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Orion Nebula (M 42)
M 42 in the Orion constellation (Figure 14)
Right ascension: 05:32.9 (Hours: Minutes)
Declination: -05:25 (Degrees: Minutes)
Distance: 1.500 light years
With a distance of about 1500 light years, the
Orion Nebula (Messier 42, abbreviation: M
42) is the brightest diffuse nebula in the sky
– visible with the naked eye, and a rewarding
object for telescopes in all sizes, from the
smallest field glass to the largest earthbound
observatories
and
the
Hubble
Telescope.
When talking about Orion, we're actually
referring to the main part of a much larger
cloud of hydrogen gas and dust, which
spreads out with over 10 degrees over the half
of the Orion constellation. The expanse of this
enormous cloud stretches several hundred
light years.
Ring Nebula in Lyra constellation (M 57)
M 57 in the Lyra constellation (Figure 15)
Right ascension: 18:51.7 (Hours: Minutes)
Declination: -+32:58 (Degrees: Minutes)
Distance: 2.000 light years
The famous Ring Nebula M 57 in the
constellation of Lyra is often viewed as the
prototype of a planetary nebula; it is one of
the magnificent features of the Northern
Hemisphere's summer sky. Recent studies
have shown that it is probably comprised of
a ring (torus) of brightly shining material that
surrounds the central star (only visible with
larger telescopes), and not of a gas structure
in the form of a sphere or an ellipsis.
If you were to look at the Ring Nebula from
the side, it would look like the Dumbbell
Nebula (M27). With this object, we're looking
directly at the pole of the nebula.
Space
Dumbbell Nebula in the Vulpecula (Fox)
constellation (M 27)
M 27 in the Fox constellation (Figure 16)
Right ascension: 19:59.6 (Hours: Minutes)
Declination: -+22:43 (Angle: Minutes)
Distance: 1.250 light years
The Dumbbell Nebula (M 27) in Fox was the
first planetary nebula ever discovered. On July
12, 1764, Charles Messier discovered this
new and fascinating class of objects. We see
this object almost directly from its equatorial
plane. If you could see the Dumbbell Nebula
from one of the poles, it would probably
reveal the shape of a ring, and we would see
something very similar to what we know from
the Ring Nebula (M 57). In reasonably good
weather, we can see this object well even with
small magnifications.
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