Q157365

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

25 September 1916

Pronunciation

/ z ɛ ˈ n oʊ b i ə /

Alternative designations

1916 AK

Observation arc

99.23 yr (36243 d)

Aphelion

3.4448 AU (515.33 Gm )

Perihelion

2.8197 AU (421.82 Gm)

Semi major axis

3.1322 AU (468.57 Gm)

Orbital period sidereal

5.54 yr (2024.8 d )

Mean anomaly

73.117 °

Mean motion

0° 10 40.08 / day

Inclination

9.9848°

Longitude of ascending node

272.773°

Argument of perihelion

10.358°

Earth moid

1.80367 AU (269.825 Gm)

Jupiter moid

1.68787 AU (252.502 Gm)

Synodic rotation period

5.565 h (0.2319 d )

via Wikipedia infobox