42.195 kilometres
42.2 kmLength · definition
The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.
Length & distance
Just how long is 42.195 kilometres?
Our planet
42.195 km
42,195 mmetres
138,440 ftfeet
26.219 mimiles
2.8206 × 10⁻⁷ AUastronomical units
01
42.195 kilometres42.2 kmLength · definition
02
Phobos22.53 kmRepresentative mean diameter · approximate · range 18 km–27 km
Both marked spans share one linear scale. Artwork keeps its proportions; poses and surface detail are illustrative.
A little perspective
The length of 42.195 kilometres is about 1.87 times the representative mean diameter of Phobos.
Measurements, assumptions & sources +
42.195 kilometres
The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.
Phobos
Mars’s larger moon is irregular, about 27 × 22 × 18 km. The 22.533 km comparison diameter is representative rather than a spherical edge.
The marked representative mean diameter is calibrated. Unmeasured illustration details are representative.
Measurement details
Why these numbers?
The visual compares length with representative mean diameter. The records below preserve each value’s basis and caveats.
Phobos
22.53 kmRepresentative mean diameter · approximate · range 18 km–27 km
Mars’s larger moon is irregular, about 27 × 22 × 18 km. The 22.533 km comparison diameter is representative rather than a spherical edge.
- Comparing
- Length ↔ Representative mean diameter
- Relative size
- 42.195 kilometres is larger on this measurement by a factor of about 1.87. 42.195 kilometres's selected measurement is approximately 87.3% greater than Phobos's.
How to read the visual
The labelled spans and stored measurements determine the scale; unmeasured illustration details do not.
- Phobos uses a 22.53 km central value within a recorded range of 18 km–27 km.
- Phobos is labelled approximate; treat the displayed value as a comparison anchor rather than false precision.
Change your perspective
Put it next to…
Choose a suggestion to redraw the comparison, or open its page to learn what it is.
A little smaller. A little larger.