SpaceAtlas Space Object Data
NASA JPL SBDB · 490581

490581

490581 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.856 AU and a period of 0.79 yr.

Aten Observations: 1,209
Orbital Period · P
0.79 yr
v(q)
39.1 km/s
v(Q)
26.5 km/s
Diameter · ≈
0.24 km
TJ
6.87
Eccentricity · e
0.1926

Orbit and dynamics

The path is an ellipse reaching 0.691 AU from the Sun at perihelion and 1.02 AU at aphelion, a radial span of 0.329 AU.

Applying Kepler's third law to a = 0.856 AU gives an orbital period of 0.79 yr, or about 289 days.

An eccentricity of 0.193 makes the orbit moderately elongated.

The orbital plane is tilted 9.84° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 39.1 km/s at perihelion and falls to 26.5 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 0.24 km, a value from direct size determination rather than from brightness alone.

A geometric albedo of 0.314 points to a comparatively bright, reflective surface.

Observation record and orbit quality

The current orbit solution is based on 1,209 observations and has a weighted RMS residual of 0.1978 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
0.8555 AU
Eccentricity
0.1926
Perihelion
0.691 AU
Aphelion
1.020269 AU
Inclination
9.84°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
98.9°

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
0.237 km
Albedo
0.314
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
20.85

Orbit Quality

RMS
0.19775
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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