HD 42818 (original) (raw)
HD 42818 (L Camelopardalis) é uma estrela na direção da Camelopardalis. Possui uma ascensão reta de 06h 18m 50.78s e uma declinação de +69° 19′ 12.1″. Sua magnitude aparente é igual a 4.76. Considerando sua distância de 176 anos-luz em relação à Terra, sua magnitude absoluta é igual a 1.10. Pertence à classe espectral A0Vn.
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| dbo:abstract | HD 42818 is a suspected astrometric binary star system in the northern circumpolar constellation of Camelopardalis. It is visible to the naked eye with an apparent visual magnitude of +4.76. Based upon an annual parallax shift of 18.64±0.23 mas as seen from Earth's orbit, it is located some 175 light years away. The system appears to be moving closer with a heliocentric radial velocity of −7 km/s. As of 2012, it is estimated that the system will make its closest approach to the Sun in 485,000 years at a distance of around 169.2 ly (51.87 pc). The visible member, designated component A, is an A-type main-sequence star with a stellar classification of A0 Vn, where the 'n' indicates "nebulous" absorption lines due to rotation. It is spinning rapidly with a projected rotational velocity of 255 km/s (van Belle (2012) lists 325 km/s), giving the star a pronounced equatorial bulge. Although spectral type A stars are not expected to emit X-rays, the coordinates of this star is a source of X-ray emission with a luminosity of 120.4×1020 W. This may be coming from a cooler, unseen companion. The primary has an estimated 2.49 times the mass of the Sun and about 2.7 times the Sun's radius. It is a relatively young star, about 99 million years old. The star is radiating 34 times the Sun's luminosity from its photosphere at an effective temperature of 10,834 K. (en) HD 42818 (L Camelopardalis) é uma estrela na direção da Camelopardalis. Possui uma ascensão reta de 06h 18m 50.78s e uma declinação de +69° 19′ 12.1″. Sua magnitude aparente é igual a 4.76. Considerando sua distância de 176 anos-luz em relação à Terra, sua magnitude absoluta é igual a 1.10. Pertence à classe espectral A0Vn. (pt) HIP 29997 (L Жирафа) — звезда в созвездии Жирафа. Находится на расстоянии 175 световых лет (54,5 парсек) от Земли. (ru) HD 42818 är en vit stjärna i huvudserien i stjärnbilden Giraffen. HD 42818 har en visuell magnitud på +4,76 och ligger på ungefär 176 ljusårs avstånd. (sv) HD 42818，又名BD+69 371，SAO 13788、HR 2209，是一颗恒星，视星等为4.8，位于銀經145.16，銀緯22.46，其B1900.0坐标为赤經6h 7m 49.6s，赤緯+69° 22.46′ 19″。 (zh) |
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| dbp:absmagV | +1.11 (en) |
| dbp:ageMyr | 99 (xsd:integer) |
| dbp:appmagV | +4.76 (en) |
| dbp:class | A0 Vn (en) |
| dbp:component | HD 42818 A (en) |
| dbp:constell | dbr:Camelopardalis_(constellation) |
| dbp:epoch | J2000 (en) |
| dbp:luminosity | 33.830000 (xsd:double) |
| dbp:mass | 2.490000 (xsd:double) |
| dbp:metalFe | 0.300000 (xsd:double) |
| dbp:pError | 0.230000 (xsd:double) |
| dbp:parallax | 18.640000 (xsd:double) |
| dbp:propMoDec | −108.270 (en) |
| dbp:propMoRa | +0.686 (en) |
| dbp:radius | 2.700000 (xsd:double) |
| dbp:rotationalVelocity | 255 (xsd:integer) |
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| dcterms:subject | dbc:A-type_main-sequence_stars dbc:Astrometric_binaries dbc:Bright_Star_Catalogue_objects dbc:Camelopardalis_(constellation) dbc:Durchmusterung_objects dbc:Henry_Draper_Catalogue_objects dbc:Hipparcos_objects |
| gold:hypernym | dbr:Star |
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| rdfs:comment | HD 42818 (L Camelopardalis) é uma estrela na direção da Camelopardalis. Possui uma ascensão reta de 06h 18m 50.78s e uma declinação de +69° 19′ 12.1″. Sua magnitude aparente é igual a 4.76. Considerando sua distância de 176 anos-luz em relação à Terra, sua magnitude absoluta é igual a 1.10. Pertence à classe espectral A0Vn. (pt) HIP 29997 (L Жирафа) — звезда в созвездии Жирафа. Находится на расстоянии 175 световых лет (54,5 парсек) от Земли. (ru) HD 42818 är en vit stjärna i huvudserien i stjärnbilden Giraffen. HD 42818 har en visuell magnitud på +4,76 och ligger på ungefär 176 ljusårs avstånd. (sv) HD 42818，又名BD+69 371，SAO 13788、HR 2209，是一颗恒星，视星等为4.8，位于銀經145.16，銀緯22.46，其B1900.0坐标为赤經6h 7m 49.6s，赤緯+69° 22.46′ 19″。 (zh) HD 42818 is a suspected astrometric binary star system in the northern circumpolar constellation of Camelopardalis. It is visible to the naked eye with an apparent visual magnitude of +4.76. Based upon an annual parallax shift of 18.64±0.23 mas as seen from Earth's orbit, it is located some 175 light years away. The system appears to be moving closer with a heliocentric radial velocity of −7 km/s. As of 2012, it is estimated that the system will make its closest approach to the Sun in 485,000 years at a distance of around 169.2 ly (51.87 pc). (en) |
| rdfs:label | HD 42818 (en) HD 42818 (pt) HIP 29997 (ru) HD 42818 (sv) HD 42818 (zh) |
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| prov:wasDerivedFrom | wikipedia-en:HD_42818?oldid=1120698028&ns=0 |
| foaf:isPrimaryTopicOf | wikipedia-en:HD_42818 |
| foaf:name | HD 42818 (en) |
| is dbo:wikiPageRedirects of | dbr:HIP_29997 |
| is dbo:wikiPageWikiLink of | dbr:Table_of_stars_with_Bayer_designations dbr:HIP_29997 dbr:List_of_stars_in_Camelopardalis |
| is foaf:primaryTopic of | wikipedia-en:HD_42818 |