Bresser 70/900 NG Instrucciones De Uso página 25

1. Technical data:
• Double-lens system (achromatic)
made of glass
• Alt-azimuth mount with equatorial
wedge (Optimised mounting system
with flexible shafts)
• Magnification: 45x – 337.5x
• Lens Diameter: 70 mm
• Focal Length: 900 mm
• 3 eyepieces: K-20 / K-12 / K-4 mm
• Diagonal Mirror
• 6x25 Viewfinder
• 1,5x Erecting lens
• Adjustable Aluminium Tripod
2. Possible objects for observation:
We have compiled and explained a number of
very interesting celestial bodies and star clus-
ters for you. On the accompanying images
at the end of the instruction manual, you can
see how objects will appear in good viewing
conditions through your telescope using the
eyepieces that came with it.
The Moon
The moon is the Earth's only natural satellite.
Figure 19)
Diameter: 3.476 km
Distance: approx. 384 401 km
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 (Figure 20)
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 – visi-
ble with the naked eye, and a rewarding object
for telescopes in all sizes, from the smallest
field glass to the largest earthbound observa-
tories and the Hubble Space Telescope.
When talking about Orion, we're actually re-
ferring 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 21)
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 constel-
lation of Lyra is often viewed as the prototype
of a planetary nebula; it is one of the magni-
ficent 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 telesco-
pes), and not of a gas structure in the form of
a sphere or an ellipsis. If you were to look at
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