SpaceAtlas Space Object Data
NASA JPL SBDB · 204131

204131

204131 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.147 AU it takes 1.23 yr to circle the Sun.

Apollo Observations: 376
Orbital Period · P
1.23 yr
v(q)
58.7 km/s
v(Q)
13.2 km/s
Diameter · ≈
0.37 km
TJ
5.26
Eccentricity · e
0.6325

Orbit and dynamics

The path is an ellipse reaching 0.421 AU from the Sun at perihelion and 1.872 AU at aphelion, a radial span of 1.451 AU.

Applying Kepler's third law to a = 1.147 AU gives an orbital period of 1.23 yr, or about 449 days.

The high eccentricity (0.632) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 5.65° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 58.7 km/s at perihelion and falls to 13.2 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 = 19.94 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.37 km.

Observation record and orbit quality

The current orbit solution is based on 376 observations and has a weighted RMS residual of 0.4007 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
1.147 AU
Eccentricity
0.6325
Perihelion
0.421 AU
Aphelion
1.872477 AU
Inclination
5.65°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
169.01°

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
2041-Dec-16 22:52 0.126174 AU
18875405 km
24.43 km/s
2050-Apr-11 22:11 0.099474 AU
14881115 km
21.29 km/s
2057-Dec-10 05:34 0.086464 AU
12934849 km
18.84 km/s
2077-Apr-17 08:39 0.168901 AU
25267206 km
16.87 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
19.94

Orbit Quality

RMS
0.4007
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.

Keep exploring

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