Sky & Telescope - July 2024 - 56
JULY 2024 OBSERVING
Suburban Stargazer
42
17h 20m
+48°
6229
+46°
52
3
4
5
6
7
8
9
17h 10m
17h 00m
16h 50m
16h 40m
16h 30m
southwest. The guardians are handy
for re-focusing different eyepieces.
My patient use of averted vision and
magnifications between 93× and 108×
teases out 12th-magnitude flecks of
light across the cluster, turning it into a
grainy sphere. Not bad for a small scope.
The 10-inch does way better. At 48×,
+44°
M92
+42°
HERCULES
σ
M13 grows smoothly brighter from the
edge to the middle. An eyepiece yielding
64× resolves the surrounding halo into
stars; doubling to 128× adds numerous
pinpoints throughout the interior.
At 169× to 218×, the glittering sphere
displays irregular clumps of stars separated
by narrow voids. The patchy effect
becomes stronger with increased magnification.
And to my eye, several long
chains of stars curve southwestward, in
the general direction of the 7.3-magnitude
guardian.
Bonus time: Three double stars lie
+40°
η
+38°
ρ
+36°
cr
69
6207
π
Σ2101
Σ2104
M13
Σ2097
W
just southeast of M13. Struve (Σ) 2104
has 7.5- and 8.8-magnitude components
5.7″ apart. Less than 40′ west of
that duo is Σ2101, which offers 7.5- and
9.4-magnitude stars spanning 4.1″. Both
tandems resolve at around 100×. The
third binary, Σ2097, stands 14′ northwest
of Σ2101. This one is tough. The
9.4- and 9.6-magnitude components,
separated by only 1.9″, barely split in my
10-inch at 169×. The dim dots are too
tight for my smaller scope.
pGLOBULARS OF HERCULES M13 and M92 are both well-known globular star clusters, but try
also for NGC 6229, a diminutive globular in the northwestern part of the constellation. And don't
miss the three binary stars located just southeast of M13.
marked by 2.8-magnitude Zeta (ζ) at
the Keystone's southwest corner, and
3.5-magnitude Eta (η) Herculis on
the northwest corner. M13 is found
two-thirds of the way from Zeta to Eta.
Glowing at magnitude 5.8 and 20′ in
diameter, you should see the globular
readily in your finderscope.
M13 is a cosmic hive of several hundred
thousand ancient suns. Fabulous.
But our ability to resolve a globular into
stars depends on both the size of your
scope and the luminosity of the bright56
JULY 2024 * SKY & TELESCOPE
est cluster members. The leading lights
of M13 shine at magnitude 11.9, and
with good sky conditions, a 4-inch telescope
can detect stars down to magnitude
12.7. My sky conditions aren't even
close to good, but let's see what I can do.
In the 4¼-inch reflector at 27×, M13
is a diffuse sphere with a broad, bright
middle. As shown in the photo on page
55, the cluster is flanked by two guardians
- a 6.8-magnitude orange star 15′
to the east and a 7.3-magnitude white
star a similar distance to the southMidsize
Marvel
M13's less famous cousin lies almost
10° northeastward. M92 is w-a-a-a-y
up there. Observers near the latitude
of Denver, Colorado, can watch M92
climb to a point just north of the
zenith. From my home at around 49°
North, I have to crane my neck to sight
M13 - M92 is even worse!
Get ready for one big star-hop. M92
is located roughly two-thirds of the way
from Eta Herculis to 3.8-magnitude
Iota (ι), a lonely light in northeastern
Hercules. Eta and Iota are about 12°
apart - too widely spaced to fit in a
finderscope field. No problem. I place
Eta in my finder, then shift northeastward
until Iota swims into view. There's
no other star as bright as Iota to distract
me along the way. M92 is less than 5°
Star magnitudes
Sky & Telescope - July 2024
Table of Contents for the Digital Edition of Sky & Telescope - July 2024
Contents
Sky & Telescope - July 2024 - Cover1
Sky & Telescope - July 2024 - Cover2
Sky & Telescope - July 2024 - 1
Sky & Telescope - July 2024 - Contents
Sky & Telescope - July 2024 - 3
Sky & Telescope - July 2024 - 4
Sky & Telescope - July 2024 - 5
Sky & Telescope - July 2024 - 6
Sky & Telescope - July 2024 - 7
Sky & Telescope - July 2024 - 8
Sky & Telescope - July 2024 - 9
Sky & Telescope - July 2024 - 10
Sky & Telescope - July 2024 - 11
Sky & Telescope - July 2024 - 12
Sky & Telescope - July 2024 - 13
Sky & Telescope - July 2024 - 14
Sky & Telescope - July 2024 - 15
Sky & Telescope - July 2024 - 16
Sky & Telescope - July 2024 - 17
Sky & Telescope - July 2024 - 18
Sky & Telescope - July 2024 - 19
Sky & Telescope - July 2024 - 20
Sky & Telescope - July 2024 - 21
Sky & Telescope - July 2024 - 22
Sky & Telescope - July 2024 - 23
Sky & Telescope - July 2024 - 24
Sky & Telescope - July 2024 - 25
Sky & Telescope - July 2024 - 26
