Q155655

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

A. Kopff

Discovery site

Heidelberg

Discovery date

3 November 1905

Pronunciation

/ s aɪ ˈ d oʊ n i ə /

Alternative designations

1905 SD

Observation arc

109.22 yr (39891 d)

Aphelion

3.2535 AU (486.72 Gm )

Perihelion

2.7680 AU (414.09 Gm)

Semi major axis

3.0107 AU (450.39 Gm)

Orbital period sidereal

5.22 yr (1908.1 d )

Mean anomaly

161.100 °

Mean motion

0° 11 19.212 / day

Inclination

11.009°

Longitude of ascending node

82.737°

Argument of perihelion

228.785°

Mean radius

42.785 ± 1.1 km

Synodic rotation period

16.286 h (0.6786 d )

Geometric albedo

0.1748 ± 0.009

via Wikipedia infobox

Wikidata facts

Diameter

85.57

Orbital period

1909.195883123857

via Wikidata · CC0