XX Trianguli (original) (raw)
XX du Triangle XX Trianguli Autres désignations XX Tri, BD+34°363, GJ 3130, HD 12545, HIP 9630, SAO 55233 XX Trianguli (en abrégé XX Tri, en français XX du Triangle) est une étoile géante rouge variable de la constellation du Triangle à la surface de laquelle une grande tache a été observée et suivie par , ce qui a permis de modéliser son évolution au cours du temps. Elle est distante d'environ 197 pc (∼643 a.l.) de la Terre.
| Property | Value |
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| dbo:abstract | XX du Triangle XX Trianguli Autres désignations XX Tri, BD+34°363, GJ 3130, HD 12545, HIP 9630, SAO 55233 XX Trianguli (en abrégé XX Tri, en français XX du Triangle) est une étoile géante rouge variable de la constellation du Triangle à la surface de laquelle une grande tache a été observée et suivie par , ce qui a permis de modéliser son évolution au cours du temps. Elle est distante d'environ 197 pc (∼643 a.l.) de la Terre. (fr) XX Trianguli, abbreviated XX Tri, is a variable star in the northern constellation of Triangulum, about 1.5° to the WNW of Beta Trianguli along the constellation border with Andromeda. It is classified as a RS Canum Venaticorum variable and ranges in brightness from magnitude 8.1 down to 8.7, which is too faint to be visible to the naked eye. The system is located at a distance of approximately 642 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −26 km/s. This is a single-lined spectroscopic binary with an orbital period of 23.96924 days. The visible component is an orange-hued K-type giant star with a stellar classification of K0 III, indicating it has exhausted the supply of hydrogen at its core then cooled and expanded off the main sequence. It is around eight billion years old with 26% more mass than the Sun and has expanded to 11 times the Sun's radius. It is radiating roughly 30 times the luminosity of the Sun from its photosphere at an effective temperature of 4,620 K. The star is "covered with large high-latitude and even polar spots and with occasional small equatorial spots". XX Tri is notable for having a huge starspot larger than the diameter of the Sun, discovered using Doppler imaging. For its size, the star has a relatively rapid rotation rate of about 24 days. It has a weak, Sun-like differential rotation. The star appears to show a magnetic activity cycle of 26±6 years, although only a single cycle has been observed as of 2015. (en) HD 12545, identificata anche come XX Trianguli, è una stella gigante arancione di classe spettrale K0 di magnitudine 8,1 situata nella costellazione del Triangolo. Di diametro circa dieci volte superiore e di massa doppia del Sole, dista circa 1 000 anni luce dal sistema solare. Nota per la particolarità della scoperta nel 1999 di una gigantesca macchia stellare, la più estesa rilevata su una superficie stellare fino a quel momento, effettuata tramite gli strumenti dell'Osservatorio di Kitt Peak. (it) 三角座XX（XX Trianguli）是一顆位於三角座的獵犬座RS型變星，是光譜型 K0III 的橙色巨星。三角座XX因為有一個直徑遠比太陽巨大的星斑而聞名。該星斑是以法發現於1999年。 (zh) |
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| dbp:appmagV | 8.100000 (xsd:double) |
| dbp:class | K0 III (en) |
| dbp:constell | dbr:Triangulum |
| dbp:epoch | J2000.0 (en) |
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| dbp:parallax | 5.082000 (xsd:double) |
| dbp:periodUnitless | 2070942.336 |
| dbp:propMoDec | −14.160 (en) |
| dbp:propMoRa | −53.222 (en) |
| dbp:rotation | days (en) |
| dbp:uB | +0.78 (en) |
| dbp:variable | dbr:RS_Canum_Venaticorum_variable |
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| rdfs:comment | XX du Triangle XX Trianguli Autres désignations XX Tri, BD+34°363, GJ 3130, HD 12545, HIP 9630, SAO 55233 XX Trianguli (en abrégé XX Tri, en français XX du Triangle) est une étoile géante rouge variable de la constellation du Triangle à la surface de laquelle une grande tache a été observée et suivie par , ce qui a permis de modéliser son évolution au cours du temps. Elle est distante d'environ 197 pc (∼643 a.l.) de la Terre. (fr) HD 12545, identificata anche come XX Trianguli, è una stella gigante arancione di classe spettrale K0 di magnitudine 8,1 situata nella costellazione del Triangolo. Di diametro circa dieci volte superiore e di massa doppia del Sole, dista circa 1 000 anni luce dal sistema solare. Nota per la particolarità della scoperta nel 1999 di una gigantesca macchia stellare, la più estesa rilevata su una superficie stellare fino a quel momento, effettuata tramite gli strumenti dell'Osservatorio di Kitt Peak. (it) 三角座XX（XX Trianguli）是一顆位於三角座的獵犬座RS型變星，是光譜型 K0III 的橙色巨星。三角座XX因為有一個直徑遠比太陽巨大的星斑而聞名。該星斑是以法發現於1999年。 (zh) XX Trianguli, abbreviated XX Tri, is a variable star in the northern constellation of Triangulum, about 1.5° to the WNW of Beta Trianguli along the constellation border with Andromeda. It is classified as a RS Canum Venaticorum variable and ranges in brightness from magnitude 8.1 down to 8.7, which is too faint to be visible to the naked eye. The system is located at a distance of approximately 642 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −26 km/s. (en) |
| rdfs:label | XX Trianguli (fr) HD 12545 (it) XX Trianguli (en) 三角座XX (zh) |
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