Q157481

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

22 January 1917

Pronunciation

/ ɜːr ˈ s aɪ n ə /

Alternative designations

1917 BD

Observation arc

113.24 yr (41362 days)

Aphelion

3.0938 AU (462.83 Gm )

Perihelion

2.5013 AU (374.19 Gm)

Semi major axis

2.7975 AU (418.50 Gm)

Orbital period sidereal

4.68 yr (1709.1 d )

Mean anomaly

247.967 °

Mean motion

0° 12 38.304 / day

Inclination

13.297°

Longitude of ascending node

309.388°

Argument of perihelion

21.338°

Earth moid

1.49307 AU (223.360 Gm)

Jupiter moid

2.21886 AU (331.937 Gm)

Mean radius

14.66 ± 0.8 km

via Wikipedia infobox