SpaceAtlas Space Object Data
NASA JPL SBDB · 523781

523781

523781 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.662 AU once every 2.14 yr.

Amor Observations: 128
Orbital Period · P
2.14 yr
v(q)
31.1 km/s
v(Q)
17.2 km/s
Diameter · ≈
0.37 km
TJ
4.19
Eccentricity · e
0.2894

Orbit and dynamics

The path is an ellipse reaching 1.181 AU from the Sun at perihelion and 2.143 AU at aphelion, a radial span of 0.962 AU.

Applying Kepler's third law to a = 1.662 AU gives an orbital period of 2.14 yr, or about 783 days.

An eccentricity of 0.289 makes the orbit moderately elongated.

The orbital plane is tilted 12.63° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 31.1 km/s at perihelion and falls to 17.2 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 = 19.93 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 128 observations and has a weighted RMS residual of 0.4535 arcseconds.

Condition code U = 1 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
1.662 AU
Eccentricity
0.2894
Perihelion
1.181 AU
Aphelion
2.142983 AU
Inclination
12.63°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
120.03°

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
2030-Mar-11 15:49 0.444287 AU
66464433 km
5.90 km/s
2031-Dec-29 19:05 0.442474 AU
66193157 km
5.31 km/s
2045-Mar-18 19:14 0.479852 AU
71784799 km
5.46 km/s
2047-Jan-08 08:33 0.405685 AU
60689659 km
6.34 km/s
2062-Jan-15 09:53 0.368580 AU
55138816 km
6.96 km/s
2077-Jan-19 15:56 0.338503 AU
50639324 km
7.17 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
19.93

Orbit Quality

RMS
0.45353
Condition
1
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

Explore asteroids, comets and near-Earth objects with JPL orbital data.