SpaceAtlas Space Object Data
NASA JPL SBDB · 668727

668727

668727 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.232 AU it takes 1.37 yr to circle the Sun.

Apollo Observations: 113
Orbital Period · P
1.37 yr
v(q)
40.8 km/s
v(Q)
17.7 km/s
Diameter · ≈
0.33 km
TJ
5.09
Eccentricity · e
0.3959

Orbit and dynamics

The path is an ellipse reaching 0.744 AU from the Sun at perihelion and 1.72 AU at aphelion, a radial span of 0.976 AU.

Applying Kepler's third law to a = 1.232 AU gives an orbital period of 1.37 yr, or about 499 days.

An eccentricity of 0.396 makes the orbit moderately elongated.

The orbital plane is tilted 13.44° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 40.8 km/s at perihelion and falls to 17.7 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 = 20.15 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.33 km.

Observation record and orbit quality

The current orbit solution is based on 113 observations and has a weighted RMS residual of 0.6838 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
1.232 AU
Eccentricity
0.3959
Perihelion
0.744 AU
Aphelion
1.719749 AU
Inclination
13.44°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
8.01°

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
20.15

Orbit Quality

RMS
0.68379
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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