Q154415

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

Friedrich Karl Arnold Schwassmann

Discovery site

Heidelberg (024)

Discovery date

28 March 1900

Pronunciation

/ m ə ˈ θ iː s ɪ s /

Named after

mathematics

Alternative designations

1900 FC

Minor planet category

main belt

Observation arc

116.05 yr (42387 d)

Aphelion

2.9158 AU (436.20 Gm )

Perihelion

2.3409 AU (350.19 Gm)

Semi major axis

2.6284 AU (393.20 Gm)

Orbital period sidereal

4.26 yr (1556.4 d )

Mean anomaly

98.12293 °

Mean motion

0° 13 52.679 / day

Inclination

6.29209869841666°

Longitude of ascending node

32.29958°

Argument of perihelion

177.3387°

Dimensions

81.57 ± 3.2 km

via Wikipedia infobox

Wikidata facts

Diameter

81.743

Mass

586000000000000000

Orbital period

1554.849156381765

via Wikidata · CC0