151P/Helin is a mid-sized comet whose orbit features a relatively short period, low inclination, and is controlled by Jupiter's gravitational effects. NASA JPL has not classified 151P/Helin as potentially hazardous because its orbit does not bring it close to Earth.
151P/Helin orbits the sun every 5,110 days (13.99 years), coming as close as 2.49 AU and reaching as far as 9.12 AU from the sun. 151P/Helin is about 8.4 kilometers in diameter, making it larger than 99% of asteroids, comparable in size to the San Francisco Bay.
151P/Helin's orbit is 1.49 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.
151P/Helin's orbit is determined by observations dating back to Aug. 24, 1987. It was last officially observed on Jan. 26, 2016. The IAU Minor Planet Center records 420 observations used to determine its orbit.
The position of 151P/Helin 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.