SpaceAtlas Space Object Data
NASA JPL SBDB · 878008

878008

878008 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.797 AU it takes 4.68 yr to circle the Sun.

Apollo Observations: 254
Orbital Period · P
4.68 yr
v(q)
53.3 km/s
v(Q)
5.9 km/s
Diameter · ≈
0.51 km
TJ
2.7
Eccentricity · e
0.7995

Orbit and dynamics

The path is an ellipse reaching 0.561 AU from the Sun at perihelion and 5.033 AU at aphelion, a radial span of 4.472 AU.

Applying Kepler's third law to a = 2.797 AU gives an orbital period of 4.68 yr, or about 1,709 days.

The high eccentricity (0.799) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 17.67° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 53.3 km/s at perihelion and falls to 5.9 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 = 19.21 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.51 km.

Observation record and orbit quality

The current orbit solution is based on 254 observations and has a weighted RMS residual of 0.4638 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
2.797 AU
Eccentricity
0.7995
Perihelion
0.561 AU
Aphelion
5.033202 AU
Inclination
17.67°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
34.49°

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
— km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
19.21

Orbit Quality

RMS
0.46382
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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