2025 OS13
2025 OS13 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.519 AU it takes 1.87 yr to circle the Sun.
Orbit and dynamics
The path is an ellipse reaching 0.651 AU from the Sun at perihelion and 2.387 AU at aphelion, a radial span of 1.736 AU.
Applying Kepler's third law to a = 1.519 AU gives an orbital period of 1.87 yr, or about 684 days.
The high eccentricity (0.571) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.
Its inclination of 4.6° keeps it close to the plane of the ecliptic.
By the vis-viva equation its orbital speed rises to 46.3 km/s at perihelion and falls to 12.6 km/s at aphelion.
Because q < 1 AU and Q > 1 AU, this orbit geometrically intersects the region of Earth's orbit.
Size and surface
No direct size measurement is available; from an absolute magnitude of H = 22.57 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.11 km.
Observation record and orbit quality
The current orbit solution is based on 56 observations and has a weighted RMS residual of 0.4988 arcseconds.
Condition code U = 8 signals a poorly constrained orbit, so its future path should be treated as provisional.
About these computed values
Orbital periods, perihelion and aphelion speeds, and diameter estimates on this page are computed by SpaceAtlas from the JPL SBDB orbital elements. They are derived quantities, not values copied from the source catalogue.
Orbital Parameters
Orbit diagram
The Sun sits at the focus (orange). Earth's orbit is the grey circle at 1 AU. The red dot marks the object's position at the catalog epoch.
3D orbit (interactive)
Drag to rotate; scroll or pinch to zoom. The Sun is at the focus (orange), Earth's orbit is the grey ring at 1 AU, and the red dot marks the object's current position.
Close approaches
No close approaches to Earth are currently on record for this object.
