SpaceAtlas Space Object Data
NASA JPL SBDB · 663927

663927

663927 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.281 AU it takes 1.45 yr to circle the Sun.

Apollo Observations: 132
Orbital Period · P
1.45 yr
v(q)
38.3 km/s
v(Q)
18.1 km/s
Diameter · ≈
0.33 km
TJ
4.96
Eccentricity · e
0.3572

Orbit and dynamics

Between its closest point (0.823 AU) and its farthest (1.739 AU), the heliocentric distance changes by 0.916 AU over every revolution.

One full revolution takes 1.45 yr (530 days), computed from the semi-major axis of 1.281 AU.

An eccentricity of 0.357 makes the orbit moderately elongated.

The orbital plane is tilted 15.62° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 38.3 km/s at perihelion and falls to 18.1 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

Astrometry from 132 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5807 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
1.281 AU
Eccentricity
0.3572
Perihelion
0.823 AU
Aphelion
1.738573 AU
Inclination
15.62°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
134.33°

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
2037-Jul-28 10:43 0.148154 AU
22163571 km
12.42 km/s
2066-Jul-09 09:16 0.174818 AU
26152395 km
12.26 km/s
2079-Aug-12 04:20 0.163546 AU
24466134 km
13.46 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
20.15

Orbit Quality

RMS
0.58073
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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