Asteroid Juno
3 Juno, the third asteroid to be discovered, was first observed by Astronomer Karl Ludwig Harding, on September 1, 1804.[1]
Though it was the third to be discovered, Juno is the tenth most massive asteroid.[2] Its diameter is 234 kilometres (145 mi).[3]
Jupiter takes 1590 days to orbit Sol, our sun.[4]
References
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Anton Petrov (2025-05-31). "Holy Cow, Someone Named a Minor Planet After Me! But Why?". What da Math. Retrieved 2026-06-19 – via YouTube.
My name is Anton and in this video, we will talk about 660391 Antonpetrov and why this even happened
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"Asteroid Juno Grabs the Spotlight". NASA Jet Propulsion Laboratory. 2009-09-16. Retrieved 2026-06-19.
Though pockmarked by bang-ups with other asteroids, Juno is large; in fact, it is the tenth largest asteroid. It measures about 234 kilometers (145 miles) in diameter, or about one-fifteenth the diameter of the moon.
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"Asteroid Juno has a "bite" out of it". SpaceNews. 2003-08-06. Retrieved 2026-06-19.
Juno, the third asteroid ever discovered, was first spotted by astronomers early in the 19th century. It orbits the Sun with thousands of other bits of space rock in the main asteroid belt between Mars and Jupiter. One of the largest asteroids, at a size of 150 miles across, Juno essentially is a leftover building block of the solar system.
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"Asteroid Juno: Space Reference". Space Reference. Archived from the original on 2026-02-13. Retrieved 2026-06-19.
Juno orbits the sun every 1,590 days (4.35 years), coming as close as 1.99 AU and reaching as far as 3.35 AU from the sun. Juno is about 246.6 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the U.S. state of Maryland.