SpaceAtlas Space Object Data
NASA JPL SBDB · 250577

250577

250577 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.05 AU it takes 1.08 yr to circle the Sun.

Apollo Observations: 305
Orbital Period · P
1.08 yr
v(q)
51.6 km/s
v(Q)
16.4 km/s
Diameter · ≈
0.75 km
TJ
5.48
Eccentricity · e
0.5177

Orbit and dynamics

The path is an ellipse reaching 0.506 AU from the Sun at perihelion and 1.594 AU at aphelion, a radial span of 1.088 AU.

Applying Kepler's third law to a = 1.05 AU gives an orbital period of 1.08 yr, or about 393 days.

The high eccentricity (0.518) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 46.88° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 51.6 km/s at perihelion and falls to 16.4 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 = 18.37 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.75 km.

Observation record and orbit quality

The current orbit solution is based on 305 observations and has a weighted RMS residual of 0.4505 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
1.05 AU
Eccentricity
0.5177
Perihelion
0.506 AU
Aphelion
1.593585 AU
Inclination
46.88°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
272.97°

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
18.37

Orbit Quality

RMS
0.45049
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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