Celestron NexStar 8 Bedienungsanleitung

2021/10/09 17:28 1/9 C8 & Celestron Advanced GT

OST Wiki - https://polaris.astro.physik.uni-potsdam.de/wiki/

C8 & Celestron Advanced GT

The Celestron 8 (C8) is our smallest Schmidt Cassegrain telescope not accounting for binoculars or

ﬁnderscopes. The telescope is usually attached to a Celestron Advanced GT mount, which can be can

be set up by a single person because of its compact construction.

Assembly

In the following the setup of this telescope and the mount will be explained step by step:

Description Used parts Telescope after the corresponding step

One needs to

carefully choose

the place where

the telescope

should be placed.

For example, the

relevant part of

the sky needs to

be visible (the

dome covers a

certain part of

the sky when the

telescope is

setup on the

roof) and the

cables of the

power supply or

the cameras

should not

become tripping

hazards. The

example setup

was performed in

the laboratory-

course room

directly behind

the door →

directly in the

way, hidden, and

no sky → Bad

choice!

Last update:

2021/06/08

14:24

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The tripod is the

backbone of the

telescope.

This disk is used

to stabilize the

legs of the tripod

from the inside.

The rod that

punctures this

disk will be

screwed (with

the side showing

the thread) from

below into the

basis of the

tripod. This

needs to be done

until the thread is

completely

visible on the

other side. The

rod should now

be vertically

slidable.

2021/10/09 17:28 3/9 C8 & Celestron Advanced GT

OST Wiki - https://polaris.astro.physik.uni-potsdam.de/wiki/

Now the mount

can be put on the

tripod basis. One

has to take care

that little

chromed pin

from the basis of

the tripod needs

to be placed in

the

corresponding

housing of the

mount.

In the next step

the

counterweight

bar and the

counterweights

needs to

attached to the

back-end of the

mount. First the

counterweight

bar needs to

thread into the

opening of the

declination axis.

Afterwards the

screw at the end

of the

counterweight

bar can be

removed and the

counterweight

can be place and

ﬁxated on the

counterweight

bar.

Subsequently,

the screw can be

reattached to the

end of the

counterweight

bar.

Last update:

2021/06/08

14:24

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In the next step

the tube needs to

be attached to

the mount. The

tube is equipped

with a so-called

dove tail (the

orange thing)

that allows a

quick and easy

attachment of

the tube to the

mount. Simply,

insert the

dovetail into the

clamp of the

mount and

tighten the screw

of the clamp.

2021/10/09 17:28 5/9 C8 & Celestron Advanced GT

OST Wiki - https://polaris.astro.physik.uni-potsdam.de/wiki/

Afterwards the

hand terminal

and the power

supply can be

connected to the

telescope. Both

can be simply

plugged into the

labeled ports of

the mount. For

the hand

terminal the

corresponding

holder should be

attached to the

tripod ﬁrst, so

that it can be

safely stored.

Subsequently,

the cover can be

removed from

the tube.

Last update:

2021/06/08

14:24

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If needed, the

sun ﬁlter can be

attached to the

tube. Thread the

screws on the

side of the sun

ﬁlter, so that it

cannot fall oﬀ

when the

telescope is

moving.

Before using the

telescope you

have to tare the

rotation axes.

First lose the

clutch knobs

ﬁxing the right-

ascension axis,

until you can

freely move the

telescope around

this axis. Now

adjust the

position of the

counterweight

such that there is

no movement

along this axis

anymore. Tighten

the clutch knobs

again and repeat

this procedure

for the

declination axis.

As there are no

counterweights

for this axis, one

has to shift the

tube along the

clamp to tare the

declination axis.

2021/10/09 17:28 7/9 C8 & Celestron Advanced GT

OST Wiki - https://polaris.astro.physik.uni-potsdam.de/wiki/

Afterwards the

axes need to be

justiﬁed. To do

this, they need to

be move to the

index positions

as illustrated in

the image.

Now the

alignment can be

performed. This

procedure is very

similar to the one

of our C11 with

the exception

that the mount

will not

automatically

move to the

index positions

but fortunately

you already did

this in the step

before.

Last update:

2021/06/08

14:24

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https://polaris.astro.physik.uni-potsdam.de/wiki/ Printed on 2021/10/09 17:28

13 Finished!

Functions such as Hibernation

The operation of the Advanced GT as well as features like hibernation do not diﬀer from the CGE-Pro

and can be found in the article on the C11.

Troubleshooting

Known error sources and their solutions can be found here.

Additional documentation

More details on the Celestron Advanced GT and the C8 can be found in the corresponding manuals in

the lab course room.

From:

https://polaris.astro.physik.uni-potsdam.de/wiki/ - OST Wiki

Permanent link:

https://polaris.astro.physik.uni-potsdam.de/wiki/doku.php?id=en:ost:telescope:c8_bedienung

Last update: 2021/06/08 14:24

2021/10/09 17:28 9/9 C8 & Celestron Advanced GT

OST Wiki - https://polaris.astro.physik.uni-potsdam.de/wiki/

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