This chart ranks the largest of the 88 official constellations by the area of sky they cover, in square degrees, as defined by the International Astronomical Union. Hydra, the water snake, is the largest.

About: Largest Constellations by Area

Overview of the data behind this chart

AI Insight

Hydra, the water snake, is the largest constellation, sprawling across 1,303 square degrees, more than 3% of the entire sky. It narrowly edges out Virgo (1,294) and Ursa Major (1,280), home of the Big Dipper. The top five, completed by Cetus and Hercules, each exceed 1,200 square degrees. These figures come from the International Astronomical Union, which in 1930 divided the sky into 88 constellations with precise boundaries, so every point in the sky belongs to exactly one. Size here reflects the area of those official boundaries, not brightness or star count, which is why a large constellation like Hydra can still be faint and hard to trace. For comparison, the smallest constellation, Crux, covers just 68 square degrees, about nineteen times smaller than Hydra.

Data source: IAU designated constellations by area

Key Findings

Auto-computed highlights from this dataset

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Hydra leads with 1,303 in All Time.

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Average value in All Time: 1,172 · median: 1,182.

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Gap in All Time: Hydra is 1.3× larger than Aquarius.

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Additional Data

Largest Constellations by Area

Data Insights Below

Data Insights

Numbers, trends & sources behind this chart

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Data Points

10 categories · 1 year

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Top Value

1,302.80

Hydra

Area (square degrees) · All Time

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Metrics

Area (square degrees)

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Period

All Time

Single year snapshot

Category Rankings

Area (square degrees) · All Time

#	Category	All Time
🥇	Hydra	1,302.80
🥈	Virgo	1,294.40
🥉	Ursa Major	1,279.70
4	Cetus	1,231.40
5	Hercules	1,225.10
6	Eridanus	1,137.90
7	Pegasus	1,120.80
8	Draco	1,083
9	Centaurus	1,060.40
10	Aquarius	979.90

Statistical Summary — Area (square degrees) · All Time

1,302.80

Maximum

979.90

Minimum

1,172

Average

1,182

Median

What This Data Shows

Auto-generated trend summaries per category

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Hydra

Recorded 1,302.80 Area (square degrees) in All Time.

Source

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Virgo

Recorded 1,294.40 Area (square degrees) in All Time.

Source

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Ursa Major

Recorded 1,279.70 Area (square degrees) in All Time.

Source

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Cetus

Recorded 1,231.40 Area (square degrees) in All Time.

Source

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Hercules

Recorded 1,225.10 Area (square degrees) in All Time.

Source

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Eridanus

Recorded 1,137.90 Area (square degrees) in All Time.

Source

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Pegasus

Recorded 1,120.80 Area (square degrees) in All Time.

Source

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Draco

Recorded 1,083 Area (square degrees) in All Time.

Source

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Centaurus

Recorded 1,060.40 Area (square degrees) in All Time.

Source

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Aquarius

Recorded 979.90 Area (square degrees) in All Time.

Source

Full Data Table

10 records across 1 year

10 sourced

Category	Metric	All Time
Hydra	Area (square degrees)	1,302.80
Virgo	Area (square degrees)	1,294.40
Ursa Major	Area (square degrees)	1,279.70
Cetus	Area (square degrees)	1,231.40
Hercules	Area (square degrees)	1,225.10
Eridanus	Area (square degrees)	1,137.90
Pegasus	Area (square degrees)	1,120.80
Draco	Area (square degrees)	1,083
Centaurus	Area (square degrees)	1,060.40
Aquarius	Area (square degrees)	979.90