Manual Bresser 70-900 - National Geographic 90-71000 (page 15 of 40) (English, German, Dutch, French, Italian, Polish, Spanish)

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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 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 (M42) (No. 21)

Right Ascension: 05

(hours : minutes)

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

(hours : minutes)

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 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 (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

(hours : minutes)

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

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.

Warranty and Warranty Term Extension

The warranty term is two years from the date of purchase. Please keep your

proof of purchase. Register at www.bresser.de/warranty and ﬁ ll out a brief

questionnaire to get your warranty term extended to ﬁ ve years. Registra-

tion must be completed within three months of purchase (date of receipt) to

validate the warranty. If you register thereafter, the warranty term will not be

extended. If you have problems with your device, please contact our cus-

tomer service ﬁ rst. Do not send any products without consulting us ﬁ rst by

telephone. Many problems with your device can be solved over the phone. If

the problem cannot be resolved by phone, we will take care of transporting

your device to be repaired. If the problem occurred after the warranty ended

or it is not covered by our warranty terms, you will receive an estimate of

repair costs, free of charge.

Service Hotline: +49 (0) 2872 - 80 74-210

Important for any returns:

Please make sure to return the device carefully packed in the original pack-

aging in order to prevent damage during transport. Also, please enclose your

receipt for the device (or a copy) and a description of the defect. This war-

ranty does not imply any restriction of your statutory rights.

Your dealer: ......................................................................................

Art. No.: ...........................................................................................

Description of problem: ......................................................................

.......................................................................................................

Name: .............................................................................................

Street: .............................................................................................

City/Postcode: ..................................................................................

Telephone: .......................................................................................

Date of purchase: ..............................................................................

Signature: ........................................................................................

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Bresser 70-900 - National Geographic 90-71000 Manual

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