SpaceAtlas Space Object Data
NASA JPL SBDB · 2009 SS

2009 SS

2009 SS is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.908 AU and a period of 0.86 yr.

Aten Observations: 12
Orbital Period · P
0.86 yr
v(q)
38.3 km/s
v(Q)
25.5 km/s
Diameter · ≈
0.02 km
TJ
6.54
Eccentricity · e
0.2012

Orbit and dynamics

The path is an ellipse reaching 0.725 AU from the Sun at perihelion and 1.09 AU at aphelion, a radial span of 0.365 AU.

Applying Kepler's third law to a = 0.908 AU gives an orbital period of 0.86 yr, or about 316 days.

An eccentricity of 0.201 makes the orbit moderately elongated.

The orbital plane is tilted 9.53° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 38.3 km/s at perihelion and falls to 25.5 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 = 26.7 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

The current orbit solution is based on 12 observations and has a weighted RMS residual of 0.7613 arcseconds.

Condition code U = 9 signals a poorly constrained orbit, so its future path should be treated as provisional.

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
0.9076 AU
Eccentricity
0.2012
Perihelion
0.725 AU
Aphelion
1.090209 AU
Inclination
9.53°
Orbital Period
— yr
Epoch
2455091.5
Mean Anomaly
210.98°

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
26.7

Orbit Quality

RMS
0.76133
Condition
9
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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