Q154937

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

Max Wolf

Discovery site

Heidelberg

Discovery date

16 January 1903

Pronunciation

German: [ ˈzeːliːnʊɐ̯ ]

Alternative designations

1903 LA

Observation arc

112.90 yr (41238 d)

Aphelion

2.9936 AU (447.84 Gm )

Perihelion

2.2313 AU (333.80 Gm)

Semi major axis

2.6124 AU (390.81 Gm)

Orbital period sidereal

4.22 yr (1542.3 d )

Mean anomaly

43.1528 °

Mean motion

0° 14 0.312 / day

Inclination

9.7716°

Longitude of ascending node

289.934°

Argument of perihelion

74.510°

Mean radius

21.60 ± 0.55 km

Synodic rotation period

8.0111 h (0.33380 d )

Geometric albedo

0.1804 ± 0.009

via Wikipedia infobox