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21629 Siperstein

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Also known as Siperstein

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
Parent body
Sun
Minor-planet group
asteroid belt
Orbital period
1185.608787327519
Show 14 more facts
provisional designation
1999 NT8
time of discovery or invention
1999-07-13
orbital eccentricity
0.03118609258106582
orbital inclination
1.208295248393734
periapsis
2.123907929147808
apoapsis
2.260645002810442
semi-major axis of an orbit
2.192276465979125
mean anomaly
124.7150666555603
longitude of ascending node
179.943157163476
argument of periapsis
42.3880541864315
absolute magnitude
15.38
time of periapsis
2460589.768669614
Sources (2)

via Wikidata · CC0