342 Endymion

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

Max Wolf

Discovery date

17 October 1892

Pronunciation

/ ɛ n ˈ d ɪ m i ə n /

Named after

Endymion

Alternative designations

1892 K

Minor planet category

Main belt , König · Bower

Observation arc

115.38 yr (42141 d)

Aphelion

2.89687 AU (433.366 Gm )

Perihelion

2.24079 AU (335.217 Gm)

Semi major axis

2.56883 AU (384.291 Gm)

Orbital period sidereal

4.12 yr (1503.8 d )

Mean anomaly

335.858 °

Mean motion

0° 14 21.793 / day

Inclination

7.34850°

Longitude of ascending node

232.690°

Argument of perihelion

224.708°

Dimensions

60.63 ± 2.8 km

Synodic rotation period

6.319 h (0.2633 d )

via Wikipedia infobox