File:A112.M119.shape.png · Wikimedia Commons · See Wikimedia Commons
20 Massalia is an asteroid located in the main belt between Mars and Jupiter. It is one of the larger main-belt asteroids and was among the earlier asteroids discovered, making it historically significant in the study of our solar system.
AI-generated from the Wikipedia summary — may contain errors.
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
- Marseille
- Followed by
- Q107556
- Follows
- 19 Fortuna
- Parent body
- Sun
- Minor-planet group
- asteroid belt
- Diameter
- 135.68
- Mass
- 5.2
- Orbital period
- 1365.191178766373
- Image
- A112.M119.shape.png
Show 21 more facts
- discoverer or inventor
- Annibale de Gasparis
- site of astronomical discovery
- Astronomical Observatory of Capodimonte
- time of discovery or invention
- 1852-09-19
- asteroid spectral type
- S-type asteroid
- asteroid family
- Massalia family
- orbital inclination
- 0.7092558560319595
- density
- 3.54
- rotation period
- 8.098
- albedo
- 0.241
- Commons category
- 20 Massalia
- provisional designation
- A852 SA
- absolute magnitude
- 6.54
- orbital eccentricity
- 0.1437635652866909
- semi-major axis of an orbit
- 2.40840783303004
- periapsis
- 2.062166536289249
- apoapsis
- 2.754649129770832
- longitude of ascending node
- 205.9545887067697
- argument of periapsis
- 257.2332594127041
- mean anomaly
- 29.9998442706781
- time of periapsis
- 2460886.7346589924
- epoch
- November 21, 2025
Sources (2)
via Wikidata · CC0
~4 min read
Encyclopedic overview
20 Massalia is a stony asteroid and the parent body of the Massalia family located in the inner region of the asteroid belt, approximately 145 kilometers (90 miles) in diameter. Discovered by Italian astronomer Annibale de Gasparis on 19 September 1852, it was named for the Latin name of the French city of Marseille, from which the independent discover Jean Chacornac sighted it the following night. It was the first asteroid that was not assigned an iconic symbol by its discoverer.
It came to opposition 179 degrees from the Sun on 21 March 2026.
Excerpted from Wikipedia’s “20 Massalia” article, available under the CC BY-SA 4.0 licence.