Space · Mean-diameter reference · idealized sphere
Ganymede diameter and size comparison
Ganymede has a reference mean diameter of 5,262.4 kilometers. Its disk is larger than Mercury’s at the listed mean diameters, although diameter alone does not compare mass.
5262400 m
Sourced measurement- Measurement
- Mean diameter · twice JPL mean radius
- Subject or version
- Mean-diameter reference · idealized sphere
- In kilometers
- 5,262.4 km (1 km = 1,000 m)
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A little more perspective
JPL supplies a 2,631.20-kilometer mean radius. The light and dark surface illustration helps identify the moon, while its precise scale comes from the numerical record rather than the apparent size of surface patches.
The displayed diameter is 2 × 2,631.2 km = 5,262.4 km. Doubling the source radius uncertainty gives ±3.4 km for diameter. The source defines mean radius through an equivalent-volume sphere. Its review date is not a new measurement date.
Quick facts
Ganymede has a reference mean diameter of 5,262.4 kilometers. Its disk is larger than Mercury’s at the listed mean diameters, although diameter alone does not compare mass.
For a presentation or a research note, include the subject, the measurement definition, and the measurement used. A picture alone cannot explain those choices. The comparison guide explains how to export an image and its source notes together.
Sources and measurement notes
Source review recorded . Maintained by Ishan Karunaratne. Suggest a correction with a source and the exact measurement being compared.