Sky & Telescope - January 2021 - 25

NGC 1684

NGC 1678

NGC 1685
MCG -01-13-33

NGC 1683

MCG -01-13-22
NGC 1682

NGC 1684
MCG -01-13-17
HD 31297
65

HD 31021
76

The 12th-magnitude elliptical NGC 1684
lies just across the border in Orion, some
1.7° east of Mu (μ) Eridani. It forms a pair
with the smaller elliptical NGC 1682 a
little less than 3′ to its west. NGC 1682 is
fainter, but its stellar core makes it stand
out. NGC 1685, about 9½′ to the north,
and NGC 1683, a little less than 6′ to the
northwest, complete the inner part of the
group. Both are faint and may be quite difficult to detect.
NGC 1678, a 13.2-magnitude spiral with an 11.7-magnitude star just off
its western edge, lies about ½° to the
north-northwest of this inner group. Four
more galaxies in the field are within range
of larger scopes. Along a line extending nearly ½° west of NGC 1684 we first
come to MCG -01-13-22 seen edge on
and then MCG -01-13-17, which is also
elongated. Turning south of NGC 1684
a little more than 27½′ brings you to the
spiral, MCG -01-13-30, while the barred
spiral MCG -01-13-33 is 13′ east-northeast of the inner group.

MCG -01-13-30

+50°

θ

NGC 2274

2340

ι

UMA
κ

Star magnitudes

β

+40°

AURIGA
LYNX
α

+30°

κ

β
2487

λ

γ

+20°
2749

2795

2563
M44

δ
+10°

α

2389

α

CANCER
ι

LEO

τ

θ

υ

ε

GEMINI
κ

δ

μ

ζ

ν
γ

ζ

λ
ξ

M67

β

0
1
2
3
4
5

2274

2513

H Y A 9h

About 1.2° southwest of Theta (θ) Geminorum, NGC 2274
(not shown) outshines its close neighbor NGC 2275 by more
than one magnitude. American astronomer Harold Corwin
notes that the two galaxies are reversed in the Morphological
Catalogue of Galaxies. The NGC and the Uppsala General
Catalogue correctly identify NGC 2274 as the southern
and brighter of the two. About 45′ to the east is a group of
five NGC galaxies arranged in an arc. The three brightest,
NGC 2289, NGC 2290, and NGC 2291, are of similar
magnitude, although NGC 2289, with its greater surface
brightness, sticks out more.

CANIS
β
MINOR
8h
Procyon
α

7h

Catalog Abbreviations
Astronomical catalogs abound, but they often have
rather long and unwieldy titles. Hence, observers
revert to convenient abbreviations. They'll refer
to "NGC" objects listed in the New General
Catalogue, and the catalog itself is often simply
reduced to "the NGC." The same goes for the
Index Catalogue (IC), the Morphological Catalogue
of Galaxies (MCG), and the Uppsala General
Catalogue (UGC), among many others.

sk yandtelescope.org * JANUARY 2 021

25


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Sky & Telescope - January 2021

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