Sky & Telescope - December 2020 - 75

S&T's Pocket Sky Atlases
NEW 2nd Editions

S Mark Yonker pours the slip over the hexagonal honeycomb backing for a 24-inch mirror.

nebulae. Mark is a deep-sky observer,
so he kept using the mirror for several
years, partly for the novelty of it and
partly because it was perfectly adequate
for his purposes.
The coating deteriorated over time -
bubbles in the glaze made it look like it
was slightly under-polished - so Mark
recently had it recoated. Unfortunately,
the ferric chloride used to strip off the
old coating also attacked the glaze,
which affected the mirror's figure. Now
its limit is about six arcseconds.
So the mirror wasn't a complete
success, but it certainly wasn't a failure,
either. Given that this was the first one
Mark did, there's clearly plenty of room
for refinement of the process.
That's where you come in. Health
issues and other projects have prevented
Mark from taking this concept further,
but he and I agree that it's a concept
worth pursuing. There are plenty of
naysayers out there who will tell you
that ceramic mirrors won't work, but
I've looked through Mark's scope and
beg to differ. This scope performs a lot
better than Isaac Newton's ever did
- and just look where that path led.
Someone needs to pick up this loose ball
and run with it.
Interested parties may contact Mark
via me at j.oltion@gmail.com.

■ Contributing Editor JERRY OLTION
would try this himself, but his project
queue is already years long (the hazard
of writing this column every month).

By popular request, two
special new lists are included in these second editions. One is a table of the
atlas's 53 stars of unusual
reddish hue (also known as
carbon stars), and the charts
where they are found. The
other is a list of 24 nearby
stars, with their distances
in light-years and the charts
showing their locations. All
can easily be spotted in small
telescopes.

These NEW regular and Jumbo versions of our bestselling Pocket Sky
Atlas are identical in content. They have the same 80 main charts and
the same 10 close-up charts, with the Jumbo version being 30% larger.

The choice is yours!

shopatsky.com
sk yandtelescope.org * DECEMBER 2 02 0

75


http://www.shopatsky.com http://www.skyandtelescope.org

Sky & Telescope - December 2020

Table of Contents for the Digital Edition of Sky & Telescope - December 2020

Contents
Sky & Telescope - December 2020 - Cover1
Sky & Telescope - December 2020 - Cover2
Sky & Telescope - December 2020 - 1
Sky & Telescope - December 2020 - Contents
Sky & Telescope - December 2020 - 3
Sky & Telescope - December 2020 - 4
Sky & Telescope - December 2020 - 5
Sky & Telescope - December 2020 - 6
Sky & Telescope - December 2020 - 7
Sky & Telescope - December 2020 - 8
Sky & Telescope - December 2020 - 9
Sky & Telescope - December 2020 - 10
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Sky & Telescope - December 2020 - Cover3
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