Sky & Telescope - July 2024 - 27
Sky & Telescope - July 2024 - 28
Sky & Telescope - July 2024 - 29
Sky & Telescope - July 2024 - 30
Sky & Telescope - July 2024 - 31
Sky & Telescope - July 2024 - 32
Sky & Telescope - July 2024 - 33
Sky & Telescope - July 2024 - 34
Sky & Telescope - July 2024 - 35
Sky & Telescope - July 2024 - 36
Sky & Telescope - July 2024 - 37
Sky & Telescope - July 2024 - 38
Sky & Telescope - July 2024 - 39
Sky & Telescope - July 2024 - 40
Sky & Telescope - July 2024 - 41
Sky & Telescope - July 2024 - 42
Sky & Telescope - July 2024 - 43
Sky & Telescope - July 2024 - 44
Sky & Telescope - July 2024 - 45
Sky & Telescope - July 2024 - 46
Sky & Telescope - July 2024 - 47
Sky & Telescope - July 2024 - 48
Sky & Telescope - July 2024 - 49
Sky & Telescope - July 2024 - 50
Sky & Telescope - July 2024 - 51
Sky & Telescope - July 2024 - 52
Sky & Telescope - July 2024 - 53
Sky & Telescope - July 2024 - 54
Sky & Telescope - July 2024 - 55
Sky & Telescope - July 2024 - 56
Sky & Telescope - July 2024 - 57
Sky & Telescope - July 2024 - 58
Sky & Telescope - July 2024 - 59
Sky & Telescope - July 2024 - 60
Sky & Telescope - July 2024 - 61
Sky & Telescope - July 2024 - 62
Sky & Telescope - July 2024 - 63
Sky & Telescope - July 2024 - 64
Sky & Telescope - July 2024 - 65
Sky & Telescope - July 2024 - 66
Sky & Telescope - July 2024 - 67
Sky & Telescope - July 2024 - 68
Sky & Telescope - July 2024 - 69
Sky & Telescope - July 2024 - 70
Sky & Telescope - July 2024 - 71
Sky & Telescope - July 2024 - 72
Sky & Telescope - July 2024 - 73
Sky & Telescope - July 2024 - 74
Sky & Telescope - July 2024 - 75
Sky & Telescope - July 2024 - 76
Sky & Telescope - July 2024 - 77
Sky & Telescope - July 2024 - 78
Sky & Telescope - July 2024 - 79
Sky & Telescope - July 2024 - 80
Sky & Telescope - July 2024 - 81
Sky & Telescope - July 2024 - 82
Sky & Telescope - July 2024 - 83
Sky & Telescope - July 2024 - 84
Sky & Telescope - July 2024 - Cover3
Sky & Telescope - July 2024 - Cover4
https://www.nxtbook.com/nxtbooks/aas/st_202410
https://www.nxtbook.com/nxtbooks/aas/st_202409
https://www.nxtbook.com/nxtbooks/aas/st_202408
https://www.nxtbook.com/nxtbooks/aas/st_202407
https://www.nxtbook.com/nxtbooks/aas/st_202406
https://www.nxtbook.com/nxtbooks/aas/st_202405
https://www.nxtbook.com/nxtbooks/aas/st_202404_qr
https://www.nxtbook.com/nxtbooks/aas/st_202404
https://www.nxtbook.com/nxtbooks/aas/st_202403
https://www.nxtbook.com/nxtbooks/aas/st_202402
https://www.nxtbook.com/nxtbooks/aas/st_202401_aus
https://www.nxtbook.com/nxtbooks/aas/st_202401
https://www.nxtbook.com/nxtbooks/aas/st_202312_aus
https://www.nxtbook.com/nxtbooks/aas/st_202312
https://www.nxtbook.com/nxtbooks/aas/st_202311
https://www.nxtbook.com/nxtbooks/aas/st_202310
https://www.nxtbook.com/nxtbooks/aas/st_202309
https://www.nxtbook.com/nxtbooks/aas/st_202308
https://www.nxtbook.com/nxtbooks/aas/st_202307
https://www.nxtbook.com/nxtbooks/aas/st_202306
https://www.nxtbook.com/nxtbooks/aas/st_202305
https://www.nxtbook.com/nxtbooks/aas/st_202304
https://www.nxtbook.com/nxtbooks/aas/st_202304_qr
https://www.nxtbook.com/nxtbooks/aas/st_202303
https://www.nxtbook.com/nxtbooks/aas/st_202302
https://www.nxtbook.com/nxtbooks/aas/st_202301
https://www.nxtbook.com/nxtbooks/aas/st_202212
https://www.nxtbook.com/nxtbooks/aas/st_202211
https://www.nxtbook.com/nxtbooks/aas/st_202210
https://www.nxtbook.com/nxtbooks/aas/st_202209
https://www.nxtbook.com/nxtbooks/aas/st_202208
https://www.nxtbook.com/nxtbooks/aas/st_202207
https://www.nxtbook.com/nxtbooks/aas/st_202206
https://www.nxtbook.com/nxtbooks/aas/st_202205
https://www.nxtbook.com/nxtbooks/aas/st_202204
https://www.nxtbook.com/nxtbooks/aas/st_202203
https://www.nxtbook.com/nxtbooks/aas/st_202202
https://www.nxtbook.com/nxtbooks/aas/st_202201
https://www.nxtbook.com/nxtbooks/aas/st_202112
https://www.nxtbook.com/nxtbooks/aas/st_202111
https://www.nxtbook.com/nxtbooks/aas/st_202110
https://www.nxtbook.com/nxtbooks/aas/st_202109
https://www.nxtbook.com/nxtbooks/aas/st_202108
https://www.nxtbook.com/nxtbooks/aas/st_202107
https://www.nxtbook.com/nxtbooks/aas/st_202106
https://www.nxtbook.com/nxtbooks/aas/st_202105
https://www.nxtbook.com/nxtbooks/aas/st_202104
https://www.nxtbook.com/nxtbooks/aas/st_202103
https://www.nxtbook.com/nxtbooks/aas/st_202102
https://www.nxtbook.com/nxtbooks/aas/st_202101
https://www.nxtbook.com/nxtbooks/aas/skywatch_2021
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/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