Sky & Telescope - June 2020 - 54

JUNE 2020 OBSERVING
Deep-Sky Wonders by Sue French

T

The First
Plowman
Boötes is home to one
globular cluster and many
great galaxies.
And next Boötes comes, whose order'd Beams
Present a Figure driving on his Teams.
- Marcus Manilius, Astronomica

Star magnitudes
3 4 5 6 7 8

he name Boötes is often said to
come from a Greek term meaning
"ox driver." According to some tales,
Boötes invented the ox-drawn plow to
make the cultivation of crops easier.
Proud of her son's creation, the goddess Ceres had Boötes placed among the
stars. We can also see his creation in the
nearby asterism of the Big Dipper, which
is called the Plough in the British Isles.
Have you ever wondered how to pronounce Boötes? One accepted pronunciation is bo-OH-teez. For an expanded
guide to the constellations and their
pronunciations, visit https://is.gd/
constellations.

5714
38

λ

+45°

5383

β

+40°

5371

UGC
9242

γ

5395
5557
5529

+35°

HD 125351

δ

BOÖTES

Kangaroo

ρ

+30°

σ

5466
11

Izar

15h 00m

54

JUNE 2 02 0 * SK Y & TELESCOPE

ε

14h 30m

14h 00m

We'll begin at Delta (δ) Boötis, a
spacious double star whose components
are widely parted by my 105-mm (4.1inch) refractor at 17×. The deep-yellow
primary is a giant star with a spectral
type of G8, and the pale-yellow star following it across the sky is similar to our
Sun. Despite the gulf between them,
these stars form a true pair about 122
light-years away from us. Their angular
separation on the sky tells us that they
must be separated in space by at least 10
times the average Sun-Pluto distance.
Canadian amateur Dave Johns told
me about a cute asterism he found 3.1°
west of Delta. His Kangaroo spans
1.7° from nose to tail and makes a nice
target for big binoculars or a small,
wide-field telescope. My 18×50 imagestabilized binoculars show enough stars
to see his shape, with the Kangaroo
boinging his way east. My 105-mm
scope at 17× nicely displays the 21 stars
(magnitudes 7 to 11) that make up his
outline. The Kangaroo's brightest star
joins his foreleg to his body and shines
with a golden hue.
Our next stop is the lovely double
star Epsilon (ε) Boötis. It's commonly
known as Izar, an Arabic word meaning girdle or loincloth, denoting the
star's position in its constellation figure.
William Herschel discovered the pair
in 1779, describing it as "a very beautiful object." He called the brighter star
"reddish" and the fainter one "blue, or
rather a faint lilac." Friedrich Georg
Wilhelm von Struve bestowed the name
Pulcherrima (Most Beautiful) on this
double, calling its stars "very yellow"
and "very blue."
To celebrate 20 years of Sue French's
stellar contributions to Sky & Telescope, we will be sharing the best of
her columns in the coming months.
We have updated values to current
measurements when appropriate.


