SpaceAtlas Space Object Data
NASA JPL SBDB · 2025 OW

2025 OW

2025 OW belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.004 AU it takes 1.01 yr to circle the Sun.

Apollo Observations: 155
Orbital Period · P
1.01 yr
v(q)
53.4 km/s
v(Q)
16.5 km/s
Diameter · ≈
0.07 km
TJ
5.83
Eccentricity · e
0.5274

Orbit and dynamics

The path is an ellipse reaching 0.475 AU from the Sun at perihelion and 1.534 AU at aphelion, a radial span of 1.059 AU.

Applying Kepler's third law to a = 1.004 AU gives an orbital period of 1.01 yr, or about 367 days.

The high eccentricity (0.527) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 29.28° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 53.4 km/s at perihelion and falls to 16.5 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 = 23.53 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.07 km.

Observation record and orbit quality

The current orbit solution is based on 155 observations and has a weighted RMS residual of 0.4082 arcseconds.

Condition code U = 0 means the orbit is very well determined, leaving only a small uncertainty in the future ephemeris.

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

Semi-Major Axis
1.004 AU
Eccentricity
0.5274
Perihelion
0.475 AU
Aphelion
1.53351 AU
Inclination
29.28°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
247.74°

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

Predicted close approaches to Earth, from NASA's Center for Near-Earth Object Studies (CNEOS).

Date (UTC)Miss distanceVelocity
2027-Jul-31 15:02 0.082413 AU
12328750 km
19.22 km/s
2028-Jul-31 20:38 0.125292 AU
18743439 km
18.36 km/s
2029-Aug-01 19:51 0.168887 AU
25265143 km
17.59 km/s

Distances in astronomical units (AU) and kilometres. Source: NASA/JPL CNEOS Close Approach Data API.

Physical Parameters

Diameter
— km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
23.53

Orbit Quality

RMS
0.4082
Condition
0
Orbit ID
—
Data source: NASA JPL Small-Body Database · NASA CNEOS. 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.

Keep exploring

Explore asteroids, comets and near-Earth objects with JPL orbital data.