SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 AA12

2018 AA12

2018 AA12 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.528 AU it takes 1.89 yr to circle the Sun.

Apollo Observations: 37
Orbital Period · P
1.89 yr
v(q)
35.3 km/s
v(Q)
16.4 km/s
Diameter · ≈
0.04 km
TJ
4.41
Eccentricity · e
0.3652

Orbit and dynamics

The path is an ellipse reaching 0.97 AU from the Sun at perihelion and 2.086 AU at aphelion, a radial span of 1.116 AU.

Applying Kepler's third law to a = 1.528 AU gives an orbital period of 1.89 yr, or about 690 days.

An eccentricity of 0.365 makes the orbit moderately elongated.

The orbital plane is tilted 7.28° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 35.3 km/s at perihelion and falls to 16.4 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 = 24.86 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.04 km.

Observation record and orbit quality

The current orbit solution is based on 37 observations and has a weighted RMS residual of 0.8711 arcseconds.

Condition code U = 7 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
1.528 AU
Eccentricity
0.3652
Perihelion
0.97 AU
Aphelion
2.086026 AU
Inclination
7.28°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
145.58°

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
24.86

Orbit Quality

RMS
0.87112
Condition
7
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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