Q156848

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

Franz Kaiser

Discovery site

Heidelberg

Discovery date

7 January 1913

Pronunciation

/ æ l ə ˈ ɡ æ s t ə /

Named after

Gau-Algesheim

Alternative designations

1913 QO

Observation arc

103.3 yr (37,720 d)

Aphelion

3.2040 AU (479.31 Gm )

Perihelion

2.8698 AU (429.32 Gm)

Semi major axis

3.0369 AU (454.31 Gm)

Orbital period sidereal

5.29 yr (1,933.1 d )

Mean anomaly

146.545 °

Mean motion

0° 11 10.428 / day

Inclination

3.5344°

Longitude of ascending node

132.115°

Argument of perihelion

41.826°

Earth moid

1.87517 AU (280.521 Gm)

Jupiter moid

1.76226 AU (263.630 Gm)

via Wikipedia infobox