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Statements

Subject Item
dbr:HD_91312
rdf:type
dbo:Location yago:PhysicalEntity100001930 dbo:Place dbo:Star dbo:CelestialBody schema:Place yago:Object100002684 yago:WikicatHenryDraperCatalogueObjects owl:Thing
rdfs:label
HD 91312 HD 91312 HD 91312
rdfs:comment
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″。 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. 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.
dcterms:subject
dbc:Ursa_Major_(constellation) dbc:Circumstellar_disks dbc:Henry_Draper_Catalogue_objects dbc:A-type_subgiants dbc:Hipparcos_objects dbc:Bright_Star_Catalogue_objects dbc:Durchmusterung_objects dbc:Triple_stars
dbo:wikiPageID
38663023
dbo:wikiPageRevisionID
1079516353
dbo:wikiPageWikiLink
dbc:Ursa_Major_(constellation) dbr:Frederick_de_Houtman dbr:As-Sufi dbr:Flamsteed dbr:Apparent_visual_magnitude dbr:Million_years dbr:Angular_separation dbr:Caroline_Herschel dbr:Ursa_Major dbr:Circumpolar_constellation dbr:Radial_velocity dbr:Julius_Schiller dbr:Star_system dbc:Circumstellar_disks dbr:Tycho_Brahe dbr:Hevelius dbc:Henry_Draper_Catalogue_objects dbr:Edmond_Halley dbc:A-type_subgiants dbr:Infrared_excess dbr:Johann_Bayer dbr:Circumstellar_disk dbc:Durchmusterung_objects dbr:Stellar_parallax dbc:Bright_Star_Catalogue_objects dbr:Latin_letters dbr:John_Herschel dbc:Hipparcos_objects dbr:Johann_Elert_Bode dbr:Northern_celestial_hemisphere dbr:Light-year dbr:Kepler dbr:Greek_letters dbr:Al-Biruni dbc:Triple_stars dbr:Projected_separation dbr:Red_dwarf dbr:Sun dbr:Ursa_Major_(constellation) dbr:Ulugh_Beg dbr:Ptolemy dbr:Clavius dbr:Visual_binary dbr:Copernicus
owl:sameAs
yago-res:HD_91312 freebase:m.0r8l9wv wikidata:Q5629381 n18:4kb4H dbpedia-sv:HD_91312 dbpedia-zh:HD_91312
dbp:wikiPageUsesTemplate
dbt:Odlist dbt:Stars_of_Ursa_Major dbt:Short_description dbt:Starbox_reference dbt:Starbox_orbit dbt:Starbox_observe dbt:Starbox_detail dbt:RA dbt:Starbox_end dbt:Starbox_catalogue dbt:Starbox_character dbt:Starbox_begin dbt:Starbox_astrometry dbt:Val dbt:DEC dbt:Reflist
dbp:absmagV
2.02
dbp:ageMyr
~200
dbp:appmagV
4.72
dbp:class
A7IV-V + M
dbp:component
B A
dbp:constell
dbr:Ursa_Major
dbp:eccentricity
0.3
dbp:epoch
J2000
dbp:gravity
4
dbp:k
14.5
dbp:mass
1.83
dbp:pError
0.2283
dbp:parallax
29.8168
dbp:periarg
311
dbp:periodUnitless
2.5277184E7
dbp:propMoDec
3.172
dbp:propMoRa
−138.103
dbp:rotationalVelocity
119
dbo:abstract
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. 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". 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″。
gold:hypernym
dbr:Star
prov:wasDerivedFrom
wikipedia-en:HD_91312?oldid=1079516353&ns=0
dbo:wikiPageLength
10468
foaf:isPrimaryTopicOf
wikipedia-en:HD_91312