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NGC 21

NGC 21
Date de observație
ConstelațieAndromeda[1]  Modificați la Wikidata
Deplasare spre roșu0,015801  Modificați la Wikidata
Distanță77,62 de megaparseci[2]  Modificați la Wikidata
Grup sau cluster[CHM2007] HDC 4[*][[[CHM2007] HDC 4 |​]][3]
[CHM2007] LDC 4[*][[[CHM2007] LDC 4 |​]][3]
[T2015] nest 200373[*][[[T2015] nest 200373 |​]][3]  Modificați la Wikidata
Magnitudine aparentă (V)12,8  Modificați la Wikidata
Caracteristici
TipSBbc
Sbc[3]  Modificați la Wikidata

NGC 21[4][5][6] este o galaxie spirală din constelația Andromeda. Denumirea de NGC 29 este sinonimă. A fost descoperită de William Herschel în 1790. Lewis Swift a observat-o din nou în 1885, conducând la duplicarea în New General Catalogue.

  1. ^ VizieR 
  2. ^ Cosmicflows-3[*][[Cosmicflows-3 (articol științific)|​]]  Verificați valoarea |titlelink= (ajutor)
  3. ^ a b c d SIMBAD 
  4. ^ NED. „NED results for object NGC 0021”. Accesat în . 
  5. ^ ipac. „Results for object NGC 0021 (NGC 21)”. Accesat în . 
  6. ^ spider.seds.org. „Revised NGC Data for NGC 21”. Accesat în . 

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NGC 21
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