Sirene is a mid-sized asteroid with an orbit that crosses the orbit of Mars. NASA JPL has not classified Sirene as potentially hazardous because its orbit does not bring it close to Earth.
Sirene orbits the sun every 1,560 days (4.27 years), coming as close as 1.44 AU and reaching as far as 3.82 AU from the sun. Based on its brightness and the way it reflects light, Sirene is probably between 4.331 to 9.684 kilometers in diameter, making it larger than 99% of asteroids, very roughly comparable in size to the San Francisco Bay.
Sirene's orbit is 0.45 AU from Earth's orbit at its closest point. This means that there is an 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.
Sirene's orbit is determined by observations dating back to Oct. 31, 1923. It was last officially observed on Aug. 9, 2021. The IAU Minor Planet Center records 1,022 observations used to determine its orbit.
The position of Sirene 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.
The above comparison is an artistic rendering that uses available data on the diameter of Sirene to create an approximate landscape rendering with Mount Everest in the background. This approximation is built for full-resolution desktop browsers. Shape, color, and texture of asteroid are imagined.