SpaceAtlas Space Object Data
NASA JPL SBDB · 54660

54660

54660 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.477 AU once every 1.80 yr.

Amor Observations: 920
Orbital Period · P
1.80 yr
v(q)
32.7 km/s
v(Q)
18.4 km/s
Diameter · ≈
0.93 km
TJ
4.23
Eccentricity · e
0.2806

Orbit and dynamics

The path is an ellipse reaching 1.062 AU from the Sun at perihelion and 1.891 AU at aphelion, a radial span of 0.829 AU.

Applying Kepler's third law to a = 1.477 AU gives an orbital period of 1.80 yr, or about 656 days.

An eccentricity of 0.281 makes the orbit moderately elongated.

A steep inclination of 46.69° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 32.7 km/s at perihelion and falls to 18.4 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 = 17.92 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.93 km.

Observation record and orbit quality

The current orbit solution is based on 920 observations and has a weighted RMS residual of 0.5511 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
1.477 AU
Eccentricity
0.2806
Perihelion
1.062 AU
Aphelion
1.891446 AU
Inclination
46.69°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
96.85°

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
2070-Nov-10 10:26 0.169769 AU
25397120 km
25.74 km/s
2079-Nov-05 22:01 0.089412 AU
13375816 km
24.88 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
17.92

Orbit Quality

RMS
0.55113
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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