SpaceAtlas Space Object Data
NASA JPL SBDB · 2012 HH8

2012 HH8

2012 HH8 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.497 AU it takes 1.83 yr to circle the Sun.

Apollo Observations: 104
Orbital Period · P
1.83 yr
v(q)
63.8 km/s
v(Q)
9.3 km/s
Diameter · ≈
0.22 km
TJ
4.07
Eccentricity · e
0.7459

Orbit and dynamics

The path is an ellipse reaching 0.38 AU from the Sun at perihelion and 2.614 AU at aphelion, a radial span of 2.234 AU.

Applying Kepler's third law to a = 1.497 AU gives an orbital period of 1.83 yr, or about 669 days.

The high eccentricity (0.746) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 33.82° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 63.8 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 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.22 km.

Observation record and orbit quality

The current orbit solution is based on 104 observations and has a weighted RMS residual of 0.4917 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
1.497 AU
Eccentricity
0.7459
Perihelion
0.38 AU
Aphelion
2.613612 AU
Inclination
33.82°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
289.75°

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-Apr-02 21:02 0.159005 AU
23786772 km
25.55 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
21.0

Orbit Quality

RMS
0.49169
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.

Keep exploring

Explore asteroids, comets and near-Earth objects with JPL orbital data.