, and HD 91312 also was assigned designation "w", whereas original Bayer designations for Ursa Major stars are all Greek letters and Latin letters from "A" to "h". (en) HD 91312 är en trippelstjärna belägen i den mellersta delen av stjärnbilden Stora björnen. Den har en kombinerad skenbar magnitud av ca 4,72 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 29,8 mas, beräknas den befinna sig på ett avstånd på ca 109 ljusår (ca 34 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 9 km/s. (sv) HD 91312，又名BD+41 2101，SAO 43379、HR 4132，是一颗恒星，视星等为4.75，位于銀經178.93，銀緯58.62，其B1900.0坐标为赤經10h 27m 23.9s，赤緯+40° 58.62′ 25″。 (zh) |
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| dbo:wikiPageWikiLink | dbr:Caroline_Herschel dbr:Ptolemy dbr:Million_years dbr:Ursa_Major dbr:Infrared_excess dbc:A-type_subgiants dbc:Bright_Star_Catalogue_objects dbc:Circumstellar_disks dbc:Durchmusterung_objects dbc:Henry_Draper_Catalogue_objects dbc:Hipparcos_objects dbc:Triple_stars dbc:Ursa_Major_(constellation) dbr:Copernicus dbr:Clavius dbr:Frederick_de_Houtman dbr:Light-year dbr:Star_system dbr:Stellar_parallax dbr:Tycho_Brahe dbr:Circumstellar_disk dbr:Julius_Schiller dbr:Al-Biruni dbr:Edmond_Halley dbr:Flamsteed dbr:Angular_separation dbr:Johann_Bayer dbr:Johann_Elert_Bode dbr:John_Herschel dbr:Kepler dbr:Latin_letters dbr:Sun dbr:Red_dwarf dbr:Circumpolar_constellation dbr:Apparent_visual_magnitude dbr:Greek_letters dbr:Radial_velocity dbr:Northern_celestial_hemisphere dbr:Visual_binary dbr:Ulugh_Beg dbr:Ursa_Major_(constellation) dbr:As-Sufi dbr:Hevelius dbr:Projected_separation |
| dbp:absmagV | 2.020000 (xsd:double) |
| dbp:ageMyr | ~200 (en) |
| dbp:appmagV | 4.720000 (xsd:double) (en) |
| dbp:class | A7IV-V + M (en) |
| dbp:component | A (en) B (en) |
| dbp:constell | dbr:Ursa_Major |
| dbp:eccentricity | 0.300000 (xsd:double) |
| dbp:epoch | J2000 (en) |
| dbp:gravity | 4 (xsd:integer) |
| dbp:k | 14.500000 (xsd:double) |
| dbp:mass | 1.830000 (xsd:double) |
| dbp:pError | 0.228300 (xsd:double) |
| dbp:parallax | 29.816800 (xsd:double) |
| dbp:periarg | 311 (xsd:integer) |
| dbp:periodUnitless | 2.5277184E7 (dbd:second) |
| dbp:propMoDec | 3.172000 (xsd:double) |
| dbp:propMoRa | −138.103 (en) |
| dbp:rotationalVelocity | 119 (xsd:integer) |
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| gold:hypernym | dbr:Star |
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| rdfs:comment | HD 91312 är en trippelstjärna belägen i den mellersta delen av stjärnbilden Stora björnen. Den har en kombinerad skenbar magnitud av ca 4,72 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 29,8 mas, beräknas den befinna sig på ett avstånd på ca 109 ljusår (ca 34 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 9 km/s. (sv) HD 91312，又名BD+41 2101，SAO 43379、HR 4132，是一颗恒星，视星等为4.75，位于銀經178.93，銀緯58.62，其B1900.0坐标为赤經10h 27m 23.9s，赤緯+40° 58.62′ 25″。 (zh) HD 91312 is a multiple star system in the northern circumpolar constellation Ursa Major. Faintly visible to the naked eye, it is the brightest star of Ursa Major without Flamsteed designation with a combined apparent visual magnitude of 4.72. The system is located at a distance of 109 light-years from the Sun based on parallax. The radial velocity is poorly constrained, but it appears to be drifting further away at a rate of ~9 km/s. (en) |
| rdfs:label | HD 91312 (en) HD 91312 (sv) HD 91312 (zh) |
| owl:sameAs | freebase:HD 91312 yago-res:HD 91312 wikidata:HD 91312 dbpedia-sv:HD 91312 dbpedia-zh:HD 91312 https://global.dbpedia.org/id/4kb4H |
| prov:wasDerivedFrom | wikipedia-en:HD_91312?oldid=1079516353&ns=0 |
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