SpaceAtlas Space Object Data
NASA JPL SBDB · 477588

477588

477588 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.428 AU it takes 1.71 yr to circle the Sun.

Apollo Observations: 94
Orbital Period · P
1.71 yr
v(q)
53.1 km/s
v(Q)
11.7 km/s
Diameter · ≈
0.47 km
TJ
4.38
Eccentricity · e
0.6395

Orbit and dynamics

The path is an ellipse reaching 0.515 AU from the Sun at perihelion and 2.341 AU at aphelion, a radial span of 1.826 AU.

Applying Kepler's third law to a = 1.428 AU gives an orbital period of 1.71 yr, or about 623 days.

The high eccentricity (0.639) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 24.62° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 53.1 km/s at perihelion and falls to 11.7 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 0.69 km, a value from direct size determination rather than from brightness alone.

Its geometric albedo of 0.093 indicates a very dark, carbonaceous-type surface.

Observation record and orbit quality

The current orbit solution is based on 94 observations and has a weighted RMS residual of 0.5295 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
1.428 AU
Eccentricity
0.6395
Perihelion
0.515 AU
Aphelion
2.341206 AU
Inclination
24.62°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
192.73°

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
0.692 km
Albedo
0.093
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
19.39

Orbit Quality

RMS
0.52951
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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