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NGC 3372 - a mosaic the the large Eta Carinae
Nebula |
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Description of object:
NGC 3372 is located in the Carinae Arm of the Milky Way and is one of
the brightest and most aesthetic H-II emission nebulae and star formation
regions in the entire sky. The distance is not exactly known, the data vary
between 7500 and 10000 light years. It covers an apparent size of 2.5° x
2.5° in the sky, converted to a distance of 8000 light years this is 350 x
350 light years. This is significantly larger than the Orion Nebula, which
extends to just 40 light years. NGC 3372 is already clearly visible to the
naked eye.
A large number of young open star clusters with hot blue
stars, among them Collinder 228, 232 and 234, Trumpler 14, 15 and 16 as well as
Bochum 10 and 11, provide the strong UV radiation to ionize the hydrogen gas
and thus stimulate it to glow.
The best known single object in the
Carinae Nebula is the variable star ? (Eta) Carinae, which is part of the open
cluster Trumpler 16. Directly southwest of it lies "Herschels Keyhole Nebula".
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Eta
Carinae has an turbulent history behind it. At the moment it has a brightness
of the 6th magnitude. In 1843 it had a brightness of -0.8 magnitudes and in the
following 25 years the brightness decreased rapidly. At the following turn of
the century the brightness decreased up to the 8th magnitude and since then it
slowly increases again. By the outburst of 1843 the Homunculus Nebula was
formed from the ejecta of the star. Eta Carinae is definitely a double star
system, new researches even suggest a triple system. The star system is highly
unstable and definitely a "hot" candidate for a supernova explosions in the
near future.
Although the nebula
is one of the brightest objects in the night sky, it was documented late
because of its extremely southern position in the sky. The first reference to
the H-II region was published by Nicolas Louis de Lacaille in 1751/52 on a
voyage to the Cape of Good Hope. He catalogued the Nebula as Lacaille
III.6.
You can find more images
and detailed information of NGC 3372 from us here ...
Detailed central area of the Carinae Nebula and Herschel's
Keyhole Nebula and
Eta Carinae, the Homunculus Nebula and the open star
clusters Trumpler 14 and 16.
A
high-resolution image of the open star cluster
NGC 3293 shown here ... and the emission nebula
NGC 3324 here.
« Click here or the thumbnail to load a large annoted image
of NGC 3372 |
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All Images and all
Content are © by Franz Hofmann + Wolfgang Paech |