SpaceAtlas Space Object Data
NASA JPL SBDB · 666220

666220

666220 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.952 AU and a period of 0.93 yr.

Aten Observations: 264
Orbital Period · P
0.93 yr
v(q)
39.4 km/s
v(Q)
23.7 km/s
Diameter · ≈
0.16 km
TJ
6.28
Eccentricity · e
0.2485

Orbit and dynamics

Between its closest point (0.715 AU) and its farthest (1.188 AU), the heliocentric distance changes by 0.473 AU over every revolution.

One full revolution takes 0.93 yr (339 days), computed from the semi-major axis of 0.952 AU.

An eccentricity of 0.248 makes the orbit moderately elongated.

The orbital plane is tilted 11.06° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 39.4 km/s at perihelion and falls to 23.7 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 = 21.73 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.16 km.

Observation record and orbit quality

Astrometry from 264 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5051 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
0.9516 AU
Eccentricity
0.2485
Perihelion
0.715 AU
Aphelion
1.188073 AU
Inclination
11.06°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
347.52°

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
2036-Jan-28 03:29 0.148961 AU
22284235 km
7.69 km/s
2049-Jan-26 21:35 0.147103 AU
22006318 km
7.68 km/s
2062-Jan-29 01:22 0.153619 AU
22981068 km
7.68 km/s
2074-Jan-09 20:32 0.182092 AU
27240531 km
13.16 km/s
2075-Feb-13 13:24 0.199009 AU
29771249 km
7.83 km/s
2076-May-26 11:49 0.183994 AU
27525170 km
8.24 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
21.73

Orbit Quality

RMS
0.50515
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

Explore asteroids, comets and near-Earth objects with JPL orbital data.