SpaceAtlas Space Object Data
NASA JPL SBDB · 781912

781912

781912 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 2.329 AU once every 3.55 yr.

Amor Observations: 711
Orbital Period · P
3.55 yr
v(q)
35.4 km/s
v(Q)
10.8 km/s
Diameter · ≈
0.81 km
TJ
3.36
Eccentricity · e
0.5331

Orbit and dynamics

The path is an ellipse reaching 1.087 AU from the Sun at perihelion and 3.571 AU at aphelion, a radial span of 2.484 AU.

Applying Kepler's third law to a = 2.329 AU gives an orbital period of 3.55 yr, or about 1,298 days.

The high eccentricity (0.533) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 7.2° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 35.4 km/s at perihelion and falls to 10.8 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 = 18.21 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.81 km.

Observation record and orbit quality

The current orbit solution is based on 711 observations and has a weighted RMS residual of 0.3793 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
2.329 AU
Eccentricity
0.5331
Perihelion
1.087 AU
Aphelion
3.57059 AU
Inclination
7.2°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
216.2°

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
2052-Oct-23 22:57 0.146437 AU
21906618 km
9.07 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
18.21

Orbit Quality

RMS
0.37933
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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