When is the best time to observe IC 1917?

IC 1917 is best observed from October through December, with peak visibility during November when it transits around midnight in the Northern Hemisphere.

Where is IC 1917 located in the sky?

IC 1917 lies in the constellation Horologium at right ascension 03h 22m and declination -53° 11′.

What telescope do I need to see IC 1917?

At magnitude 15.3, IC 1917 is a challenging target that needs at least an 8-inch (200 mm) telescope and dark skies.

IC 1917 — Galaxy in Horologium

Galaxy Fair (20/100)

Lenticular

Magnitude 15.3^m Galaxy Horologium (Hor) Visible

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1Properties

Magnitude 15.32

Angular Size 0.8′ × 0.5′

Position Angle 12°

Galaxy Type Lenticular (S0-a)

Description

E ns

Position & Identifiers

RA 03h 22m 12.4s

Dec -53° 11' 06.7"

Constellation Horologium (Hor)

Catalog IC 1917

2How easy to spot?

Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	V. hard	V. hard	V. hard
150 mm Newton 150mm Newt.	V. hard	V. hard	V. hard
Celestron C8 (203 mm SCT) C8 203mm	V. hard+	V. hard	V. hard

Easy Medium Hard Very hard Impossible

Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs

Medium on Seestar S50

3Visibility

Set a location in User Settings to see visibility data.

Best season Oct – Dec (peak: Nov)

4 Eyepiece View

Telescope Eyepiece

125x TFOV: 0.4° Lim. mag: 13.6

Seeing Bortle

IC 1917 · 0.8′×0.5′ · N up, E left

5 Best Magnification

Explore

6 Surface Brightness

7 Morphology Decoder

8 Inclination & True Shape

9 Redshift

10 Size Comparator

Nearby in the Sky

Other targets within a few degrees — pan your scope a little and keep exploring.

Visibility scores assume a 150 mm Newton at Bortle 4.

NGC 1249

Hard+

Barred spiral galaxy

Galaxy mag 12.0 1.8° Horologium

IC 1954

Hard+

Barred spiral galaxy

Galaxy mag 12.0 1.9° Horologium

NGC 1261

Easy

Globular cluster — dense ball of ancient stars

Globular Cluster mag 8.4 2.5° Horologium

TW Hor

Hard+

Semi-regular variable, range 5.5–6.0

Variable Star mag 5.74 4.4° Horologium

IC 2000

Medium

Edge-on galaxy

Galaxy mag 12.38 6.0° Horologium

NGC 1515

Medium+

Edge-on galaxy

Galaxy mag 11.0 6.3° Dorado

Zeta Ret

HIP 15371; Zeta2 Reticuli

Easy

Easy double, sep 309.1″

Double Star mag 5.24 9.3° Reticulum

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