SpaceAtlas Space Object Data
NASA JPL SBDB · 99799

99799

99799 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.462 AU once every 1.77 yr.

Amor Observations: 2,410
Orbital Period · P
1.77 yr
v(q)
32.7 km/s
v(Q)
18.6 km/s
Diameter · ≈
0.7 km
TJ
4.57
Eccentricity · e
0.2757

Orbit and dynamics

The path is an ellipse reaching 1.059 AU from the Sun at perihelion and 1.865 AU at aphelion, a radial span of 0.806 AU.

Applying Kepler's third law to a = 1.462 AU gives an orbital period of 1.77 yr, or about 646 days.

An eccentricity of 0.276 makes the orbit moderately elongated.

The orbital plane is tilted 7.56° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 32.7 km/s at perihelion and falls to 18.6 km/s at aphelion.

Its perihelion lies just outside Earth's orbit, which is why it is classed as Earth-approaching rather than Earth-crossing.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 18.52 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.7 km.

Observation record and orbit quality

The current orbit solution is based on 2,410 observations and has a weighted RMS residual of 0.3759 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
1.462 AU
Eccentricity
0.2757
Perihelion
1.059 AU
Aphelion
1.865073 AU
Inclination
7.56°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
121.84°

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
18.52

Orbit Quality

RMS
0.37593
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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