3 Juno

Also known as Juno, (3) Juno

large asteroid in the asteroid belt, the third asteroid discovered, in 1804, by German astronomer Karl Harding

AI overview

3 Juno is a large asteroid located in the asteroid belt between Mars and Jupiter, and it was the third asteroid ever discovered when German astronomer Karl Harding found it in 1804. It matters as a significant early discovery in astronomy that helped scientists understand the structure 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

Diameter: 246.596
Mass: 28200000000000000000
Orbital period: 1594.335665347375
Image: 3 Juno VLT (2021).png

Show 19 more facts

Commons category: 3 Juno
time of discovery or invention: 1804-09-01
Unicode character: ⚵
orbital inclination: 12.98603961477441
Commons gallery: (3) Juno
density: 2.98
rotation period: 7.21
apparent magnitude: 11.61
albedo: 0.214
provisional designation: A804 RA
absolute magnitude: 5.19
orbital eccentricity: 0.2558257725543152
semi-major axis of an orbit: 2.670879058906207
periapsis: 1.987599360262385
apoapsis: 3.35415875755003
longitude of ascending node: 169.8198844530219
argument of periapsis: 247.8836661359693
mean anomaly: 217.5909617686606
time of periapsis: 2461631.188357556

Sources (3)

via Wikidata · CC0

~8 min read

Article

Juno (minor-planet designation: 3 Juno) is a large asteroid in the asteroid belt. Juno was the third asteroid discovered, in 1804, by German astronomer Karl Harding. It is tied with three other asteroids as the thirteenth largest asteroid, and it is one of the two largest stony (S-type) asteroids, along with 15 Eunomia. It is estimated to contain 1% of the total mass of the asteroid belt.

History