223 Rosa

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

Johann Palisa

Discovery date

9 March 1882

Alternative designations

A882 EA, 1887 BA, 1942 EL

Minor planet category

Main belt ( Themis )

Observation arc

130.29 yr (47590 d)

Aphelion

3.45415 AU (516.733 Gm )

Perihelion

2.73689 AU (409.433 Gm)

Semi major axis

3.09552 AU (463.083 Gm)

Orbital period sidereal

5.45 yr (1989.3 d )

Average orbital speed

16.94 km/s

Mean anomaly

309.511 °

Mean motion

0° 10 51.488 / day

Inclination

1.93552°

Longitude of ascending node

47.9276°

Argument of perihelion

61.7716°

Mean diameter

82.7 ± 8.4 km

Mass

(5.979 ± 2.971) × 10 kg

Mean density

1.790 ± 50% g/cm

via Wikipedia infobox