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The Moon
The moon is the Earth's only natural satellite.
Diameter:
3.476 km (2.2 miles)
Distance: approx.
384,401 km (216,486 miles)
The moon has been known to humans since
prehistoric times. It is the second brightest object in
the sky (after the sun). Because the moon circles the
Earth once per month, the angle between the Earth,
the moon and the sun is constantly changing; one
sees this change in the phases of the moon. The time
between two consecutive new moon phases is about
29.5 days (709 hours).
Orion Nebula (M 42)
M 42 in the Orion constellation
Right ascension:
05:32.9 (hours: minutes)
Declination:
-0.5˚ 25' (degrees: minutes)
Distance:
1.500 light years
With a distance of about 1.500 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 fi eld glass to the largest
earthbound observatories and the Hubble Space
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.
Terrestrial images
f=20 mm
f=12.5 mm
Ring Nebula in Lyra constellation (M 57)
M 57 in the Lyra constellation
Right ascension:
18:51.7 (hours: minutes)
Declination:
+33˚ 01' (degrees: minutes)
Distance:
2.3 light years
The
famous
Ring
Nebula
abbreviation: M 57) in the constellation of Lyra
is often viewed as the prototype of a planetary
nebula; it is one of the magnifi cent 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 (M 27). With this object, we're
looking directly at the pole of the nebula.
Dumbbell Nebula in the Vulpecula (Fox)
constellation (M 27)
M 27 in the Fox constellation
Right ascension:
19:59.6 (hours: minutes)
Declination:
+22˚ 43' (angle: minutes)
Distance:
1.360 light years
The Dumbbell Nebula (Messier 27, abbreviation:
M 27) in Fox was the fi rst 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
magnifi cations.
The Moon
Orion Nebula (M 42)
Ring Nebula in Lyra
constellation (M 57)
Dumbbell Nebula in the
Vulpecula (Fox)
constellation (M 27)
4
(Messier
57,
f=20 mm
f=12.5 mm
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