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EntityQ709200· pop 19

5558 Johnnapier

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Also known as (5558) 1989 WL2, Johnnapier

inner main-belt minor planet

Picture of the Day · NASA

Pathfinder on Mars

Pathfinder on Mars

2026-07-04

On July 4th, 1997, using its own array of fireworks, a parachute, and a cocoon of airbags, the Mars Pathfinder spacecraft bounced like a giant beach ball at least 15 times before it came to rest on the surface of Mars at 10:07 AM Pacific Daylight Time. After its then novel airbag-assisted landing sequence was completed, Pathfinder transmitted this color mosaic to mission operators on Earth. In the scene from another world, the Mars Sojourner robot rover is visible in the foreground, crouched on top of the unfolded Pathfinder. About the size of a large house cat, the six-wheeled, solar-powered Sojourner became the first successful Martian rover. Surrounding Pathfinder are deflated airbags and the rock-strewn terrain of the Ares Vallis floodplain. In the distance Martian hills appear against a dusty brownish sky. The Pathfinder lander was subsequently renamed the Carl Sagan Memorial Station.

via NASA APOD

Wikidata facts

Instance of
asteroid
Named after
John Napier
Followed by
Q905096
Parent body
Sun
Diameter
2.327
Orbital period
983.3163499500295
Show 17 more facts
discoverer or inventor
Robert H. McNaught
site of astronomical discovery
Siding Spring Observatory
provisional designation
1989 WL2
time of discovery or invention
1989-11-24
orbital eccentricity
0.1127437032576519
orbital inclination
23.38367215059672
periapsis
1.717034332928433
apoapsis
2.153401614909186
semi-major axis of an orbit
1.935217973918809
mean anomaly
150.8027934599298
longitude of ascending node
138.841544794553
argument of periapsis
264.7643932695737
absolute magnitude
14.37
albedo
0.819
rotation period
73.9
time of periapsis
2460588.5920765908
Sources (2)

via Wikidata · CC0