Sky & Telescope - July 2021 - 49

19h 47m

19h 46m

19h 45m

20h 00m

19h 44m

19h 50m

Path

19h 40m
-22°

of Pl
uto

-24°

SAGITTARIUS

US

52
Star magnitudes

-22° 30'

16

24

20

20

24

16

28

12

Sept 1

5

8 Nov 4

9

4
5
6
7
8
9

ω

-26°

SAO 188509

13 17
21 25
29

Path
of Pluto

Oct 3
7
31 27 23 19
15 11
-23° 00'

Z
Terebellum

SAGITTARIUS

SAO 188511

to look because the speck is now part of
a pattern. In my 15-inch reflector, Pluto
stands out well at around 200×. Returning to the field the next clear night to
see if your suspect has shifted position is a good strategy to confirm your
initial sighting. Catching Pluto on the
move is also the method used by Clyde
Tombaugh in 1930 when he discovered
Pluto by methodically examining photographic plates captured on different
nights. Pluto's motion over a 24-hour
span will probably suffice for a positive

identification, especially if the erstwhile
planet happens to pass near a field star.
On July 17th when it's at opposition,
Pluto will be nearly 5 billion kilometers
(3 billion miles) from Earth and crawling west in retrograde motion at the
rate of about 1.4′ per day. That's a distance 2½ times greater than the separation between the component stars of
the famed double Albireo in Cygnus.
Pluto seekers embark on a journey to
an exotic land. With a bit of planning
and steady seeing, your adventure will

take you to remote country visited by
few. Your destination is the Kuiper Belt
- a cold and distant place where you'll
see a globe enrobed in icy nitrogen,
methane, and carbon monoxide.
Your impression of Pluto, like other
difficult targets, is largely about what
you bring to the telescope eyepiece. That
includes knowledge of the subject and
its history. Equally important is the
effort you expend in finding it - all of
which adds to the pleasure of accomplishing the journey.
s k y a n d t e l e s c o p e . o r g * J U LY 2 0 2 1

49


http://www.skyandtelescope.org

Sky & Telescope - July 2021

Table of Contents for the Digital Edition of Sky & Telescope - July 2021

Contents
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Sky & Telescope - July 2021 - 1
Sky & Telescope - July 2021 - Contents
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