Skip to content
EntityQ1045049· pop 25

Also known as Greenstein, (4612) Greenstein

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
Followed by
4613 Mamoru
Parent body
Sun
Minor-planet group
asteroid belt
Diameter
7.674
Orbital period
1493.805448273661
Show 17 more facts
discoverer or inventor
Eleanor F. Helin
site of astronomical discovery
Palomar Observatory
provisional designation
1989 JJ
time of discovery or invention
1989-05-02
orbital eccentricity
0.1374023659205866
mean anomaly
51.42166148295008
longitude of ascending node
105.3348463818704
argument of periapsis
40.11379951746317
absolute magnitude
12.89
orbital inclination
9.622209414115138
periapsis
2.205999133127883
apoapsis
2.908782187788172
semi-major axis of an orbit
2.557390660458027
albedo
0.228
rotation period
3.008
time of periapsis
2460787.1278942153
Sources (2)

via Wikidata · CC0