SpaceAtlas Space Object Data
NASA JPL SBDB · 2025 MP99

2025 MP99

2025 MP99 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.328 AU once every 1.53 yr.

Amor Observations: 19
Orbital Period · P
1.53 yr
v(q)
29.5 km/s
v(Q)
22.7 km/s
Diameter · ≈
0.08 km
TJ
4.9
Eccentricity · e
0.1301

Orbit and dynamics

The path is an ellipse reaching 1.155 AU from the Sun at perihelion and 1.501 AU at aphelion, a radial span of 0.346 AU.

Applying Kepler's third law to a = 1.328 AU gives an orbital period of 1.53 yr, or about 559 days.

An eccentricity of 0.13 makes the orbit moderately elongated.

The orbital plane is tilted 12.92° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 29.5 km/s at perihelion and falls to 22.7 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 = 23.13 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.08 km.

Observation record and orbit quality

The current orbit solution is based on 19 observations and has a weighted RMS residual of 0.4458 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
1.328 AU
Eccentricity
0.1301
Perihelion
1.155 AU
Aphelion
1.500773 AU
Inclination
12.92°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
160.53°

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
23.13

Orbit Quality

RMS
0.44576
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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