Q156450

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

August Kopff

Discovery site

Heidelberg

Discovery date

22 April 1909

Alternative designations

1909 GW

Observation arc

106.97 yr (39070 d)

Aphelion

4.0692 AU (608.74 Gm )

Perihelion

2.2223 AU (332.45 Gm)

Semi major axis

3.1457 AU (470.59 Gm)

Orbital period sidereal

5.58 yr (2037.9 d )

Mean anomaly

23.547 °

Mean motion

0° 10 35.94 / day

Inclination

17.498°

Longitude of ascending node

38.042°

Argument of perihelion

245.721°

Mean radius

41.96 ± 0.7 km , 42.345 ± 0.855 km

Mass

(2.69 ± 0.04) × 10 kg

Mean density

8.45 ± 0.52 g/cm

Synodic rotation period

11.089 h (0.4620 d )

via Wikipedia infobox

Wikidata facts

Diameter

83.92

Orbital period

2025.832296389835

via Wikidata · CC0