Smallest Constellations by Area

About This Dataset

This chart ranks the smallest of the 88 official constellations by area, in square degrees, as defined by the International Astronomical Union. Crux, the Southern Cross, is the smallest of all.

✨ AI Insight

Crux, the Southern Cross, is the smallest constellation in the sky at just 68.4 square degrees, yet it is among the most recognisable and appears on several national flags. Equuleus (71.6) and Sagitta (79.9) follow closely, both faint northern star patterns. Despite their small size, several of these compact constellations are famous: Crux for southern-hemisphere navigation, and Corona Borealis and Corona Australis for their distinctive crown-like arcs. The values reflect official IAU boundaries rather than visual prominence, so a small constellation can still contain bright, well-known stars. Crux is roughly nineteen times smaller than the largest constellation, Hydra, illustrating how unevenly the 88 constellations divide the sky, ranging from tiny Crux to sprawling patterns covering more than 1,300 square degrees.

Source: IAU designated constellations by area

Key Findings

Auto-computed highlights from this dataset

🏆

Canis Minor leads with 183 in All Time.

📊

Average value in All Time: 115 · median: 110.

↔️

Gap in All Time: Canis Minor is 2.7× larger than Crux.