SpaceAtlas Space Object Data
NASA JPL SBDB · 2025 WH9

2025 WH9

2025 WH9 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.101 AU it takes 1.16 yr to circle the Sun.

Apollo Observations: 31
Orbital Period · P
1.16 yr
v(q)
41.6 km/s
v(Q)
19.4 km/s
Diameter · ≈
0.16 km
TJ
5.54
Eccentricity · e
0.3644

Orbit and dynamics

Between its closest point (0.7 AU) and its farthest (1.502 AU), the heliocentric distance changes by 0.802 AU over every revolution.

One full revolution takes 1.16 yr (422 days), computed from the semi-major axis of 1.101 AU.

An eccentricity of 0.364 makes the orbit moderately elongated.

The orbital plane is tilted 17.96° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 41.6 km/s at perihelion and falls to 19.4 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 = 21.75 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.16 km.

Observation record and orbit quality

Astrometry from 31 individual observations underpins this orbit; the fit leaves an RMS residual of 0.2934 arcseconds.

Condition code U = 6 indicates a moderately constrained orbit; predictions decades ahead still carry noticeable uncertainty.

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
1.101 AU
Eccentricity
0.3644
Perihelion
0.7 AU
Aphelion
1.502204 AU
Inclination
17.96°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
309.63°

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.

Physical Parameters

Diameter
— km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
21.75

Orbit Quality

RMS
0.2934
Condition
6
Orbit ID
—
Data source: NASA JPL Small-Body Database . 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.

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