SpaceAtlas Space Object Data
NASA JPL SBDB · 329915

329915

329915 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.986 AU and a period of 0.98 yr.

Aten Observations: 200
Orbital Period · P
0.98 yr
v(q)
88.3 km/s
v(Q)
10.2 km/s
Diameter · ≈
1.38 km
TJ
5.68
Eccentricity · e
0.793

Orbit and dynamics

Between its closest point (0.204 AU) and its farthest (1.767 AU), the heliocentric distance changes by 1.563 AU over every revolution.

One full revolution takes 0.98 yr (357 days), computed from the semi-major axis of 0.986 AU.

The high eccentricity (0.793) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 41.36° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 88.3 km/s at perihelion and falls to 10.2 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

The measured diameter is 1.01 km, a value from direct size determination rather than from brightness alone.

A geometric albedo of 0.249 points to a comparatively bright, reflective surface.

Observation record and orbit quality

Astrometry from 200 individual observations underpins this orbit; the fit leaves an RMS residual of 0.6141 arcseconds.

Condition code U = 1 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
0.9855 AU
Eccentricity
0.793
Perihelion
0.204 AU
Aphelion
1.767002 AU
Inclination
41.36°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
252.99°

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
1.012 km
Albedo
0.249
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
17.05

Orbit Quality

RMS
0.61409
Condition
1
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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