SpaceAtlas Space Object Data
NASA JPL SBDB · 2006 HE2

2006 HE2

2006 HE2 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.065 AU it takes 1.10 yr to circle the Sun.

Apollo Observations: 36
Orbital Period · P
1.10 yr
v(q)
33.8 km/s
v(Q)
24.6 km/s
Diameter · ≈
0.02 km
TJ
5.78
Eccentricity · e
0.1568

Orbit and dynamics

The path is an ellipse reaching 0.898 AU from the Sun at perihelion and 1.232 AU at aphelion, a radial span of 0.334 AU.

Applying Kepler's third law to a = 1.065 AU gives an orbital period of 1.10 yr, or about 401 days.

An eccentricity of 0.157 makes the orbit moderately elongated.

Its inclination of 1.18° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 33.8 km/s at perihelion and falls to 24.6 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 = 26.5 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

The current orbit solution is based on 36 observations and has a weighted RMS residual of 0.4156 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
1.065 AU
Eccentricity
0.1568
Perihelion
0.898 AU
Aphelion
1.231992 AU
Inclination
1.18°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
54.22°

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
2028-Apr-13 04:59 0.144273 AU
21582947 km
10.10 km/s
2029-Jan-24 09:21 0.240090 AU
35917019 km
5.51 km/s
2029-Sep-30 01:00 0.004431 AU
662851 km
4.77 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
26.5

Orbit Quality

RMS
0.41561
Condition
6
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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