SpaceAtlas Space Object Data
NASA JPL SBDB · 866329

866329

866329 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.31 AU it takes 1.50 yr to circle the Sun.

Apollo Observations: 103
Orbital Period · P
1.50 yr
v(q)
39.3 km/s
v(Q)
17.2 km/s
Diameter · ≈
0.13 km
TJ
4.9
Eccentricity · e
0.3901

Orbit and dynamics

The path is an ellipse reaching 0.799 AU from the Sun at perihelion and 1.821 AU at aphelion, a radial span of 1.022 AU.

Applying Kepler's third law to a = 1.31 AU gives an orbital period of 1.50 yr, or about 548 days.

An eccentricity of 0.39 makes the orbit moderately elongated.

Its inclination of 0.08° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 39.3 km/s at perihelion and falls to 17.2 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 = 22.14 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.13 km.

Observation record and orbit quality

The current orbit solution is based on 103 observations and has a weighted RMS residual of 0.5819 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
1.31 AU
Eccentricity
0.3901
Perihelion
0.799 AU
Aphelion
1.821031 AU
Inclination
0.08°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
135.56°

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
2066-Apr-26 20:03 0.199954 AU
29912710 km
9.41 km/s
2069-Apr-25 21:31 0.198880 AU
29751953 km
9.38 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
22.14

Orbit Quality

RMS
0.58187
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.

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