646 Kastalia

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

August Kopff

Discovery site

Heidelberg

Discovery date

11 September 1907

Pronunciation

/ k æ ˈ s t eɪ l i ə /

Alternative designations

1907 AC

Observation arc

108.60 yr (39665 d)

Aphelion

2.8200 AU (421.87 Gm )

Perihelion

1.8300 AU (273.76 Gm)

Semi major axis

2.3250 AU (347.82 Gm)

Orbital period sidereal

3.55 yr (1294.9 d )

Mean anomaly

266.366 °

Mean motion

0° 16 40.872 / day

Inclination

6.9010°

Longitude of ascending node

302.820°

Argument of perihelion

38.142°

Dimensions

8.15 ± 0.15 km

via Wikipedia infobox

Wikidata facts

Instance of

asteroid

Followed by

647 Adelgunde

Follows

645 Agrippina

Parent body

Sun

Minor-planet group

asteroid belt

Diameter

8.153

Orbital period

1295.484141877971

via Wikidata · CC0