SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 AM13

2018 AM13

2018 AM13 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.445 AU it takes 1.74 yr to circle the Sun.

Apollo Observations: 83
Orbital Period · P
1.74 yr
v(q)
36.6 km/s
v(Q)
16.8 km/s
Diameter · ≈
0.13 km
TJ
4.52
Eccentricity · e
0.371

Orbit and dynamics

The path is an ellipse reaching 0.909 AU from the Sun at perihelion and 1.981 AU at aphelion, a radial span of 1.072 AU.

Applying Kepler's third law to a = 1.445 AU gives an orbital period of 1.74 yr, or about 634 days.

An eccentricity of 0.371 makes the orbit moderately elongated.

The orbital plane is tilted 19.9° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 36.6 km/s at perihelion and falls to 16.8 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 = 22.13 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.13 km.

Observation record and orbit quality

The current orbit solution is based on 83 observations and has a weighted RMS residual of 0.628 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
1.445 AU
Eccentricity
0.371
Perihelion
0.909 AU
Aphelion
1.981095 AU
Inclination
19.9°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
340.9°

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
22.13

Orbit Quality

RMS
0.62796
Condition
0
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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