Helena is a large asteroid orbiting between Mars and Jupiter in the main portion of the asteroid belt. NASA JPL has not classified Helena as potentially hazardous because its orbit does not bring it close to Earth.
Helena orbits the sun every 1,520 days (4.16 years), coming as close as 2.22 AU and reaching as far as 2.95 AU from the sun. Helena is about 65.8 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the U.S. state of Rhode Island.
The rotation of Helena has been observed. It completes a rotation on its axis every 23.08 hours.
Helena's orbit is 1.21 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.
Helena's orbit is determined by observations dating back to March 22, 1871. It was last officially observed on July 10, 2022. The IAU Minor Planet Center records 2,667 observations used to determine its orbit.
The position of Helena 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.