سیارک ۸۵۴

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

(854) Frostia

Orbit class

Main-belt

Semi-major axis

2.368 AU

Eccentricity

0.176

Inclination

6.085 °

Absolute magnitude

12.040 H

via Minor Planet Center

Key facts

Discovered by

S. Beljavskij

Discovery date

3 April 1916

Pronunciation

/ ˈ f r ɒ s t i ə /

Alternative designations

SIGMA 29; 1931 MB; 1935 QE; 1950 VP

Minor planet category

Main belt

Observation arc

73.52 yr (26853 d)

Aphelion

2.7805 AU (415.96 Gm )

Perihelion

1.9566 AU (292.70 Gm)

Semi major axis

2.3685 AU (354.32 Gm)

Orbital period sidereal

3.65 yr (1331.4 d )

Mean anomaly

128.5557 °

Mean motion

0° 16 13.393 / day

Inclination

6.0883°

Longitude of ascending node

190.6003°

Argument of perihelion

84.3355°

Dimensions

8.39 ± 1.27 km

Mass

(1.06 ± 0.95) × 10 kg

Mean density

0.88 ± 0.13 g/cm

via Wikipedia infobox

Wikidata facts

Instance of

asteroid

Named after

Edwin Brant Frost

Followed by

855 Newcombia

Follows

853 Nansenia

Parent body

Sun

Minor-planet group

asteroid belt

Diameter

7.839

Orbital period

1330.824352228471

via Wikidata · CC0