SpaceAtlas Space Object Data
NASA JPL SBDB · 2023 HD2

2023 HD2

2023 HD2 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.833 AU it takes 4.77 yr to circle the Sun.

Apollo Observations: 25
Orbital Period · P
4.77 yr
v(q)
38.6 km/s
v(Q)
8.1 km/s
Diameter · ≈
0.02 km
TJ
2.95
Eccentricity · e
0.6529

Orbit and dynamics

The path is an ellipse reaching 0.983 AU from the Sun at perihelion and 4.683 AU at aphelion, a radial span of 3.7 AU.

Applying Kepler's third law to a = 2.833 AU gives an orbital period of 4.77 yr, or about 1,742 days.

The high eccentricity (0.653) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

Its inclination of 0.04° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 38.6 km/s at perihelion and falls to 8.1 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 = 26.39 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 25 observations and has a weighted RMS residual of 0.6653 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
2.833 AU
Eccentricity
0.6529
Perihelion
0.983 AU
Aphelion
4.682666 AU
Inclination
0.04°
Orbital Period
— yr
Epoch
2460054.5
Mean Anomaly
5.03°

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
26.39

Orbit Quality

RMS
0.66531
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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