NGC 246

Planetarischer Nebel
NGC 246
Aufnahme mit dem 81-cm-Spiegelteleskop des Mount-Lemmon-Observatoriums
Aufnahme mit dem 81-cm-Spiegelteleskop des Mount-Lemmon-Observatoriums
AladinLite
Sternbild Walfisch
Position
Äquinoktium: J2000.0
Rektaszension 00h 47m 03,3s [1]
Deklination (Astronomie) −11° 52′ 17″ [1]
Erscheinungsbild
Scheinbare Helligkeit (visuell) 10,9 mag [2]
Scheinbare Helligkeit (B-Band) 8,0 mag [2]
Winkelausdehnung 4,08′ × 4,08′  
Zentralstern
Bezeichnung HIP 3678 (WD 0044-121) [3]
Scheinbare Helligkeit 11,77 mag [4]
Spektralklasse B0 [4]
Physikalische Daten
Rotverschiebung +0,000130 [3]
Radialgeschwindigkeit +39 km/s [3]
Entfernung 1813 ± 79 Lj [5]
Absolute Helligkeit +11,78 mag 
Alter 6.600 Jahre
Geschichte
Entdeckung Wilhelm Herschel
Datum der Entdeckung 27. November 1785
Katalogbezeichnungen
 NGC 246 • PK 118-74.1 • GC 131 • H V 25 • h 56 • PN G118.8-74.7

NGC 246 ist die Bezeichnung für einen planetarischen Nebel im Sternbild Walfisch.

Eigenschaften

NGC 246 ist ca. 2000 Lichtjahre entfernt und hat eine Winkelausdehnung von 4,0' × 3,5'. Die absolute Helligkeit liegt bei 11,78 mag, seine scheinbare Helligkeit bei 10,9 mag. Der Nebel wird durch einen in seinem Zentrum liegenden Stern im Endstadium seiner Entwicklung gebildet, der seine äußere Hülle abstößt. Der Zentralstern entwickelt sich dabei zu einem heißen Weißen Zwerg.[6]

Der planetarische Nebel NGC 246 wurde am 27. November 1785 von dem deutsch-britischen Astronomen Friedrich Wilhelm Herschel entdeckt.[7] Im englischen Sprachraum hat das Objekt wegen der groben Ähnlichkeit mit einem Schädel auch den Trivialnamen skull nebula.

Literatur

  • König, Michael & Binnewies, Stefan (2023): Bildatlas der Sternhaufen & Nebel, Stuttgart: Kosmos, S. 217
Commons: NGC 246 – Sammlung von Bildern, Videos und Audiodateien

Einzelnachweise

  1. NASA/IPAC EXTRAGALACTIC DATABASE
  2. NGC 246
  3. a b SIMBAD database, operated at CDS, Strasbourg, France
  4. a b The Hipparcos and Tycho Catalogues at ESA
  5. Astronomie.de / der Treffpunkt für Astronomie. Abgerufen am 9. August 2020.
  6. NGC 246 and the Dying StarAstronomy Picture of the Day vom 18. April 2006 (englisch).
  7. Courtney Seligman: NGC 246, the Skull Nebula (= C56 = PK 118-74.1 = "PGC 3143104"). In: Celestial Atlas : NGC Objects: NGC 200–249. 1. Februar 2022. Auf CSeligman.com, abgerufen am 12. Oktober 2024 (englisch).

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