SpaceAtlas Space Object Data
NASA JPL SBDB · 2008 ST

2008 ST

2008 ST is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.963 AU and a period of 0.95 yr.

Aten Observations: 49
Orbital Period · P
0.95 yr
v(q)
34.4 km/s
v(Q)
26.7 km/s
Diameter · ≈
0.01 km
TJ
6.26
Eccentricity · e
0.1262

Orbit and dynamics

The path is an ellipse reaching 0.842 AU from the Sun at perihelion and 1.085 AU at aphelion, a radial span of 0.243 AU.

Applying Kepler's third law to a = 0.963 AU gives an orbital period of 0.95 yr, or about 345 days.

An eccentricity of 0.126 makes the orbit moderately elongated.

Its inclination of 1.87° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 34.4 km/s at perihelion and falls to 26.7 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 = 27.1 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

The current orbit solution is based on 49 observations and has a weighted RMS residual of 0.4571 arcseconds.

Condition code U = 5 indicates a moderately constrained orbit; predictions decades ahead still carry noticeable uncertainty.

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
0.9632 AU
Eccentricity
0.1262
Perihelion
0.842 AU
Aphelion
1.084756 AU
Inclination
1.87°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
148.8°

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
2027-Sep-12 04:10 0.419963 AU
62825572 km
16.34 km/s
2041-May-30 15:39 0.268065 AU
40101907 km
12.39 km/s
2043-Sep-25 03:49 0.068967 AU
10317292 km
6.83 km/s
2044-Sep-08 12:25 0.422142 AU
63151504 km
17.32 km/s
2057-Jun-05 21:33 0.398771 AU
59655285 km
16.55 km/s
2058-May-21 07:16 0.053279 AU
7970414 km
6.16 km/s
2059-Sep-25 22:04 0.001196 AU
178936 km
3.03 km/s
2060-Sep-16 20:34 0.003328 AU
497800 km
11.18 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
27.1

Orbit Quality

RMS
0.45709
Condition
5
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.

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