Q11553

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 Obs.

Discovery date

31 January 1924

Pronunciation

/ ə ˈ n iː t r ə /

Named after

fictional character, in drama Peer Gynt

Alternative designations

1924 QG · 1929 TE 1

Minor planet category

main-belt · ( inner ) , Flora

Observation arc

93.42 yr (34,123 days)

Aphelion

2.5035 AU

Perihelion

1.9356 AU

Semi major axis

2.2196 AU

Orbital period sidereal

3.31 yr (1,208 days)

Mean anomaly

176.01 °

Mean motion

0° 17 53.16 / day

Inclination

6.0352°

Longitude of ascending node

8.8588°

Argument of perihelion

53.320°

Dimensions

9.539 ± 0.078 km , 10.302 ± 0.068 km , 12.97 km (calculated)

via Wikipedia infobox

Wikidata facts

Instance of

asteroid

Followed by

Q11554

Follows

Q11552

Parent body

Sun

Minor-planet group

asteroid belt

Diameter

9.539

Orbital period

1207.56243643572

via Wikidata · CC0