SpaceAtlas Space Object Data
NASA JPL SBDB · 216523

216523

216523 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.914 AU and a period of 0.87 yr.

Aten Observations: 353
Orbital Period · P
0.87 yr
v(q)
48.3 km/s
v(Q)
20.1 km/s
Diameter · ≈
0.26 km
TJ
6.46
Eccentricity · e
0.4121

Orbit and dynamics

The path is an ellipse reaching 0.537 AU from the Sun at perihelion and 1.29 AU at aphelion, a radial span of 0.753 AU.

Applying Kepler's third law to a = 0.914 AU gives an orbital period of 0.87 yr, or about 319 days.

The high eccentricity (0.412) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 5.21° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 48.3 km/s at perihelion and falls to 20.1 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 = 20.7 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 353 observations and has a weighted RMS residual of 0.5 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
0.9137 AU
Eccentricity
0.4121
Perihelion
0.537 AU
Aphelion
1.290236 AU
Inclination
5.21°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
47.12°

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
2035-Mar-28 04:43 0.167656 AU
25081052 km
16.78 km/s
2042-Mar-25 12:47 0.094231 AU
14096801 km
14.45 km/s
2049-Mar-24 00:08 0.047458 AU
7099544 km
12.77 km/s
2056-Mar-23 08:46 0.034814 AU
5208144 km
11.85 km/s
2063-Mar-24 01:22 0.040871 AU
6114254 km
11.21 km/s
2070-Mar-24 05:12 0.064095 AU
9588430 km
10.34 km/s
2077-Mar-26 11:02 0.107911 AU
16143205 km
9.27 km/s
2078-Jun-27 19:31 0.197900 AU
29605429 km
8.36 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
20.7

Orbit Quality

RMS
0.50001
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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