Q139317

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

Y. Väisälä

Discovery site

Turku Obs.

Discovery date

20 February 1938

Named after

Jean Jacques Raimond, Jr. , (Dutch astronomer)

Alternative designations

1938 DP · 1934 GJ, A915 TF

Minor planet category

main-belt · ( middle ) , background

Observation arc

101.96 yr (37,242 days)

Aphelion

3.0591 AU

Perihelion

2.1642 AU

Semi major axis

2.6117 AU

Orbital period sidereal

4.22 yr (1,542 days)

Mean anomaly

351.45 °

Mean motion

0° 14 0.6 / day

Inclination

4.8635°

Longitude of ascending node

74.927°

Argument of perihelion

13.427°

Dimensions

14.75 km (derived) , 14.76 ± 4.56 km , 14.88 ± 0.9 km , 18.481 ± 0.084 km , 18.700 ± 0.068 km , 20.80 ± 1.15 km

Synodic rotation period

12.6344 h , 12.66 h

via Wikipedia infobox