HD 171978 (original) (raw)
HD 171978 (e Serpentis) é uma estrela na direção da Serpens. Possui uma ascensão reta de 18h 37m 35.95s e uma declinação de −00° 18′ 33.9″. Sua magnitude aparente é igual a 5.76. Considerando sua distância de 644 anos-luz em relação à Terra, sua magnitude absoluta é igual a −0.72. Pertence à classe espectral A2V.
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| dbo:abstract | HD 171978 is a binary star system in the Serpens Cauda segment of the equatorial constellation of Serpens. It may be referred to by its Bright Star Catalogue identifier of HR 6993. This system is dimly visible to the naked eye with a combined apparent visual magnitude of 5.76, although is a suspected variable star of unknown type with a magnitude that has been reported to vary between 5.74 and 5.86. HD 171978 is located at a distance of approximately 537 light-years from the Sun based on parallax, and is drifting further away with a barycentric radial velocity of +11.4 km/s. It is a member of the Ursa Major Moving Group. The binary nature of this system was reported by Canadian astronomer R. M. Petrie in 1948. It is a double-lined spectroscopic binary with an orbital period of 14.7 days and an eccentricity (ovalness) of 0.25. The orbital inclination is estimated to be ~30°. The two stars have a magnitude difference of 0.4±0.1 mag, which gives respective magnitudes of 6.33 and 6.73. They each show a sharp-lined spectra, indicating their rotation rates are not high. Both are similar A-type main-sequence stars with a combined stellar classification of A0V. In 1970, Geary and Abt noted that the secondary appeared to be an Am star. (en) HD 171978 (e Serpentis) é uma estrela na direção da Serpens. Possui uma ascensão reta de 18h 37m 35.95s e uma declinação de −00° 18′ 33.9″. Sua magnitude aparente é igual a 5.76. Considerando sua distância de 644 anos-luz em relação à Terra, sua magnitude absoluta é igual a −0.72. Pertence à classe espectral A2V. (pt) HD 171978 är en dubbelstjärna belägen i den södra delen av stjärnbilden Ormen, som också har Bayer-beteckningen e Serpentis. Den har en kombinerad skenbar magnitud av ca 5,76 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 6,1 mas, beräknas den befinna sig på ett avstånd på ca 537 ljusår (ca 165 parsek) från solen och ingår i rörelsegruppen Ursa Major. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 11 km/s. (sv) HD171978 — хімічно пекулярна зоря спектрального класуA1 й має видиму зоряну величину в смузі V приблизно 5,8.Вона розташована на відстані близько 644,6 світлових років від Сонця. (uk) HD 171978，又名BD-00 3521，SAO 142444、HR 6993，是一颗恒星，视星等为5.75，位于銀經31.08，銀緯2.94，其B1900.0坐标为赤經18h 32m 27.6s，赤緯-0° 2.94′ 37″。 (zh) |
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| dbp:appmagV | 5.740000 (xsd:double) (en) |
| dbp:class | A0V (en) |
| dbp:component | A (en) B (en) |
| dbp:constell | dbr:Serpens_(constellation) |
| dbp:epoch | J2000.0 (en) |
| dbp:equinox | J2000.0 (en) |
| dbp:mass | 2.350000 (xsd:double) 2.500000 (xsd:double) |
| dbp:pError | 0.083300 (xsd:double) |
| dbp:parallax | 6.077400 (xsd:double) |
| dbp:propMoDec | −20.710 (en) |
| dbp:propMoRa | +14.018 (en) |
| dbp:rI | +0.04 (en) |
| dbp:uB | +0.06 (en) |
| dbp:variable | suspected (en) |
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| rdfs:comment | HD 171978 (e Serpentis) é uma estrela na direção da Serpens. Possui uma ascensão reta de 18h 37m 35.95s e uma declinação de −00° 18′ 33.9″. Sua magnitude aparente é igual a 5.76. Considerando sua distância de 644 anos-luz em relação à Terra, sua magnitude absoluta é igual a −0.72. Pertence à classe espectral A2V. (pt) HD 171978 är en dubbelstjärna belägen i den södra delen av stjärnbilden Ormen, som också har Bayer-beteckningen e Serpentis. Den har en kombinerad skenbar magnitud av ca 5,76 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 6,1 mas, beräknas den befinna sig på ett avstånd på ca 537 ljusår (ca 165 parsek) från solen och ingår i rörelsegruppen Ursa Major. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 11 km/s. (sv) HD171978 — хімічно пекулярна зоря спектрального класуA1 й має видиму зоряну величину в смузі V приблизно 5,8.Вона розташована на відстані близько 644,6 світлових років від Сонця. (uk) HD 171978，又名BD-00 3521，SAO 142444、HR 6993，是一颗恒星，视星等为5.75，位于銀經31.08，銀緯2.94，其B1900.0坐标为赤經18h 32m 27.6s，赤緯-0° 2.94′ 37″。 (zh) HD 171978 is a binary star system in the Serpens Cauda segment of the equatorial constellation of Serpens. It may be referred to by its Bright Star Catalogue identifier of HR 6993. This system is dimly visible to the naked eye with a combined apparent visual magnitude of 5.76, although is a suspected variable star of unknown type with a magnitude that has been reported to vary between 5.74 and 5.86. HD 171978 is located at a distance of approximately 537 light-years from the Sun based on parallax, and is drifting further away with a barycentric radial velocity of +11.4 km/s. It is a member of the Ursa Major Moving Group. (en) |
| rdfs:label | HD 171978 (en) HD 171978 (pt) HD 171978 (sv) HD 171978 (zh) HD171978 (uk) |
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