Sky and Telescope - November 2017 - 66

S&T Test Report

click on the objects shown to select
them as Go To targets. There is, however, a good search function for deepsky targets and the like. Objects selected
from the search results are then shown
on the star chart, and you can slew to
them. As such, anyone who knows what
they want to observe can use Celestron
PWI to point the CGX at their objects of
interest. You can also slew to any celestial coordinates that you input.
The software has an extremely nice
and easy-to-use method for building a
pointing model that improves the Go
To accuracy. You simply select any star
shown on the map, center it in the telescope's field of view, and click one button to add it to the model. Do this for
half a dozen stars on both sides of the
meridian, and you likely have a model
with pointing accuracy much better
than 1 arcminute over the whole sky.
You can then save this model and reload
it for future observing sessions.
66

N O V E M B E R 2 0 17 * S K Y & T E L E S C O P E

Smooth Sailing?
I had very few problems while testing the CGX. One bump in the road
occurred while loading the Celestron
PWI software, but it very likely arose
because of software previously installed
on my laptop computer. The only mount
issue worthy of mention occurred when
I was running some tests by observing
stars in a noontime sky on a very hot
day (ambient temperature near 100°F)
and after the mount had been baking
in direct sunlight for more than an
hour. A command to home the scope
sent the mount to the correct position
for the right-ascension axis, but not
declination. A few more tries and the
right-ascension homing failed as well.
I shut the CGX down, only to find that
everything was back to normal when I
resumed testing that evening. The homing never failed after that day, leading
me to suspect that extreme heat was
the issue. Not surprising given that

p This composite image of the International
Space Station crossing the Sun's disk last June
21st might not have happened were it not for
the CGX's quick startup capability and the Sun
being included in its list of solar system targets.
A last-minute change in the weather gave the
author barely 5 minutes to open his observatory and set up for a burst of five exposures
with a Nikon D700 DSLR attached to an 85-mm
refractor operating at f/14.

parts of the mount in direct sunlight
were almost too hot to touch when the
problem occurred.
Small issues aside, the CGX fully
lived up to my expectations. Indeed, it
proved to be the nicest Celestron mount
I've yet tested. And it also delivered on
its under-promoted potential for remote
observing at an unprecedented low cost.
It's a mid-weight German equatorial
that I can strongly recommend.
■ DENNIS DI CICCO has covered
astronomical equipment in the pages of
Sky & Telescope for more than 40 years.



Sky and Telescope - November 2017

Table of Contents for the Digital Edition of Sky and Telescope - November 2017

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Sky and Telescope - November 2017 - 1
Sky and Telescope - November 2017 - Contents
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