SpaceAtlas Space Object Data
NASA JPL SBDB · 413021

413021

413021 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 2.294 AU once every 3.47 yr.

Amor Observations: 177
Orbital Period · P
3.47 yr
v(q)
32.2 km/s
v(Q)
12 km/s
Diameter · ≈
0.46 km
TJ
3.44
Eccentricity · e
0.4572

Orbit and dynamics

The path is an ellipse reaching 1.245 AU from the Sun at perihelion and 3.343 AU at aphelion, a radial span of 2.098 AU.

Applying Kepler's third law to a = 2.294 AU gives an orbital period of 3.47 yr, or about 1,269 days.

The high eccentricity (0.457) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 7.67° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 32.2 km/s at perihelion and falls to 12 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 = 19.45 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.46 km.

Observation record and orbit quality

The current orbit solution is based on 177 observations and has a weighted RMS residual of 0.5211 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
2.294 AU
Eccentricity
0.4572
Perihelion
1.245 AU
Aphelion
3.342817 AU
Inclination
7.67°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
131.14°

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
2066-Oct-07 02:54 0.479645 AU
71753918 km
4.03 km/s
2073-Oct-26 20:52 0.286635 AU
42879919 km
4.73 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
19.45

Orbit Quality

RMS
0.52108
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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