Q158116

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

K. Reinmuth

Discovery site

Heidelberg

Discovery date

12 September 1920

Pronunciation

/ ˈ b ɛ θ ɡ i ə /

Alternative designations

1920 HO; A916 GA; 1946 GC; 1959 EQ

Observation arc

99.97 yr (36513 days)

Aphelion

2.7160 AU (406.31 Gm )

Perihelion

1.7473 AU (261.39 Gm)

Semi major axis

2.2317 AU (333.86 Gm)

Orbital period sidereal

3.33 yr (1217.7 d )

Mean anomaly

296.008 °

Mean motion

0° 17 44.304 / day

Inclination

3.6963°

Longitude of ascending node

243.574°

Argument of perihelion

72.509°

Synodic rotation period

8.356 h, 7.5390 h (0.31413 d )

via Wikipedia infobox

Wikidata facts

Diameter

11.383

Orbital period

1217.14282488421

via Wikidata · CC0