SpaceAtlas Space Object Data
NASA JPL SBDB · 843651

843651

843651 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.136 AU it takes 3.12 yr to circle the Sun.

Apollo Observations: 475
Orbital Period · P
3.12 yr
v(q)
54.9 km/s
v(Q)
7.6 km/s
Diameter · ≈
1.01 km
TJ
3.24
Eccentricity · e
0.7575

Orbit and dynamics

The path is an ellipse reaching 0.518 AU from the Sun at perihelion and 3.754 AU at aphelion, a radial span of 3.236 AU.

Applying Kepler's third law to a = 2.136 AU gives an orbital period of 3.12 yr, or about 1,140 days.

The high eccentricity (0.757) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 15.32° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 54.9 km/s at perihelion and falls to 7.6 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

The measured diameter is 0.68 km, a value from direct size determination rather than from brightness alone.

A geometric albedo of 0.289 points to a comparatively bright, reflective surface.

Observation record and orbit quality

The current orbit solution is based on 475 observations and has a weighted RMS residual of 0.4245 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
2.136 AU
Eccentricity
0.7575
Perihelion
0.518 AU
Aphelion
3.75402 AU
Inclination
15.32°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
36.24°

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

No close approaches to Earth are currently on record for this object.

Physical Parameters

Diameter
0.681 km
Albedo
0.289
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
17.72

Orbit Quality

RMS
0.42446
Condition
0
Orbit ID
—
Data source: NASA JPL Small-Body Database . 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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