SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 SA

2015 SA

2015 SA is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.841 AU and a period of 0.77 yr.

Aten Observations: 177
Orbital Period · P
0.77 yr
v(q)
42 km/s
v(Q)
25.1 km/s
Diameter · ≈
0.03 km
TJ
6.95
Eccentricity · e
0.2512

Orbit and dynamics

The path is an ellipse reaching 0.63 AU from the Sun at perihelion and 1.052 AU at aphelion, a radial span of 0.422 AU.

Applying Kepler's third law to a = 0.841 AU gives an orbital period of 0.77 yr, or about 282 days.

An eccentricity of 0.251 makes the orbit moderately elongated.

The orbital plane is tilted 13.2° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 42 km/s at perihelion and falls to 25.1 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 = 25.3 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.03 km.

Observation record and orbit quality

The current orbit solution is based on 177 observations and has a weighted RMS residual of 0.285 arcseconds.

Condition code U = 6 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
0.8409 AU
Eccentricity
0.2512
Perihelion
0.63 AU
Aphelion
1.052134 AU
Inclination
13.2°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
114.81°

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
25.3

Orbit Quality

RMS
0.28498
Condition
6
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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