Warranty & Service - Bresser NATIONAL GEOGRAPHIC 9071000 Mode D'emploi

Part III—Appendix
1. Possible Observation Targets
The following section details several interesting and easy-to-find celestial
objects you may want to observe through your telescope. The pictures at the
beginning of the manual show what the objects will look like through your
telescope's eyepiece.
The Moon (No. 20)
The moon is Earth's only natural satellite.
Diameter: 3,476 km
Distance: 384,400 km from Earth (average)
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 con-
stantly 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).
Constellation Orion: The Orion Nebula (M42) (No. 21)
Right Ascension: 05 35 (hours : minutes)
h m
Declination: -05° 22' (degrees : minutes)
Distance: 1,344 light years from Earth
Though it is more than 1,344 light years from Earth, the Orion Nebula (M42)
is the brightest diffuse nebula in the sky. It is visible even with the naked eye
and is a worthwhile object for telescopes of all types and sizes. The nebula
consists of a gigantic cloud of hydrogen gas with a diameter of hundreds of
light years.
Constellation Lyra: The Ring Nebula (M57) (No. 22)
Right Ascension: 18 53 (hours : minutes)
h m
Declination: +33° 02' (degrees : minutes)
Distance: 2,412 light years from Earth
The famous Ring Nebula (M57) in the Lyra constellation 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 prob-
ably comprised of a ring (torus) of brightly shining material that surrounds the
central star (only visible with larger telescopes), and not a gas structure in the
form of a sphere or an ellipse. If you were to look at the Ring Nebula from the
side, it would look like the Dumbbell Nebula (M27). When viewed from Earth,
we are looking directly at the pole of the nebula.
Constellation Vulpecula (Little Fox):
The Dumbbell Nebula (M27) (No. 23)
Right Ascension: 19 59 (hours : minutes)
h m
Declination: +22° 43' (degrees : minutes)
Distance: 1,360 light years from Earth
The Dumbbell Nebula (M27) was the first planetary nebula ever discovered.
On 12 July 1764, Charles Messier discovered this new and fascinating class
of objects. We see this object almost directly from its equatorial plane. If
we could see the Dumbbell Nebula from one of its poles, we would probably
see the shape of a ring, something very similar to what we know as the Ring
Nebula (M57). In reasonably good weather, we can see this object well, even
with low magnification.
2. Troubleshooting
Problem: Solution:
No picture Remove dust protection cap
from the objective opening.
Blurred picture Adjust focus using the focus wheel.
No focus possible Wait for temperature to balance out.
Bad picture quality Never observe through a glass surface.
Object is visible Adjust viewfinder scope
in the viewfinder scope, (See Part I, Section 6).
but not through the telescope.
Despite using The diagonal mirror
diagonal mirror, should be vertical in
the picture is the eyepiece connection.
crooked.
DISPOSAL
Dispose of the packaging materials properly, according to
their type, such as paper or cardboard. Contact your local
waste-disposal service or environmental authority for infor-
mation on the proper disposal.
Please take the current legal regulations into account when
disposing of your device. You can get more information on
the proper disposal from your local waste-disposal service
or environmental authority.
WARRANTY & SERVICE
The regular guarantee period is 5 years and begins on the day of
purchase. You can consult the full guarantee terms and details of our
services at: www.bresser.de/warranty_terms.
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