Skip to content
EntityQ14227867· pop 6

208351 Sielmann

Sign in to save

Also known as Sielmann

asteroid

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
Heinz Sielmann
Parent body
Sun
Minor-planet group
asteroid belt
Diameter
8.496
Orbital period
2041.681140941089
Show 16 more facts
discoverer or inventor
André Knöfel
provisional designation
2001 RO15
time of discovery or invention
2001-09-08
site of astronomical discovery
Drebach Observatory
orbital eccentricity
0.196367364473669
absolute magnitude
14.95
mean anomaly
77.80643892442129
argument of periapsis
108.7884959293446
orbital inclination
25.27654454240514
longitude of ascending node
304.883344595202
albedo
0.035
semi-major axis of an orbit
3.149630883335885
periapsis
2.531146167710344
apoapsis
3.768115598961427
time of periapsis
2460559.2335027894
Sources (2)

via Wikidata · CC0

Available in 6 languages

via Wikidata sitelinks · CC0