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
Small body data
(21677) Tylerlyon
- Orbit class
- Main-belt
- Semi-major axis
- 2.519 AU
- Eccentricity
- 0.141
- Inclination
- 3.623 °
- Absolute magnitude
- 15.220 H
via Minor Planet Center
Wikidata facts
- Instance of
- asteroid
- Followed by
- 21678 Lindner
- Follows
- 21676 Maureenanne
- Parent body
- Sun
- Minor-planet group
- asteroid belt
- Orbital period
- 1460.116063166194
Show 14 more facts
- discoverer or inventor
- Lincoln Near-Earth Asteroid Research
- provisional designation
- 1999 RO23
- time of discovery or invention
- 1999-09-07
- orbital eccentricity
- 0.1415647560996797
- orbital inclination
- 3.623273191926481
- periapsis
- 2.162221464612113
- apoapsis
- 2.875366355729489
- semi-major axis of an orbit
- 2.518793910170801
- mean anomaly
- 133.4824922196165
- longitude of ascending node
- 130.991571851887
- argument of periapsis
- 305.5746996049779
- absolute magnitude
- 15.22
- time of periapsis
- 2460459.111302663
- epoch
- November 21, 2025
Sources (2)
via Wikidata · CC0