https://www.is.gd/constellations.com https://www.is.gd/constellations.com

Sky & Telescope - June 2020

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

Contents
Sky & Telescope - June 2020 - Cover1
Sky & Telescope - June 2020 - Cover2
Sky & Telescope - June 2020 - 1
Sky & Telescope - June 2020 - Contents
Sky & Telescope - June 2020 - 3
Sky & Telescope - June 2020 - 4
Sky & Telescope - June 2020 - 5
Sky & Telescope - June 2020 - 6
Sky & Telescope - June 2020 - 7
Sky & Telescope - June 2020 - 8
Sky & Telescope - June 2020 - 9
Sky & Telescope - June 2020 - 10
Sky & Telescope - June 2020 - 11
Sky & Telescope - June 2020 - 12
Sky & Telescope - June 2020 - 13
Sky & Telescope - June 2020 - 14
Sky & Telescope - June 2020 - 15
Sky & Telescope - June 2020 - 16
Sky & Telescope - June 2020 - 17
Sky & Telescope - June 2020 - 18
Sky & Telescope - June 2020 - 19
Sky & Telescope - June 2020 - 20
Sky & Telescope - June 2020 - 21
Sky & Telescope - June 2020 - 22
Sky & Telescope - June 2020 - 23
Sky & Telescope - June 2020 - 24
Sky & Telescope - June 2020 - 25
Sky & Telescope - June 2020 - 26
Sky & Telescope - June 2020 - 27
Sky & Telescope - June 2020 - 28
Sky & Telescope - June 2020 - 29
Sky & Telescope - June 2020 - 30
Sky & Telescope - June 2020 - 31
Sky & Telescope - June 2020 - 32
Sky & Telescope - June 2020 - 33
Sky & Telescope - June 2020 - 34
Sky & Telescope - June 2020 - 35
Sky & Telescope - June 2020 - 36
Sky & Telescope - June 2020 - 37
Sky & Telescope - June 2020 - 38
Sky & Telescope - June 2020 - 39
Sky & Telescope - June 2020 - 40
Sky & Telescope - June 2020 - 41
Sky & Telescope - June 2020 - 42
Sky & Telescope - June 2020 - 43
Sky & Telescope - June 2020 - 44
Sky & Telescope - June 2020 - 45
Sky & Telescope - June 2020 - 46
Sky & Telescope - June 2020 - 47
Sky & Telescope - June 2020 - 48
Sky & Telescope - June 2020 - 49
Sky & Telescope - June 2020 - 50
Sky & Telescope - June 2020 - 51
Sky & Telescope - June 2020 - 52
Sky & Telescope - June 2020 - 53
Sky & Telescope - June 2020 - 54
Sky & Telescope - June 2020 - 55
Sky & Telescope - June 2020 - 56
Sky & Telescope - June 2020 - 57
Sky & Telescope - June 2020 - 58
Sky & Telescope - June 2020 - 59
Sky & Telescope - June 2020 - 60
Sky & Telescope - June 2020 - 61
Sky & Telescope - June 2020 - 62
Sky & Telescope - June 2020 - 63
Sky & Telescope - June 2020 - 64
Sky & Telescope - June 2020 - 65
Sky & Telescope - June 2020 - 66
Sky & Telescope - June 2020 - 67
Sky & Telescope - June 2020 - 68
Sky & Telescope - June 2020 - 69
Sky & Telescope - June 2020 - 70
Sky & Telescope - June 2020 - 71
Sky & Telescope - June 2020 - 72
Sky & Telescope - June 2020 - 73
Sky & Telescope - June 2020 - 74
Sky & Telescope - June 2020 - 75
Sky & Telescope - June 2020 - 76
Sky & Telescope - June 2020 - 77
Sky & Telescope - June 2020 - 78
Sky & Telescope - June 2020 - 79
Sky & Telescope - June 2020 - 80
Sky & Telescope - June 2020 - 81
Sky & Telescope - June 2020 - 82
Sky & Telescope - June 2020 - 83
Sky & Telescope - June 2020 - 84
Sky & Telescope - June 2020 - Cover3
Sky & Telescope - June 2020 - Cover4
https://www.nxtbook.com/nxtbooks/aas/st_202012
