Q143749

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

Indiana University , ( Indiana Asteroid Program )

Discovery site

Goethe Link Obs.

Discovery date

25 July 1952

Named after

Carl C. Kiess (astronomer)

Alternative designations

1952 OZ · 1935 NE, 1964 WP

Minor planet category

main-belt · Themis

Observation arc

64.78 yr (23,660 days)

Aphelion

3.5961 AU

Perihelion

2.6381 AU

Semi major axis

3.1171 AU

Orbital period sidereal

5.50 yr (2,010 days)

Mean anomaly

323.37 °

Mean motion

0° 10 44.76 / day

Inclination

0.6816°

Longitude of ascending node

161.91°

Argument of perihelion

143.60°

Dimensions

19.59 km (calculated) , 20.993 ± 0.271 km

Synodic rotation period

11.0335 ± 0.0071 h , 12 ± 2 h

via Wikipedia infobox

Wikidata facts

Instance of

asteroid

Named after

Carl Clarence Kiess

Followed by

Q143773

Follows

Q143744

Parent body

Sun

Minor-planet group

asteroid belt

Diameter

20.993

Orbital period

2018.416707672409

via Wikidata · CC0