SpaceAtlas Space Object Data
NASA JPL SBDB · 329770

329770

329770 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.356 AU it takes 1.58 yr to circle the Sun.

Apollo Observations: 705
Orbital Period · P
1.58 yr
v(q)
53.5 km/s
v(Q)
12.2 km/s
Diameter · ≈
0.92 km
TJ
4.53
Eccentricity · e
0.6286

Orbit and dynamics

The path is an ellipse reaching 0.504 AU from the Sun at perihelion and 2.208 AU at aphelion, a radial span of 1.704 AU.

Applying Kepler's third law to a = 1.356 AU gives an orbital period of 1.58 yr, or about 577 days.

The high eccentricity (0.629) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 29.59° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 53.5 km/s at perihelion and falls to 12.2 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 = 17.94 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.92 km.

Observation record and orbit quality

The current orbit solution is based on 705 observations and has a weighted RMS residual of 0.3806 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
1.356 AU
Eccentricity
0.6286
Perihelion
0.504 AU
Aphelion
2.208382 AU
Inclination
29.59°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
34.58°

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
2034-May-05 09:39 0.138045 AU
20651258 km
23.03 km/s
2064-May-04 01:16 0.144815 AU
21663965 km
22.28 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
17.94

Orbit Quality

RMS
0.38064
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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