NGC 7721

Galaxie
NGC 7721
{{{Kartentext}}}
SDSS-Aufnahme
AladinLite
Sternbild Wassermann
Position
Äquinoktium: J2000.0, Epoche: J2000.0
Rektaszension 23h 38m 48,6s [1]
Deklination −06° 31′ 04″ [1]
Erscheinungsbild
Morphologischer Typ SA(s)c[1]
Helligkeit (visuell) 11,6 mag[2]
Helligkeit (B-Band) 12,2 mag[2]
Winkel­ausdehnung 2,8' × 1,1'[2]
Positionswinkel 15°[2]
Inklination °
Flächen­helligkeit 13,2 mag/arcmin²[2]
Physikalische Daten
Zugehörigkeit NGC 7721-Gruppe
LGG 481[1][3]
Rotverschiebung 0.006721 ± 0.000010[1]
Radial­geschwin­digkeit (2015 ± 3) km/s[1]
Hubbledistanz
H0 = 73 km/(s • Mpc) 		(94 ± 7) · 106 Lj
(28,9 ± 2,0) Mpc [1]
Absolute Helligkeit mag
Masse M☉
Durchmesser Lj
Metallizität [Fe/H]
Geschichte
Entdeckung William Herschel
Entdeckungsdatum 10. September 1785
Katalogbezeichnungen
NGC 7721 • PGC 72001 • MCG -01-60-017 • IRAS 23362-0647 • 2MASX J23384864-0631043 • GC 4997 • H II 432 • h 2260 • NVSS J233848-063104 • LDCE 1587 NED004 • HOLM 812A

NGC 7721 ist eine Spiralgalaxie vom Hubble-Typ Sc im Sternbild Aquarius auf der Ekliptik. Sie ist schätzungsweise 94 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 75.000 Lichtjahren.

Die Typ-Ia-Supernova SN 2007le wurde hier beobachtet.[4]

Das Objekt wurde am 10. September 1785 von Wilhelm Herschel entdeckt.[5]

NGC 7721-Gruppe (LGG 481)

Galaxie Alternativname Entfernung/Mio. Lj
NGC 7721 PGC 72001 94
PGC 72006 MCG -01-60-016 96
PGC 72252 MCG -01-60-026 98
Commons: NGC 7721 – Sammlung von Bildern, Videos und Audiodateien

Einzelnachweise

  1. ↑ a b c d e NASA/IPAC EXTRAGALACTIC DATABASE
  2. ↑ a b c d e SEDS: NGC 7721
  3. ↑ VizieR
  4. ↑ Simbad
  5. ↑ Seligman

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