SpaceAtlas Space Object Data
NASA JPL SBDB · 2008 AH4

2008 AH4

2008 AH4 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.292 AU it takes 3.47 yr to circle the Sun.

Apollo Observations: 35
Orbital Period · P
3.47 yr
v(q)
41.7 km/s
v(Q)
9.3 km/s
Diameter · ≈
0.17 km
TJ
2.67
Eccentricity · e
0.6367

Orbit and dynamics

The path is an ellipse reaching 0.833 AU from the Sun at perihelion and 3.751 AU at aphelion, a radial span of 2.918 AU.

Applying Kepler's third law to a = 2.292 AU gives an orbital period of 3.47 yr, or about 1,267 days.

The high eccentricity (0.637) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 67.3° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 41.7 km/s at perihelion and falls to 9.3 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 = 21.59 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.17 km.

Observation record and orbit quality

The current orbit solution is based on 35 observations and has a weighted RMS residual of 0.4905 arcseconds.

Condition code U = 9 signals a poorly constrained orbit, so its future path should be treated as provisional.

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
2.292 AU
Eccentricity
0.6367
Perihelion
0.833 AU
Aphelion
3.751316 AU
Inclination
67.3°
Orbital Period
— yr
Epoch
2454479.5
Mean Anomaly
347.22°

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

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
21.59

Orbit Quality

RMS
0.4905
Condition
9
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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