# Donaldjohanson

*In the Solar System*

A main-belt asteroid about eight kilometres long, here because Lucy flew past it in April 2025 as a rehearsal for the Trojan asteroids it is really going to. It turned out to be two bodies stuck together at a narrow neck, and the flyby is the reason the photograph on this card exists at all. It is named after the palaeontologist who found the fossil Lucy, which is what the spacecraft is named after.

| | |
| --- | --- |
| Radius | 2 km |
| Around the equator | 12 km |
| From the Sun | 422,755,032 km (+31,692 km/d) |
| From the Earth | 353,744,132 km (+2,016,757 km/d) |
| A signal takes | 20 min |

Distances and speed are computed from JPL Horizons trajectories and are true of 2026-09-05, changing at the rate given beside each. The interpolation itself is good to a few kilometres; what ages these figures is the date, not the arithmetic.

## Elsewhere

- On the live map: https://www.orbitalmap.space/?world=solar-system&focus=donaldjohanson
- This object as a page: https://www.orbitalmap.space/o/donaldjohanson/
- Every object: https://www.orbitalmap.space/o/
- What this site is and what it reads: https://www.orbitalmap.space/llms.txt