NGC 4103

Scientific overview

NGC 4103 is an open cluster in the constellation Crux. It shines at apparent magnitude 7.4 and spans about 7.8 arcminutes of sky.

Difficulty

Small telescope

Recommended equipment

≈ 80–100 mm telescope

Best observed

Spring (S. evening sky)

Best hemisphere

Southern

Guidance follows standard observing practice, derived from the object's real magnitude and position. A dark, moonless sky always helps.

RA / Dec

12.111h / -61.2501°

Hemisphere

Southern

Season

Spring

Object	Type	Mag	Size (′)
Coalsack ClusterC 98 · NGC 4609	Open cluster	6.9	5.4
NGC 4349NGC 4349	Open cluster	7.4	6.3
NGC 4439NGC 4439	Open cluster	8.4	4.5
NGC 4052NGC 4052	Open cluster	8.8	5.1
NGC 4337NGC 4337	Open cluster	8.9	6.6
Herschel's Jewel BoxC 94 · NGC 4755	Open cluster	—	7.8

Facts on this topic will be cited from these primary and reference sources.

OpenNGCOpenNGC (M. Verga) — NGC/IC, Messier, and Caldwell catalogue data
Openly-licensed deep-sky catalogue: object types, positions, magnitudes, sizes, morphology, and cross-identifiers.

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