Sky & Telescope - November 2024 - 56

Star magnitudes
DSS2
NOVEMBER 2024 OBSERVING
Suburban Stargazer
2h 30m
891
2h 20m
2h 10m
γ
υ
55
τ
+40°
ANDROMEDA
Σ222
+38°
58
2
3
4
5
6
7
8
9
δ
γ
925
7
ε
ANDROMEDA EAST The easternmost part of the constellation Andromeda contains modest
targets for small backyard telescopes under badly light-polluted skies. The author's tour sets off
from the lovely binary star Almach, then zigzags southward to the very large open star cluster
NGC 752.
752
Σ179
Σ I4
+36°
β
TRIANGULUM
+34°
2h 00m
Almach
1h 50m
1h 40m
1h 30m
+42°
ward and headed almost 4° to locate
fainter 59 Andromedae. The star is an
easy double known as Struve 222, or
Σ222. Separated by 16.6″, the 6.1- and
6.7-magnitude suns of Σ222 resolved
instantly in both scopes.
Next, I swung south-southwest 1¼°
degrees to 4.8-magnitude 58 Andromedae,
then shifted two degrees directly
west to my prime target - the large open
cluster NGC 752. But buyer beware:
The stated visual magnitude of 5.7 is a
tad misleading since the cluster's light
is sprinkled across an expansive area
roughly 75′ across. Within that circle
of sky is a loose population of some six
dozen faint stars. The brightest is only
magnitude 7.1, and none of the other
cluster members exceeds magnitude 8.1.
Harrumph. In my decent-quality
finderscope, NGC 752 was an extremely
pale, slightly mottled mist, its dim stars
essentially swamped by my badly lightpolluted
suburban sky. Definitely not a
finder-friendly situation.
Bonus 2
Bonus 5
Bonus 3
Bonus 4
Bonus 1
Sparse Sparkle
Despite the finderscope difficulties,
NGC 752 is a target worth inspecting
in a telescope. The total number of stars
you'll see in the cluster will depend on
your sky conditions, your scope's aperture,
and how big the grouping appears
in your field of view.
I found the ragged limits of NGC
752 difficult to define in my backyard
equipment. The refractor working at
30× revealed a thin scatter of approximately
60 stars. The same wide-angle,
30-mm eyepiece on the reflector delivered
a similar number but in a smaller
field of view. It was actually a very
attractive sight.
And happily, that " attractive sight "
came with bonuses. The bonus bits
have no official names, so I decided to
number them. The most notable feature
is a triangular triple system illuminatHD
11727
56
TAKE FIVE A close look at the thinly
populated cluster NGC 752 reveals at least five
bonus sets of tightly spaced stars. Four of the
five are pairs; the other set (Bonus 1) is a triple
system forming a tight triangle. The brightest
point on the triangle is HD 11885, the most
luminous star in NGC 752.
56 NOVEMBER 2024 * SKY & TELESCOPE

Sky & Telescope - November 2024

Table of Contents for the Digital Edition of Sky & Telescope - November 2024

Contents
Sky & Telescope - November 2024 - Cover1
Sky & Telescope - November 2024 - Cover2
Sky & Telescope - November 2024 - 1
Sky & Telescope - November 2024 - Contents
Sky & Telescope - November 2024 - 3
Sky & Telescope - November 2024 - 4
Sky & Telescope - November 2024 - 5
Sky & Telescope - November 2024 - 6
Sky & Telescope - November 2024 - 7
Sky & Telescope - November 2024 - 8
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