15 kilometres
15 kmLength · definition
The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.
Length & distance
Just how long is 15 kilometres?
Our planet
15 km
15 kilometres
The quantity is exact as entered.
15 kmLength
0 - shared origin
Deimos
Deimos is the smaller and outermost natural satellite of Mars, with an irregular, rocky shape.
12.4 kmRepresentative mean diameter
0 - shared origin
Both rulers start at the same zero and share one linear scale. Artwork keeps its original proportions. A ruler represents the selected distance or a measurement not visible in this view.
A little perspective
15 kilometres is about 1.21 times the mean diameter of Deimos.
Measurements, assumptions & sources +
15 kilometres
Length: 15 km; definition.
The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.
Deimos
Representative mean diameter: 12.4 km; approximate; range 10 km–15 km.
Mars’s smaller moon is irregular, roughly 15 × 12 × 11 km. The 12.4 km diameter is a representative comparison span rather than a hard spherical edge.
The marked representative mean diameter is calibrated. Unmeasured illustration details are representative.
Measurement details
Why these numbers?
Compare 15 kilometres with the mean diameter of Deimos. The notes below explain how each value was chosen.
Deimos
12.4 kmRepresentative mean diameter · approximate · range 10 km–15 km
Mars’s smaller moon is irregular, roughly 15 × 12 × 11 km. The 12.4 km diameter is a representative comparison span rather than a hard spherical edge.
- Comparing
- Length ↔ Representative mean diameter
- Relative size
- 15 kilometres is about 1.21 times the mean diameter of Deimos. 15 kilometres is approximately 21% greater than the mean diameter of Deimos.
How to read the visual
The diagram uses the recorded measurements. Details outside the marked spans do not set the scale.
- We use 12.4 km for the mean diameter of Deimos; the recorded range is 10 km–15 km.
- The mean diameter of Deimos: This is an estimate; check the notes for its rounding and uncertainty.
- The recorded ranges overlap, so the ordering can vary even though the central values differ.
This comparison follows the selected length only; other dimensions may differ.
15,000 mmetres
49,213 ftfeet
9.3206 mimiles
1.0027 × 10⁻⁷ AUastronomical units
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A little smaller. A little larger.