NGC 3991

Galaxie
NGC 3991
{{{Kartentext}}}
SDSS-Aufnahme von NGC 3991
AladinLite
Sternbild Großer Bär
Position
Äquinoktium: J2000.0, Epoche: J2000.0
Rektaszension 11h 57m 31,1s [1]
Deklination +32° 20′ 16″ [1]
Erscheinungsbild
Morphologischer Typ Im pec[1]
Helligkeit (visuell) 13,0 mag[2]
Helligkeit (B-Band) 13,6 mag[2]
Winkel­ausdehnung 1,3′ × 0,3′[2]
Positionswinkel 33°[2]
Inklination °
Flächen­helligkeit 11,8 mag/arcmin²[2]
Physikalische Daten
Zugehörigkeit LGG 259[1][3]
Rotverschiebung 0.010647 ± 0.000017[1]
Radial­geschwin­digkeit (3192 ± 5) km/s[1]
Hubbledistanz
H0 = 73 km/(s • Mpc) 		(143 ± 10) · 106 Lj
(43,7 ± 3,1) Mpc [1]
Absolute Helligkeit mag
Masse M☉
Durchmesser 55.000 Lj
Metallizität [Fe/H]
Geschichte
Entdeckung Heinrich d’Arrest
Entdeckungsdatum 5. Februar 1864
Katalogbezeichnungen
NGC 3991 • UGC 6933 • PGC 37613 • CGCG 186-073 • MCG +06-26-060 • IRAS 11549+3237 • KUG 1154+326 • 2MASX J11573046+3220030 • Arp Teil von 313 • VV 523 • HARO 5

NGC 3991 ist eine irreguläre Galaxie vom Hubble-Typ Im im Sternbild Großer Bär am Nordsternhimmel. Sie ist schätzungsweise 143 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 55.000 Lj. Gemeinsam mit NGC 3994 und NGC 3995 bildet sie das Galaxientrio Arp 313. Halton Arp gliederte seinen Katalog ungewöhnlicher Galaxien nach rein morphologischen Kriterien in Gruppen. Dieses Galaxientriplett gehört zu der Klasse Gruppen von Galaxien.

Das Objekt wurde am 5. Februar 1864 von dem Astronomen Heinrich Louis d’Arrest entdeckt.[4]

Commons: NGC 3991 – Sammlung von Bildern, Videos und Audiodateien

Literatur

  • Jeff Kanipe und Dennis Webb: The Arp Atlas of Peculiar Galaxies – A Chronicle and Observer´s Guide, Richmond 2006, ISBN 978-0-943396-76-7

Einzelnachweise

  1. ↑ a b c d e NASA/IPAC EXTRAGALACTIC DATABASE
  2. ↑ a b c d e SEDS: NGC 3991
  3. ↑ VizieR
  4. ↑ Seligman

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