Q155209

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

20 March 1904

Pronunciation

/ j ʊər i ˈ æ n θ iː /

Alternative designations

1904 NR

Observation arc

112.06 yr (40931 d)

Aphelion

3.1363 AU (469.18 Gm )

Perihelion

2.3191 AU (346.93 Gm)

Semi major axis

2.7277 AU (408.06 Gm)

Orbital period sidereal

4.51 yr (1645.5 d )

Mean anomaly

245.24 °

Mean motion

0° 13 7.608 / day

Inclination

9.6595°

Longitude of ascending node

120.551°

Argument of perihelion

203.540°

Dimensions

52 ± 2 km

Synodic rotation period

26.06 h (1.086 d )

Geometric albedo

0.0576 ± 0.004

via Wikipedia infobox

Wikidata facts

Diameter

52.627

Orbital period

1642.604592052639

via Wikidata · CC0