Description of
object: The Eta Carinae nebula (or
short Carina-Nebula) is one of the biggest star birth regions in the milky way
and can easily be seen with the naked eye in its southern part. The distance is
estimated to be somewhere between 6500 and 10000 light years. With a diameter
of approximately 2 degrees in the sky, the absolute dimension of the nebula is
200 light years. The picture shown above contains only the central region of
the nebula, which covers about the same area in the sky as the moon.
Eta Carinae is one of the
heaviest stars in the milky way. Its luminosity is an unbelievable 4 million
times stronger than that of the sun. It is situated in a double star system and
well known for eruptions and accompanying changes in brightness. The last big
eruption was between 1837 and 1856. During this period Eta Carinae ejected a
large amount of gas, which now envelopes the star as a thin but very bright
layer called the Homunkulus nebula. Because of its brightness it's one of the
few deep sky objects that have a color (in this case orange) when viewed
through a telescope.
A picture of
a section of the Homunkulus nebula which was taken by the Hubble telescope
is shown here. The Keyhole Nebula is an area on the
Carina-Nebula , which is in front of the brighter parts and absorbs the light
in the form of a key hole. |