Q155563

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

Discovery date

13 March 1905

Pronunciation

/ d ɛ ˈ l aɪ l ə / , German: [ deːliːlaː ]

Alternative designations

1905 QF

Observation arc

111.10 yr (40580 d)

Aphelion

3.1947 AU (477.92 Gm )

Perihelion

2.3053 AU (344.87 Gm)

Semi major axis

2.7500 AU (411.39 Gm)

Orbital period sidereal

4.56 yr (1665.7 d )

Mean anomaly

187.50 °

Mean motion

0° 12 58.032 / day

Inclination

8.4698°

Longitude of ascending node

105.351°

Argument of perihelion

3.8614°

Mean radius

18.62 ± 0.65 km

Synodic rotation period

29.913 h (1.2464 d )

Geometric albedo

0.0733 ± 0.005

via Wikipedia infobox

Wikidata facts

Diameter

35.334

Orbital period

1668.307936149424

via Wikidata · CC0