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
- C. Shoemaker
- Discovery site
- Palomar Obs.
- Discovery date
- 14 October 1985
- Pronunciation
- / p ɒ l i ˈ p iː t iː z /
- Named after
- Polypoites , (Greek mythology)
- Alternative designations
- 1985 TL 3 · 1971 OK 1 , 1979 HQ 2 · 1985 WK
- Minor planet category
- Jupiter trojan , Greek · background
- Adjectives
- Polypoitian
- Observation arc
- 46.17 yr (16,865 d)
- Aphelion
- 5.5573 AU
- Perihelion
- 4.9230 AU
- Semi major axis
- 5.2401 AU
- Orbital period sidereal
- 12.00 yr (4,381 d)
- Mean anomaly
- 203.47 °
- Mean motion
- 0° 4 55.92 / day
- Inclination
- 19.620°
- Longitude of ascending node
- 187.12°
- Argument of perihelion
- 246.05°
via Wikipedia infobox
Wikidata facts
- Instance of
- asteroid
- Named after
- Polypoetes
- Followed by
- 3710 Bogoslovskij
- Follows
- 3708 Socus
- Parent body
- Sun
- Minor-planet group
- asteroid belt
- Diameter
- 65.297
- Orbital period
- 4352.542131974611
Show 18 more facts
- discoverer or inventor
- Carolyn S. Shoemaker
- site of astronomical discovery
- Palomar Observatory
- provisional designation
- 1985 WK
- time of discovery or invention
- 1985-10-14
- orbital inclination
- 19.64553417053427
- orbital eccentricity
- 0.06026411180272082
- periapsis
- 4.902702235784702
- apoapsis
- 5.531510817820579
- semi-major axis of an orbit
- 5.217106526802641
- mean anomaly
- 71.59419704449333
- longitude of ascending node
- 187.0484482817157
- argument of periapsis
- 249.3442231878145
- absolute magnitude
- 9.19
- Commons category
- 3709 Polypoites
- albedo
- 0.087
- rotation period
- 10.039
- time of periapsis
- 2460134.8978915527
- epoch
- November 21, 2025
via Wikidata · CC0
~4 min read
Encyclopedic overview
3709 Polypoites /pɒliˈpiːtiːz/ is a large Jupiter trojan from the Greek camp, approximately 85 kilometers (53 miles) in diameter. The Trojan asteroid was discovered on 14 October 1985, by American astronomer Carolyn Shoemaker at the Palomar Observatory in California, United States, and named after Polypoites from Greek mythology. The dark D-type asteroid belongs to the 50 largest Jupiter trojans. It has a rotation period of 10 hours and possibly a spherical shape.
Orbit and classification
Excerpted from Wikipedia’s “3709 Polypoites” article, available under the CC BY-SA 4.0 licence.