SpaceAtlas Space Object Data
NASA JPL SBDB · 380818

380818

380818 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.923 AU and a period of 0.89 yr.

Aten Observations: 232
Orbital Period · P
0.89 yr
v(q)
54.6 km/s
v(Q)
17.6 km/s
Diameter · ≈
0.26 km
TJ
6.34
Eccentricity · e
0.5124

Orbit and dynamics

The path is an ellipse reaching 0.45 AU from the Sun at perihelion and 1.396 AU at aphelion, a radial span of 0.946 AU.

Applying Kepler's third law to a = 0.923 AU gives an orbital period of 0.89 yr, or about 324 days.

The high eccentricity (0.512) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 14.14° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 54.6 km/s at perihelion and falls to 17.6 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 = 20.67 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.26 km.

Observation record and orbit quality

The current orbit solution is based on 232 observations and has a weighted RMS residual of 0.4691 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
0.923 AU
Eccentricity
0.5124
Perihelion
0.45 AU
Aphelion
1.395945 AU
Inclination
14.14°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
97.3°

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
2044-Dec-25 00:01 0.195017 AU
29174116 km
19.87 km/s
2052-Dec-22 23:05 0.154026 AU
23041900 km
16.59 km/s
2060-Dec-24 04:54 0.181582 AU
27164338 km
14.03 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
20.67

Orbit Quality

RMS
0.46905
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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