12307 (1991 UA) is a mid-sized asteroid that orbits between Mars and Jupiter in the outer reaches of the main asteroid belt. NASA JPL has not classified 1991 UA as potentially hazardous because its orbit does not bring it close to Earth.
1991 UA orbits the sun every 2,920 days (7.99 years), coming as close as 2.98 AU and reaching as far as 5.02 AU from the sun. Based on its brightness and the way it reflects light, 1991 UA is probably between 6.615 to 14.792 kilometers in diameter, making it larger than 99% of asteroids, very roughly comparable in size to the San Francisco Bay.
The rotation of 1991 UA has been observed. It completes a rotation on its axis every 3.72 hours.
1991 UA's orbit is 1.98 AU from Earth's orbit at its closest point. This means that there is an extremely wide berth between this asteroid and Earth at all times.
Orbital simulations conducted by NASA JPL's CNEOS do not show any close approaches to Earth.
1991 UA's orbit is determined by observations dating back to Sept. 13, 1991. It was last officially observed on Dec. 15, 2022. The IAU Minor Planet Center records 1,779 observations used to determine its orbit.
The position of 12307 (1991 UA) is indicated by a ◯ pink circle. Note that the object may not be in your current field of view. Use the controls below to adjust position, location, and time.