What is being measured?
Twice the published 11.08 km mean radius (reported uncertainty 0.04 km). Equivalent-volume spherical diameter, not maximum or equatorial extent.
Use the named object, variant and dimension. A manufactured or natural object can differ from this reference.
- Dimension
- volumetric mean diameter
- Reference value
- 22.16 km
- Evidence
- Published reference measurement
- In metres
- 22160.00 m
- Variant
- Equivalent-volume spherical reference
Put the length in perspective
One Phobos — mean diameter represents approximately 259,000 card lengths measured end to end. This is a length ratio; it does not calculate how the objects pack or fit.
Phobos — mean diameter · 22160.00 m
Metre · 1 m · too small to see
Foot (international) · 0.3048 m · too small to see