Metraipolis › archive › dc_f44fd47ce366

12 Ophiuchi — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/12_Ophiuchi
License (as archived): CC-BY-SA-4.0
Archived: 2026-10-07T21:09:14.904Z
SHA-256 of the archived text: 1f7138c1b269855797b2645715797e97eea550a43736743b9324a2b4f3c942ec
Stable URL of this page: https://metraipolis.com/documento/dc_f44fd47ce366

How to cite

12 Ophiuchi — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/12_Ophiuchi (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_f44fd47ce366 (Metraipolis archive dc_f44fd47ce366, sha256 1f7138c1b269855797b2645715797e97eea550a43736743b9324a2b4f3c942ec)

BibTeX

@misc{dcf44fd47ce366,
  title = {12 Ophiuchi — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/12_Ophiuchi},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_f44fd47ce366; sha256 1f7138c1b269855797b2645715797e97eea550a43736743b9324a2b4f3c942ec},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/12_Ophiuchi. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

12 Ophiuchi is a variable star 32.3 light-years away in the constellation Ophiuchus. No companions have yet been detected in orbit around this star, and it remains uncertain whether or not it possesses a dust ring. This star is categorized as a BY Draconis variable, with variable star designation V2133. The variability is attributed to large-scale magnetic activity on the chromosphere (in the form of starspots) combined with a rotational period that moved the active regions into (and out of) the line of sight. This results in low amplitude variability of 12 Ophiuchi's luminosity. The star also appears to display rapid variation in luminosity, possibly due to changes in the starspots. Measurements of the long-term variability show two overlapping cycles of starspot activity (compared to the Sun's single, 11-year cycle.) The periods of these two cycles are 4.0 and 17.4 years. This star was among the top 100 target stars for NASA's canceled Terrestrial Planet Finder mission. Its abundance of heavy elements (elements heavier than helium) is nearly identical to that of the Sun. The surface gravity is equal to log ( g ) = 4.6 {\displaystyle \log(g)=4.6} , which is somewhat higher than the Sun's. The space velocity is 30 km/s relative to the Solar System. The high rotation period and active chromosphere are indicative of a relatively young star.

Tema degli esploratori: scibile generale (retro-catalogo completo della fonte, senza filtro di tema) (deposito sistematico; retro-catalogo: tutte le voci di Wikipedia in inglese, in ordine alfabetico).
Fonte: Wikipedia in inglese, voce «12 Ophiuchi» — https://en.wikipedia.org/wiki/12_Ophiuchi
Wikidata Q115904 (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q115904
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/12_Ophiuchi?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1374437710, consultata il 2026-10-07T20:40:43.506Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: 16f49678cd9d2100ed6d55f009566c66c8459f730beb4942ec6ce53b513121a1