NGC 4818

Galaxie
NGC 4818
{{{Kartentext}}}
AladinLite
Sternbild Jungfrau
Position
Äquinoktium: J2000.0, Epoche: J2000.0
Rektaszension 12h 56m 48,9s [1]
Deklination −08° 31′ 31″ [1]
Erscheinungsbild
Morphologischer Typ SAB(rs)ab / Sbrst[1]
Helligkeit (visuell) 11,3 mag[2]
Helligkeit (B-Band) 12,1 mag[2]
Winkel­ausdehnung 4,3′ × 1,5′[2]
Positionswinkel 0°[2]
Inklination °
Flächen­helligkeit 13,2 mag/arcmin²[2]
Physikalische Daten
Zugehörigkeit LGG 307[1][3]
Rotverschiebung 0.003552 ± 0.000103[1]
Radial­geschwin­digkeit (1065 ± 31) km/s[1]
Hubbledistanz
H0 = 73 km/(s • Mpc) 		(43 ± 3) · 106 Lj
(13,2 ± 1,0) Mpc [1]
Absolute Helligkeit mag
Masse M☉
Durchmesser Lj
Metallizität [Fe/H] {{{Metallizität}}}
Geschichte
Entdeckung Wilhelm Herschel
Entdeckungsdatum 3. März 1786
Katalogbezeichnungen
NGC 4818 • PGC 44191 • MCG -01-33-057 • IRAS 12542-0815 • 2MASX J12564890-0831310 • Mrk 9022 • GC 3318 • H II 549 • h 1484/3445 • LDCE 904 NED283

NGC 4818 ist eine Balken-Spiralgalaxie vom Hubble-Typ SBab im Sternbild Jungfrau nördlich der Ekliptik. Sie ist schätzungsweise 43 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 60.000 Lichtjahren.

Im selben Himmelsareal befinden sich u. a. die Galaxien NGC 4773, NGC 4777, NGC 4780, IC 3883.

Das Objekt wurde am 3. März 1786 von Wilhelm Herschel[4] mit einem 18,7–Zoll–Spiegelteleskop entdeckt, der sie dabei mit „pB, vL, iF, lbM“ beschrieb. John Herschel notierte bei seiner Beobachtung im Jahr 1834: „B, L, mE in meridian, gpmbM, 3′ long“.[5]

Commons: NGC 4818 – Sammlung von Bildern, Videos und Audiodateien
  • NGC 4818. SIMBAD, abgerufen am 15. Februar 2015 (englisch).
  • NGC 4818. DSO Browser, abgerufen am 15. Februar 2015 (englisch).

Einzelnachweise

  1. ↑ a b c d e NASA/IPAC EXTRAGALACTIC DATABASE
  2. ↑ a b c d e SEDS: NGC 4818
  3. ↑ VizieR
  4. ↑ Seligman
  5. ↑ Auke Slotegraaf: NGC 4818. Deep Sky Observer's Companion, abgerufen am 15. Februar 2015 (englisch).

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