SpaceAtlas Space Object Data
NASA JPL SBDB · 2008 SS

2008 SS

2008 SS is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.928 AU and a period of 0.89 yr.

Aten Observations: 90
Orbital Period · P
0.89 yr
v(q)
52.1 km/s
v(Q)
18.3 km/s
Diameter · ≈
0.13 km
TJ
6.3
Eccentricity · e
0.4792

Orbit and dynamics

Between its closest point (0.484 AU) and its farthest (1.373 AU), the heliocentric distance changes by 0.889 AU over every revolution.

One full revolution takes 0.89 yr (327 days), computed from the semi-major axis of 0.928 AU.

The high eccentricity (0.479) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 21.14° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 52.1 km/s at perihelion and falls to 18.3 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 = 22.11 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.13 km.

Observation record and orbit quality

Astrometry from 90 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3507 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
0.9285 AU
Eccentricity
0.4792
Perihelion
0.484 AU
Aphelion
1.373437 AU
Inclination
21.14°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
189.7°

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
2034-Sep-29 01:49 0.195641 AU
29267528 km
21.84 km/s
2042-Oct-04 07:06 0.116712 AU
17459857 km
14.59 km/s
2051-Sep-29 11:49 0.193474 AU
28943337 km
21.79 km/s
2059-Oct-04 11:25 0.122848 AU
18377860 km
14.48 km/s
2068-Sep-29 05:05 0.182246 AU
27263539 km
21.44 km/s
2076-Oct-03 11:01 0.136853 AU
20472979 km
14.23 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
22.11

Orbit Quality

RMS
0.35072
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.