NASA/UC Berkeley spacecraft

ARTEMIS-P1 (THEMIS-B)

Also themis · artemis p1 · artemis p2 · artemisp2 · themis b · themis c

Active by NASA's listing: THEMIS-ARTEMIS is an "Active Mission" with two craft round the Moon (science.nasa.gov, page updated 2026-08-11), though that page does not name P1 or P2. JPL's trajectory rests on tracking through 2026-10-15 (Horizons, revised 2026-10-20), so someone was tracking it then. One of five THEMIS craft launched in 2007, sent on to the Moon, in orbit since 2011.

At the Moon.

Measured

Agency: NASA/UC Berkeley
Arrived: 2011-06-27
From the Earth today: 419,192 km
From The Moon's centre: 17,259 km
Body, across: 0.84 m

How far, from the Earth

419,000 km. To cross it:

Light1.4 seconds
Voyager 1's speed6 hours 54 minutes
Driving at 100 km/h5.74 months

Voyager 1 at the speed it moved outward over the year to 2026-10-25 (JPL Horizons). Driving: nonstop, never refuelling.

Facts

JPL Horizons trajectory round the Moon: worst miss 444 km on the dates it was checked against (median 94 km); between those dates as much as about 1,300 km. Dates after the data was fetched are Horizons' predictions, which it revises as a mission flies.

Where this comes from

NASA/UC Berkeley
Spacecraft trajectories: JPL Horizons, NASA/JPL-Caltech; each mission's agency credited on its card.
3D model: THEMIS model: NASA/JPL/Eyes on the Solar System, NASA 3D Resources

Every catalogue Ouranos draws is credited on the credits page.