SpaceAtlas Space Object Data
NASA JPL SBDB · 89959

89959

89959 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.735 AU it takes 2.29 yr to circle the Sun.

Apollo Observations: 1,971
Orbital Period · P
2.29 yr
v(q)
40.7 km/s
v(Q)
12.6 km/s
Diameter · ≈
1.74 km
TJ
3.72
Eccentricity · e
0.5284

Orbit and dynamics

The path is an ellipse reaching 0.818 AU from the Sun at perihelion and 2.652 AU at aphelion, a radial span of 1.834 AU.

Applying Kepler's third law to a = 1.735 AU gives an orbital period of 2.29 yr, or about 835 days.

The high eccentricity (0.528) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 42.36° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 40.7 km/s at perihelion and falls to 12.6 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 1.41 km, a value from direct size determination rather than from brightness alone.

A geometric albedo of 0.224 points to a comparatively bright, reflective surface.

Observation record and orbit quality

The current orbit solution is based on 1,971 observations and has a weighted RMS residual of 0.4343 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
1.735 AU
Eccentricity
0.5284
Perihelion
0.818 AU
Aphelion
2.651774 AU
Inclination
42.36°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
105.3°

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
1.407 km
Albedo
0.224
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
16.55

Orbit Quality

RMS
0.4343
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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