Telescopes & Binoculars Telescope User Manual

INSTRUCTION MANUAL
IN 438 Rev. A 12/11
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© 2011 Orion Telescopes & Binoculars
1.25" Orion
®
Jupiter
Observation Filter
#5188
Congratulations on your
purchase of an 1.25" Orion
Jupiter Observation Filter!
Below we offer some quick
tips on using and getting the
most from your purchase.
WARNING: NOT intended for
solar observation.
Introduction
Jupiter is a great target in any telescope! Jupiter is the third
brightest object in the night sky, only the Moon and Venus
(depending on its phase) are ever brighter. After the Sun
and the Moon, Jupiter is the most detailed object to observe
in the sky. (CAUTION: Observe the sun only with the proper
solar filters; the Jupiter Observation Filter is NOT a solar
filter by itself!!!)
Jupiter provides an interesting object to observe in any tele-
scope; but like all celestial objects, the bigger the telescope,
the better the view you usually have of detail on Jupiter.
Binoculars can usually show you the four brightest moons of
Jupiter, but with a big telescope, say 10 inches in diameter
or larger, you can sometimes spot detail or shape on the
moons of Jupiter during periods of truly excellent “seeing.” It
usually takes a telescope of about 100 mm diameter to start
seeing some of more subtle detail on Jupiter and at least an
8-inch to really start pushing the limits of what the eye alone
can see on Jupiter.
So grab your telescope and take a look at Jupiter, there are
amazing sights to be seen nearly every night that Jupiter is
visible, and the Orion Jupiter Observation Filter will help you
make the most of your observing sessions.
In the Box
Inside the shipping container you will find a foam-lined,
plastic case. Inside will be the Orion Jupiter filter.
Quick Use Guide
The Orion Jupiter Observation Filter has a metal cell, the
end of the cell is threaded to accept the matching threads
on the inside barrel of every Orion 1.25" eyepiece. The
threads match most other eyepieces as well.
To install the Orion Jupiter Observation Filter, simply remove
the filter from its case and thread the filter into the bottom
of a 1.25"eyepieces (also called an “ocular”). Insert the eye-
piece into the telescope and focus on Jupiter.
Compared to viewing without the filter, you should notice an
immediate increase in contrast of Jupiter’s main equatorial
belts (there are two prominent belts, one on each side of
Jupiter’s equator – they are the major features on Jupiter;
they can fade or deepen in intensity with time) and Jupiter’s
famous “Great Red Spot” should also be more pronounced
with this filter! Note, since Jupiter rotates very rapidly (just
under 10 hours!) some evenings the Great Red Spot is vis-
ible and sometimes it is not. With this filter you can more
easily watch the Great Red Spot move across the face of
Jupiter.
Notes and Discussion
Keep the plastic case! Store the filter in the case between
observing sessions in the case to keep it dust free. Dust is
the enemy of contrast (the ability to discern detail) when you
are trying to observe fine details on Jupiter.
Use an Orion cleaning kit (such as Orion part number
5832) or clean compressed air to keep the surface of your
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