Largest Asteroids Diameter Comparison (KM)
Compare the 10 largest asteroids by mean diameter, from Ceres at 939 km to Juno at 250. Diameters in exact km and miles with NASA and VLT sources listed.
Visual comparison
All values
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| Name | Value | Context | Source |
|---|---|---|---|
| 1 Ceres NASA PDS axes 964 by 964 by 892. Dawn visited 2015. | 939.4 kilometers | Dwarf planet, first found 1801 | Wikipedia exceptional asteroids: Ceres 939.4 km mean |
| 4 Vesta NASA PDS axes 573 by 557 by 446. Dawn orbited 2011. | 525.4 kilometers | Protoplanet, found 1807 | Wikipedia exceptional asteroids: Vesta 525.4 km mean |
| 2 Pallas Most tilted orbit at 34.9 degrees. | 511 kilometers | B-type, found 1802 | Wikipedia exceptional asteroids: Pallas 511 km mean |
| 10 Hygiea Fourth largest by mass and volume. | 433 kilometers | C-type, found 1849 | Wikipedia exceptional asteroids: Hygiea 433 km mean |
| 704 Interamnia Fifth most massive. Round shape. | 326 kilometers | F-type, found 1910 | VLT 2019 to 2021 sizes: Interamnia about 326 km |
| 52 Europa Not the Jupiter moon. Sixth by volume. | 315 kilometers | C-type, found 1858 | VLT sizes: Europa about 315 km |
| 511 Davida Once thought larger. Revised down. | 310 kilometers | C-type, found 1903 | VLT sizes: Davida about 310 km |
| 15 Eunomia Largest stony asteroid. | 270 kilometers | S-type, found 1851 | VLT sizes: Eunomia about 270 km |
| 87 Sylvia Has two small moons. | 260 kilometers | X-type, first triple system, 1866 | VLT sizes: Sylvia about 260 km |
| 3 Juno Third found. Irregular potato shape. | 250 kilometers | S-type, found 1804 | VLT sizes: Juno about 250 km |
About this converter
Ceres spans 939.4 km mean diameter, almost double Vesta at 525.4. Pallas at 511 and Hygiea at 433 follow. Interamnia at 326, Europa at 315 and Davida at 310 cluster near 320. Eunomia at 270, Sylvia at 260 and Juno at 250 close the table. Diameters here are geometric means from VLT imaging 2019 to 2021, since rock piles are not spheres. Ceres axes run 964 by 964 by 892 per NASA PDS. Vesta axes run 573 by 557 by 446. Ceres alone holds about 39 percent of belt mass.
How to use it
Pick two asteroids and a unit in the top row. The three boxes below stay linked. Change any box and the other two update. Try Ceres against Vesta to see the near double gap. The bars below scale to Ceres so Juno looks thin next to it. Switch the unit to miles for US figures. Ratios are exact divisions of the mean diameters.
Shapes drive gaps. Means average three axes, so single axis figures differ. NASA lists Ceres near 950 in outreach and 939.4 mean in tables. Vesta is called 530 in outreach and 525.4 mean in tables. We list means as primary with axes noted. VLT 2019 to 2021 revised Interamnia, Europa, Davida, Eunomia, Sylvia and Juno down from older IRAS totals. Mass order differs slightly from size order.
FAQ
What is the largest asteroid?
Ceres at 939.4 km mean. It is also a dwarf planet, visited by Dawn in 2015.
How big is Vesta?
525.4 km mean. Axes run 573 by 557 by 446. Dawn orbited it in 2011.
Why do diameters differ between sources?
Irregular shapes. Means average three axes. VLT imaging revised many totals down from IRAS.
Is Ceres a planet?
A dwarf planet since 2006. It keeps its first asteroid number and its belt lead.
Sources
- Wikipedia: List of exceptional asteroids largest by diameter (Ceres 939.4; Vesta 525.4; Pallas 511; Hygiea 433 km mean, VLT 2019 to 2021)
- NASA PDS Small Bodies Node: 1 Ceres axes 964.4 by 964.2 by 891.8; 4 Vesta axes 572.6 by 557.2 by 446.4 km
- NASA Dawn mission pages: Vesta orbit 2011 to 2012, Ceres arrival 2015
Last verified: 2026-10-09 · 10 entries
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