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15 Eunomia

File:15_Eunomia_VLT_(2021),_deconvolved.pdf · Wikimedia Commons · See Wikimedia Commons

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15 Eunomia

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Also known as (15) Eunomia, Eunomia

main-belt asteroid

AI overview

15 Eunomia is a large asteroid located in the main asteroid belt between Mars and Jupiter. It is notable as one of the largest and most massive asteroids, making it an important object for understanding the composition and history of our solar system.

AI-generated from the Wikipedia summary — may contain errors.

Picture of the Day · NASA

Pathfinder on Mars

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
Eunomia
Followed by
16 Psyche
Follows
14 Irene
Parent body
Sun
Minor-planet group
asteroid belt
Diameter
231.689
Mass
3.341019
Orbital period
1568.713144375437
Image
15Eunomia (Lightcurve Inversion).png
Show 21 more facts
discoverer or inventor
Annibale de Gasparis
site of astronomical discovery
Astronomical Observatory of Capodimonte
Commons category
15 Eunomia
time of discovery or invention
1851-07-29
asteroid spectral type
S-type asteroid
orbital inclination
11.76143490882618
density
3.85
rotation period
6.083
albedo
0.248
surface gravity
0.137
provisional designation
A851 OA
absolute magnitude
5.42
orbital eccentricity
0.1877813307912034
semi-major axis of an orbit
2.642186113941366
periapsis
2.146032889267418
apoapsis
3.138339338615315
longitude of ascending node
292.881226497189
argument of periapsis
98.50719964830456
mean anomaly
113.7257835634999
time of periapsis
2460504.9357457487
Sources (5)

via Wikidata · CC0

~5 min read

Encyclopedic overview

15 Eunomia is a large asteroid in the middle asteroid belt. It is the largest of the stony (S-type) asteroids, with a mean diameter of about 270 kilometres (170 mi). It is between the eight and twelfth largest main belt asteroid, containing about 1% of its mass. It was discovered on 29 July 1851 by astronomer Annibale de Gasparis, who chose to name the asteroid after the Greek goddess Eunomia. It is elongated and irregular in shape, and rotates once every six hours and five minutes.

Eunomia is the largest member of the Eunomia family, one of the largest known asteroid families in the main belt. Asteroids of the Eunomia family share orbital and compositional similarities to Eunomia itself.

Excerpted from Wikipedia’s “15 Eunomia” article, available under the CC BY-SA 4.0 licence.

Gallery (3)