https://www.nxtbook.com/nxtbooks/aas/st_202011
https://www.nxtbook.com/nxtbooks/aas/st_202010
https://www.nxtbook.com/nxtbooks/aas/st_202009
https://www.nxtbook.com/nxtbooks/aas/st_202008
https://www.nxtbook.com/nxtbooks/aas/st_202007
https://www.nxtbook.com/nxtbooks/aas/st_202006
https://www.nxtbook.com/nxtbooks/aas/st_202005
https://www.nxtbook.com/nxtbooks/aas/st_202004
https://www.nxtbook.com/nxtbooks/aas/st_202003
https://www.nxtbook.com/nxtbooks/aas/st_202002
https://www.nxtbook.com/nxtbooks/aas/st_202001
https://www.nxtbook.com/nxtbooks/aas/st_201912
https://www.nxtbook.com/nxtbooks/aas/st_201911
https://www.nxtbook.com/nxtbooks/aas/st_201910
https://www.nxtbook.com/nxtbooks/aas/st_201909
https://www.nxtbook.com/nxtbooks/aas/st_201908
https://www.nxtbook.com/nxtbooks/aas/st_201907
https://www.nxtbook.com/nxtbooks/aas/st_201906
https://www.nxtbook.com/nxtbooks/aas/st_201905
https://www.nxtbook.com/nxtbooks/aas/st_201904
https://www.nxtbook.com/nxtbooks/aas/st_201903
https://www.nxtbook.com/nxtbooks/aas/st_201902
https://www.nxtbook.com/nxtbooks/aas/st_201901
https://www.nxtbook.com/nxtbooks/aas/st_201812
https://www.nxtbook.com/nxtbooks/aas/st_201811
https://www.nxtbook.com/nxtbooks/aas/st_201810
https://www.nxtbook.com/nxtbooks/aas/st_201809
https://www.nxtbook.com/nxtbooks/aas/st_201808
https://www.nxtbook.com/nxtbooks/aas/st_201807
https://www.nxtbook.com/nxtbooks/aas/st_201806
https://www.nxtbook.com/nxtbooks/aas/st_201805
https://www.nxtbook.com/nxtbooks/aas/st_201804
https://www.nxtbook.com/nxtbooks/aas/st_201803
https://www.nxtbook.com/nxtbooks/aas/st_201802
https://www.nxtbook.com/nxtbooks/aas/st_201801
https://www.nxtbook.com/nxtbooks/aas/st_201712
https://www.nxtbook.com/nxtbooks/aas/st_201711
https://www.nxtbook.com/nxtbooks/aas/st_201710
https://www.nxtbook.com/nxtbooks/aas/st_201709
https://www.nxtbook.com/nxtbooks/aas/st_201708
https://www.nxtbook.com/nxtbooks/aas/st_201707
https://www.nxtbook.com/nxtbooks/aas/st_201706
https://www.nxtbook.com/nxtbooks/aas/st_201705
https://www.nxtbook.com/nxtbooks/aas/st_201704
https://www.nxtbook.com/nxtbooks/aas/st_201703
https://www.nxtbook.com/nxtbooks/aas/st_201702
https://www.nxtbook.com/nxtbooks/aas/st_201701
https://www.nxtbook.com/nxtbooks/aas/st_201612
https://www.nxtbook.com/nxtbooks/aas/st_201611
https://www.nxtbook.com/nxtbooks/newtrack/st_201612
https://www.nxtbook.com/nxtbooks/aas/st_201610
https://www.nxtbook.com/nxtbooks/aas/st_201609
https://www.nxtbook.com/nxtbooks/aas/st_201608
https://www.nxtbook.com/nxtbooks/aas/st_201607
https://www.nxtbook.com/nxtbooks/aas/st_201606
https://www.nxtbook.com/nxtbooks/aas/st_201605
https://www.nxtbook.com/nxtbooks/aas/st_201604
https://www.nxtbook.com/nxtbooks/aas/st_201603
https://www.nxtbook.com/nxtbooks/aas/st_201602
https://www.nxtbook.com/nxtbooks/aas/st_201601
https://www.nxtbook.com/nxtbooks/aas/st_201512
https://www.nxtbook.com/nxtbooks/aas/st_201511
https://www.nxtbook.com/nxtbooks/aas/st_201510
https://www.nxtbook.com/nxtbooks/aas/st_201509
https://www.nxtbook.com/nxtbooks/aas/st_201508
https://www.nxtbook.com/nxtbooks/aas/st_201507
https://www.nxtbook.com/nxtbooks/aas/st_201506
