Q157504

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

M. F. Wolf

Discovery site

Heidelberg Obs.

Discovery date

25 February 1917

Named after

Fatme, a character in the opera Abu Hassan , ( Carl Maria von Weber )

Alternative designations

A917 DG · 1950 DF 1 , 1917 BQ

Minor planet category

main-belt · ( outer ) , background

Observation arc

102.93 yr (37,596 d)

Aphelion

3.2871 AU

Perihelion

2.9606 AU

Semi major axis

3.1238 AU

Orbital period sidereal

5.52 yr (2,017 d)

Mean anomaly

34.544 °

Mean motion

0° 10 42.6 / day

Inclination

8.6616°

Longitude of ascending node

91.060°

Argument of perihelion

263.20°

Mean diameter

78.061 ± 0.360 km 86.49 ± 1.16 km 88.31 ± 2.0 km

Synodic rotation period

5.800 ± 0.002 h

via Wikipedia infobox