Q140399

Picture of the Day · NASA

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

Key facts

Discovered by

L. Oterma

Discovery site

Turku Obs.

Discovery date

18 November 1938

Named after

Kokkola (Finnish town)

Alternative designations

1938 WO · 1949 WB

Minor planet category

main-belt · Vestoid

Observation arc

77.72 yr (28,389 days)

Aphelion

2.5398 AU

Perihelion

2.1955 AU

Semi major axis

2.3677 AU

Orbital period sidereal

3.64 yr (1,331 days)

Mean anomaly

196.45 °

Mean motion

0° 16 13.8 / day

Inclination

5.3522°

Longitude of ascending node

60.617°

Argument of perihelion

30.542°

Dimensions

8.65 ± 0.57 km , 9.422 ± 0.094 km , 9.57 km (derived) , 9.781 ± 0.080 km

Synodic rotation period

5.83 h

via Wikipedia infobox