SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 AH13

2018 AH13

2018 AH13 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.253 AU once every 1.40 yr.

Amor Observations: 57
Orbital Period · P
1.40 yr
v(q)
30.2 km/s
v(Q)
23.5 km/s
Diameter · ≈
0.05 km
TJ
5.09
Eccentricity · e
0.1251

Orbit and dynamics

Between its closest point (1.097 AU) and its farthest (1.41 AU), the heliocentric distance changes by 0.313 AU over every revolution.

One full revolution takes 1.40 yr (512 days), computed from the semi-major axis of 1.253 AU.

An eccentricity of 0.125 makes the orbit moderately elongated.

The orbital plane is tilted 15.15° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 30.2 km/s at perihelion and falls to 23.5 km/s at aphelion.

Its perihelion lies just outside Earth's orbit, which is why it is classed as Earth-approaching rather than Earth-crossing.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 24.18 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.05 km.

Observation record and orbit quality

Astrometry from 57 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5108 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
1.253 AU
Eccentricity
0.1251
Perihelion
1.097 AU
Aphelion
1.40975 AU
Inclination
15.15°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
332.21°

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

Predicted close approaches to Earth, from NASA's Center for Near-Earth Object Studies (CNEOS).

Date (UTC)Miss distanceVelocity
2032-Jan-18 09:38 0.181809 AU
27198223 km
7.99 km/s

Distances in astronomical units (AU) and kilometres. Source: NASA/JPL CNEOS Close Approach Data API.

Physical Parameters

Diameter
— km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
24.18

Orbit Quality

RMS
0.51077
Condition
0
Orbit ID
—
Data source: NASA JPL Small-Body Database · NASA CNEOS. 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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