SpaceAtlas Space Object Data
NASA JPL SBDB · 390522

390522

390522 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.186 AU it takes 1.29 yr to circle the Sun.

Apollo Observations: 120
Orbital Period · P
1.29 yr
v(q)
39.5 km/s
v(Q)
18.9 km/s
Diameter · ≈
0.33 km
TJ
5.24
Eccentricity · e
0.3526

Orbit and dynamics

The path is an ellipse reaching 0.768 AU from the Sun at perihelion and 1.604 AU at aphelion, a radial span of 0.836 AU.

Applying Kepler's third law to a = 1.186 AU gives an orbital period of 1.29 yr, or about 472 days.

An eccentricity of 0.353 makes the orbit moderately elongated.

The orbital plane is tilted 18.38° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 39.5 km/s at perihelion and falls to 18.9 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 = 20.18 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.33 km.

Observation record and orbit quality

The current orbit solution is based on 120 observations and has a weighted RMS residual of 0.6667 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
1.186 AU
Eccentricity
0.3526
Perihelion
0.768 AU
Aphelion
1.604184 AU
Inclination
18.38°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
42.35°

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
2027-May-16 04:11 0.124549 AU
18632340 km
13.18 km/s
2032-Nov-17 22:28 0.169969 AU
25427010 km
18.08 km/s
2054-Oct-28 09:19 0.138516 AU
20721722 km
12.26 km/s
2058-May-15 07:08 0.122893 AU
18384476 km
14.32 km/s
2063-Nov-14 20:17 0.109727 AU
16414883 km
16.41 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
20.18

Orbit Quality

RMS
0.66667
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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