https://www.nxtbook.com/nxtbooks/aas/st_201505
https://www.nxtbook.com/nxtbooks/aas/st_201504
https://www.nxtbook.com/nxtbooks/aas/st_201503
https://www.nxtbook.com/nxtbooks/aas/st_201502
https://www.nxtbook.com/nxtbooks/aas/st_201501
https://www.nxtbook.com/nxtbooks/aas/st_201412
https://www.nxtbook.com/nxtbooks/aas/st_201411
https://www.nxtbook.com/nxtbooks/aas/st_201410
https://www.nxtbook.com/nxtbooks/aas/st_201409
https://www.nxtbook.com/nxtbooks/aas/st_201408
https://www.nxtbook.com/nxtbooks/aas/st_201407
https://www.nxtbook.com/nxtbooks/aas/st_201406
https://www.nxtbook.com/nxtbooks/aas/st_mars
https://www.nxtbook.com/nxtbooks/aas/st_201405
https://www.nxtbook.com/nxtbooks/aas/st_201404
https://www.nxtbook.com/nxtbooks/aas/st_201403
https://www.nxtbook.com/nxtbooks/aas/st_201402
https://www.nxtbook.com/nxtbooks/aas/st_201401
https://www.nxtbook.com/nxtbooks/aas/st_201312
https://www.nxtbook.com/nxtbooks/aas/st_201311
https://www.nxtbook.com/nxtbooks/aas/st_201310
https://www.nxtbook.com/nxtbooks/aas/st_201309
https://www.nxtbook.com/nxtbooks/aas/st_201308
https://www.nxtbook.com/nxtbooks/aas/st_201307
https://www.nxtbook.com/nxtbooks/aas/st_201306
https://www.nxtbook.com/nxtbooks/aas/st_201305
https://www.nxtbook.com/nxtbooks/aas/st_201304
https://www.nxtbook.com/nxtbooks/aas/st_201303
https://www.nxtbook.com/nxtbooks/aas/st_201302
https://www.nxtbook.com/nxtbooks/aas/st_201301
https://www.nxtbook.com/nxtbooks/aas/st_201212
https://www.nxtbook.com/nxtbooks/aas/st_201211
https://www.nxtbook.com/nxtbooks/aas/st_201210
https://www.nxtbook.com/nxtbooks/aas/st_201209
https://www.nxtbook.com/nxtbooks/aas/st_201208
https://www.nxtbook.com/nxtbooks/aas/st_201207
https://www.nxtbook.com/nxtbooks/aas/st_201206
https://www.nxtbook.com/nxtbooks/aas/st_201205
https://www.nxtbook.com/nxtbooks/aas/st_201204
https://www.nxtbook.com/nxtbooks/aas/st_201203
https://www.nxtbook.com/nxtbooks/aas/st_201202
https://www.nxtbook.com/nxtbooks/aas/st_201201
https://www.nxtbook.com/nxtbooks/aas/st_201112
https://www.nxtbook.com/nxtbooks/aas/st_201111
https://www.nxtbook.com/nxtbooks/aas/st_201110
https://www.nxtbook.com/nxtbooks/aas/st_201109
https://www.nxtbook.com/nxtbooks/aas/st_201108
https://www.nxtbook.com/nxtbooks/aas/st_201107
https://www.nxtbook.com/nxtbooks/aas/st_201106
https://www.nxtbook.com/nxtbooks/aas/st_201105
https://www.nxtbook.com/nxtbooks/aas/st_201104
https://www.nxtbook.com/nxtbooks/aas/st_201103
https://www.nxtbook.com/nxtbooks/aas/st_201102
https://www.nxtbook.com/nxtbooks/aas/st_201101
https://www.nxtbook.com/nxtbooks/aas/st_201012
https://www.nxtbook.com/nxtbooks/aas/st_201011
https://www.nxtbook.com/nxtbooks/aas/st_201010
https://www.nxtbook.com/nxtbooks/aas/st_201009
https://www.nxtbook.com/nxtbooks/aas/st_201008
https://www.nxtbook.com/nxtbooks/aas/st_201007
https://www.nxtbook.com/nxtbooks/aas/st_201006
https://www.nxtbook.com/nxtbooks/aas/st_201005
https://www.nxtbook.com/nxtbooks/aas/st_201004
https://www.nxtbook.com/nxtbooks/aas/st_201003
https://www.nxtbook.com/nxtbooks/aas/st_201002
https://www.nxtbook.com/nxtbooks/aas/st_201001
https://www.nxtbookmedia.com