Bresser National Geographic 114/900 AZ Mode D'emploi page 13

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 end of the manual show what the objects will look like through your
telescope's eyepiece.
The moon (No. 31)
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 sec-
ond 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).
Constellation Orion: The Orion Nebula (M 42) (No. 32)
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
(M 42) is the brightest diffuse nebula in the sky. It is visible even with the
naked eye and 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 (M 57) (No. 33)
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 show that it
is probably comprised of a ring (torus) of brightly shining material that sur-
rounds 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 (M 27).
When viewed from Earth, we are looking directly at the pole of the nebula.
Constellation Vulpecula (Little Fox):
The Dumbbell Nebula (M 27) (No. 34)
Right Ascension: 19 h 59 m (hours : minutes)
Declination: +22° 43' (Degrees : minutes)
Distance: 1,360 light years from Earth
The Dumbbell Nebula (M 27) was the first planetary nebula ever discov-
ered. On 12 July 1764, Charles Messier discovered this new and fascinat-
ing 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 (M 57). In reasonably good weather, we can see
this object well, even with low magnification.
DE
2. Troubleshooting
Problem: Solution:
No picture Remove dust protection cap and
sunbathe-shield from the objective open-
ing.
Blurred picture Adjust focus using focus ring.
No focus possible Wait for temperature to balance out.
Bad picture quality Never observe through a glass surface.
Viewing object visible Adjust finder (See Part II-4),
in the finder, but not
through the telescope
Despite using star The star diagonal prism
diagonal prism, 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
information on the proper disposal.
Please take the current legal regulations into account
when disposing of your device. You can get more informa-
tion on the proper disposal from your local waste-disposal
service or environmental authority.
EN FR NL IT ES PL RU
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