SpaceAtlas Space Object Data
NASA JPL SBDB · 87309

87309

87309 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.848 AU and a period of 0.78 yr.

Aten Observations: 1,157
Orbital Period · P
0.78 yr
v(q)
53.4 km/s
v(Q)
19.6 km/s
Diameter · ≈
1.08 km
TJ
6.73
Eccentricity · e
0.4632

Orbit and dynamics

The path is an ellipse reaching 0.455 AU from the Sun at perihelion and 1.24 AU at aphelion, a radial span of 0.785 AU.

Applying Kepler's third law to a = 0.848 AU gives an orbital period of 0.78 yr, or about 285 days.

The high eccentricity (0.463) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 34.74° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 53.4 km/s at perihelion and falls to 19.6 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

The measured diameter is 0.57 km, a value from direct size determination rather than from brightness alone.

A geometric albedo of 0.499 points to a comparatively bright, reflective surface.

Observation record and orbit quality

The current orbit solution is based on 1,157 observations and has a weighted RMS residual of 0.4804 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
0.8475 AU
Eccentricity
0.4632
Perihelion
0.455 AU
Aphelion
1.240062 AU
Inclination
34.74°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
267.24°

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
0.568 km
Albedo
0.499
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
17.59

Orbit Quality

RMS
0.48043
Condition
0
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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