Mamoru is a large asteroid orbiting between Mars and Jupiter in the main portion of the asteroid belt. NASA JPL has not classified Mamoru as potentially hazardous because its orbit does not bring it close to Earth.
Mamoru orbits the sun every 1,590 days (4.35 years), coming as close as 1.86 AU and reaching as far as 3.47 AU from the sun. Mamoru is about 10.9 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the city of Boston.
The rotation of Mamoru has been observed. It completes a rotation on its axis every 5.39 hours.
Mamoru's orbit is 0.89 AU from Earth's orbit at its closest point. This means that there is a very 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.
Mamoru's orbit is determined by observations dating back to Sept. 6, 1929. It was last officially observed on June 16, 2023. The IAU Minor Planet Center records 4,025 observations used to determine its orbit.
The position of Mamoru 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.