IC 2118
| Reflexionsnebel | |
|---|---|
| Hexenkopfnebel | |
 | |
| Der blau leuchtende Hexenkopfnebel | |
| Sternbild | Eridanus |
| Position Äquinoktium: J2000.0 | |
| Rektaszension | 05h 04m 55,4s [1] |
| Deklination | -07° 15′ 56″ [1] |
| Weitere Daten | |
| Winkelausdehnung | 180 × 60 [2] |
| Entfernung | 1000 Lj |
| Geschichte | |
| Entdeckung | William Herschel |
| Datum der Entdeckung | 20. Dezember 1786 |
| Katalogbezeichnungen | |
| NGC 1909 • IC 2118 • H V 38 • LBN 959 • GC 1116 • Ced 41 | |
| Aladin previewer | |
IC 2118, aufgrund seiner Form auch Hexenkopfnebel genannt, ist ein Reflexionsnebel im Sternbild Fluss Eridanus. Er wird durch Rigel, den hellsten Stern im Sternbild Orion, zum Leuchten angeregt. Der Nebel erscheint in blauem Licht, da seine feinen Staubteilchen blau effektiver reflektieren können als rot.
Weblinks
Commons: IC 2118 – Sammlung von Bildern, Videos und Audiodateien
- Hexenkopfnebel
- Spektrum.de: Amateuraufnahmen [1]
Einzelnachweise
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Witch head nebula.jpg
As the name implies, this reflection nebula associated with the star Rigel looks suspiciously like a fairytale crone. Formally known as IC 2118 in the constellation Orion, the Witch Head Nebula glows primarily by light reflected from the star. The color of this very blue nebula is caused not only by blue color of its star, but also because the dust grains reflect blue light more efficiently than red. A similar physical process causes Earth's daytime sky to appear blue.
As the name implies, this reflection nebula associated with the star Rigel looks suspiciously like a fairytale crone. Formally known as IC 2118 in the constellation Orion, the Witch Head Nebula glows primarily by light reflected from the star. The color of this very blue nebula is caused not only by blue color of its star, but also because the dust grains reflect blue light more efficiently than red. A similar physical process causes Earth's daytime sky to appear blue.