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21 Arietis — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/21_Arietis
License (as archived): CC-BY-SA-4.0
Archived: 2026-11-06T11:08:26.365Z
SHA-256 of the archived text: 55b454483df3699112c154f381f646cdee5aea08646ab41e6f6df93f4c257533
Stable URL of this page: https://metraipolis.com/documento/dc_764091bfc2fe

How to cite

21 Arietis — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/21_Arietis (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_764091bfc2fe (Metraipolis archive dc_764091bfc2fe, sha256 55b454483df3699112c154f381f646cdee5aea08646ab41e6f6df93f4c257533)

BibTeX

@misc{dc764091bfc2fe,
  title = {21 Arietis — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/21_Arietis},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_764091bfc2fe; sha256 55b454483df3699112c154f381f646cdee5aea08646ab41e6f6df93f4c257533},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/21_Arietis. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

21 Arietis (abbreviated 21 Ari) is a binary star system in the northern constellation of Aries. 21 Arietis is the Flamsteed designation. It has a combined apparent visual magnitude is 5.57; the brighter member is magnitude 6.40 while the fainter star is magnitude 6.48. The distance to this star system, based upon an annual parallax shift of 19.58 mas, is 167 light-years (51 parsecs). The pair orbit each other with a period of 23.70 years and an eccentricity of 0.68. The system was initially thought to be a triple system in 1981, since the orbit of the system predicted a mass greater than would be expected from its F6V spectral type. This was later rejected because the distance to the system was overestimated. However, while observing the spectrum of the system, it was found that a giant planet may be causing radial velocity variations. The purported planet would have a mass of 1.40 ± 0.36 MJ, an orbital period of 925 days and orbit the primary 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 «21 Arietis» — https://en.wikipedia.org/wiki/21_Arietis
Wikidata Q2401491: «stella nella costellazione dell'Ariete» (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q2401491
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/21_Arietis?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 1379399287, consultata il 2026-11-06T11:04:53.010Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: 62db078be81215c4b135e239cc390df0c4afe7fc69a04fd4822a8eec899a28ec