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
Wikidata facts
- Instance of
- asteroid
- Named after
- Iisalmi
- Followed by
- 2821 Slávka
- Follows
- 2819 Ensor
- Parent body
- Sun
- Minor-planet group
- asteroid belt
- Diameter
- 6.826
- Orbital period
- 1215.835254877247
Show 17 more facts
- discoverer or inventor
- Yrjö Väisälä
- site of astronomical discovery
- Iso-Heikkilä Observatory
- provisional designation
- 1979 YS5
- time of discovery or invention
- 1942-09-08
- orbital eccentricity
- 0.1613740894216241
- apoapsis
- 2.58914478067704
- semi-major axis of an orbit
- 2.229380527997193
- mean anomaly
- 336.8763397148681
- longitude of ascending node
- 216.7018702231927
- argument of periapsis
- 160.0700727996175
- absolute magnitude
- 13.03
- orbital inclination
- 2.948036241965095
- periapsis
- 1.869616275317347
- albedo
- 0.264
- rotation period
- 2.758
- time of periapsis
- 2461078.596003879
- epoch
- November 21, 2025
Sources (2)
via Wikidata · CC0
~2 min read
Encyclopedic overview
The following is a partial list of minor planets, running from minor-planet number 2001 through 3000, inclusive. The primary data for this and other partial lists is based on JPL's "Small-Body Orbital Elements" and data available from the Minor Planet Center. Critical list information is also provided by the MPC, unless otherwise specified from Lowell Observatory. A detailed description of the table's columns and additional sources are given on the main page including a complete list of every page in this series, and a statistical break-up on the dynamical classification of minor planets.
Also see the summary list of all named bodies in numerical and alphabetical order, and the corresponding naming citations for the number range of this particular list. New namings may only be added to this list after official publication, as the preannouncement of names is condemned by the Working Group for Small Bodies Nomenclature of the International Astronomical Union.
Excerpted from Wikipedia’s “2820 Iisalmi” article, available under the CC BY-SA 4.0 licence.