SpaceAtlas Space Object Data
NASA JPL SBDB · 808521

808521

808521 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.42 AU it takes 1.69 yr to circle the Sun.

Apollo Observations: 153
Orbital Period · P
1.69 yr
v(q)
41.9 km/s
v(Q)
14.9 km/s
Diameter · ≈
0.48 km
TJ
4.47
Eccentricity · e
0.4751

Orbit and dynamics

Between its closest point (0.745 AU) and its farthest (2.095 AU), the heliocentric distance changes by 1.35 AU over every revolution.

One full revolution takes 1.69 yr (618 days), computed from the semi-major axis of 1.42 AU.

The high eccentricity (0.475) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 28.27° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 41.9 km/s at perihelion and falls to 14.9 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 = 19.33 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.48 km.

Observation record and orbit quality

Astrometry from 153 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5523 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
1.42 AU
Eccentricity
0.4751
Perihelion
0.745 AU
Aphelion
2.094642 AU
Inclination
28.27°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
8.05°

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
2045-Feb-08 06:35 0.155377 AU
23244076 km
22.05 km/s
2067-Jan-30 16:43 0.110080 AU
16467755 km
19.89 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
19.33

Orbit Quality

RMS
0.55226
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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