SpaceAtlas Space Object Data
NASA JPL SBDB · 2008 HT4

2008 HT4

2008 HT4 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.414 AU once every 1.68 yr.

Amor Observations: 21
Orbital Period · P
1.68 yr
v(q)
31.6 km/s
v(Q)
19.8 km/s
Diameter · ≈
0.08 km
TJ
4.65
Eccentricity · e
0.2293

Orbit and dynamics

The path is an ellipse reaching 1.09 AU from the Sun at perihelion and 1.738 AU at aphelion, a radial span of 0.648 AU.

Applying Kepler's third law to a = 1.414 AU gives an orbital period of 1.68 yr, or about 614 days.

An eccentricity of 0.229 makes the orbit moderately elongated.

The orbital plane is tilted 16.69° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 31.6 km/s at perihelion and falls to 19.8 km/s at aphelion.

Its perihelion lies just outside Earth's orbit, which is why it is classed as Earth-approaching rather than Earth-crossing.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 23.2 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.08 km.

Observation record and orbit quality

The current orbit solution is based on 21 observations and has a weighted RMS residual of 0.4251 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
1.414 AU
Eccentricity
0.2293
Perihelion
1.09 AU
Aphelion
1.73823 AU
Inclination
16.69°
Orbital Period
— yr
Epoch
2454588.5
Mean Anomaly
27.85°

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
23.2

Orbit Quality

RMS
0.42514
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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