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21 Aquilae — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/21_Aquilae
License (as archived): CC-BY-SA-4.0
Archived: 2026-11-06T11:08:26.566Z
SHA-256 of the archived text: 127d1b1a02df422401b6f162606c0583b73e6b1823fa80c7462c18985a173ff1
Stable URL of this page: https://metraipolis.com/documento/dc_b9dd67ad08f5

How to cite

21 Aquilae — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/21_Aquilae (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_b9dd67ad08f5 (Metraipolis archive dc_b9dd67ad08f5, sha256 127d1b1a02df422401b6f162606c0583b73e6b1823fa80c7462c18985a173ff1)

BibTeX

@misc{dcb9dd67ad08f5,
  title = {21 Aquilae — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/21_Aquilae},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_b9dd67ad08f5; sha256 127d1b1a02df422401b6f162606c0583b73e6b1823fa80c7462c18985a173ff1},
  year = {2026}
}

Archived text

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

21 Aquilae is a solitary variable star in the equatorial constellation of Aquila. It has the variable star designation V1288 Aql; 21 Aquilae is its Flamsteed designation. This object is visible to the naked eye as a dim, blue-white hued star with a baseline apparent visual magnitude of about 5.1. The star is located at a distance of around 680 light-years (210 parsecs) from Earth, give or take a 20 light-year margin of error. It is moving closer to the Earth with a heliocentric radial velocity of –5 km/s. In 1962, Helmut A. Abt and John C. Gloson published data showing that 21 Aquilae was a variable star. Based on that publication, the star was given its variable star designation in 1972. The stellar classification of this star is B8 II-III, with the luminosity class of II-III suggesting that the spectrum displays elements of both a giant star and a bright giant. It is a chemically peculiar star of the Mercury-Manganese type (CP3), although some catalogues consider that status to be doubtful. This is a probable Alpha2 Canum Venaticorum variable that ranges in visual magnitude from 5.06 down to 5.16. The star is radiating 704 times the luminosity of the Sun from its photosphere at an effective temperature of 12,014 K; this gives it the blue-white glow of a B-type star. 21 Aquilae is catalogued as an optical double star, having a 12th magnitude companion 37″ away as of 2010. It was first identified as a double star by John Herschel. The companion is a distant background object.

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 Aquilae» — https://en.wikipedia.org/wiki/21_Aquilae
Wikidata Q2608320: «stella nella costellazione dell'Aquila» (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q2608320
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/21_Aquilae?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 1370771062, consultata il 2026-11-06T11:04:53.010Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: a5263b36034a30566000f744ce3a37c5a63f9505a8ee39b571e382d8ffb19115