1I/`Oumuamua

Designation

1I/`Oumuamua was the first-ever interstellar object detected in our Solar System. It was discovered initially in October 2017 by the Pan-STARRS telescope at Haleakalā Observatory in Hawai`i, and, as the first of a new category of object, was named for the Hawai`ian word for "scout."

At the time of its discovery, it had already made its closest pass to the Sun. 'Oumuamua is very small — only a few hundred meters in length — and by December 2017, it was already too faint for even the most powerful ground-based telescopes to observe. It passed the orbit of Neptune in 2022 and is on its way out of our Solar System.

Diameter

0.50km 0.31mi

This object compared to other %category%

Average distance from the Sun

Semi-major axis (a)

Deviation from a circular orbit

Eccentricity (e)

Angle of orbit

Inclination (i)

Orbital elements

When will it be closest to the Sun?

days left

How far is it today?

From the Sun

1.00au

From the Earth