SpaceAtlas Space Object Data
NASA JPL SBDB · 2012 HN

2012 HN

2012 HN belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.05 AU it takes 1.08 yr to circle the Sun.

Apollo Observations: 21
Orbital Period · P
1.08 yr
v(q)
36.9 km/s
v(Q)
22.9 km/s
Diameter · ≈
0.06 km
TJ
5.75
Eccentricity · e
0.2327

Orbit and dynamics

The path is an ellipse reaching 0.805 AU from the Sun at perihelion and 1.294 AU at aphelion, a radial span of 0.489 AU.

Applying Kepler's third law to a = 1.05 AU gives an orbital period of 1.08 yr, or about 393 days.

An eccentricity of 0.233 makes the orbit moderately elongated.

A steep inclination of 25.14° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 36.9 km/s at perihelion and falls to 22.9 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 = 24 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.06 km.

Observation record and orbit quality

The current orbit solution is based on 21 observations and has a weighted RMS residual of 0.403 arcseconds.

Condition code U = 8 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
1.05 AU
Eccentricity
0.2327
Perihelion
0.805 AU
Aphelion
1.294335 AU
Inclination
25.14°
Orbital Period
— yr
Epoch
2456034.5
Mean Anomaly
74.69°

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
24.0

Orbit Quality

RMS
0.40302
Condition
8
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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