928 Hildrun

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

23 February 1920

Named after

Name picked from the almanac , Lahrer Hinkender Bote

Alternative designations

A920 DC · 1920 GP, 1959 EE 1

Minor planet category

main-belt · ( outer ) , background

Observation arc

99.79 yr (36,447 d)

Aphelion

3.5999 AU

Perihelion

2.6698 AU

Semi major axis

3.1349 AU

Orbital period sidereal

5.55 yr (2,027 d)

Mean anomaly

9.2453 °

Mean motion

0° 10 39.36 / day

Inclination

17.653°

Longitude of ascending node

129.83°

Argument of perihelion

21.894°

Mean diameter

62.817 ± 0.293 km 64.04 ± 1.09 km 66.49 ± 1.7 km

Synodic rotation period

14.13 ± 0.03 h

via Wikipedia infobox