SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 KJ

2018 KJ

2018 KJ belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.224 AU it takes 1.35 yr to circle the Sun.

Apollo Observations: 18
Orbital Period · P
1.35 yr
v(q)
36.5 km/s
v(Q)
19.9 km/s
Diameter · ≈
0.01 km
TJ
5.16
Eccentricity · e
0.2938

Orbit and dynamics

The path is an ellipse reaching 0.864 AU from the Sun at perihelion and 1.584 AU at aphelion, a radial span of 0.72 AU.

Applying Kepler's third law to a = 1.224 AU gives an orbital period of 1.35 yr, or about 495 days.

An eccentricity of 0.294 makes the orbit moderately elongated.

The orbital plane is tilted 11.45° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 36.5 km/s at perihelion and falls to 19.9 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 = 27 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

The current orbit solution is based on 18 observations and has a weighted RMS residual of 0.7763 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
1.224 AU
Eccentricity
0.2938
Perihelion
0.864 AU
Aphelion
1.583611 AU
Inclination
11.45°
Orbital Period
— yr
Epoch
2458255.5
Mean Anomaly
46.27°

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
27.0

Orbit Quality

RMS
0.77634
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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