SpaceAtlas Space Object Data
NASA JPL SBDB · 420738

420738

420738 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.99 AU and a period of 0.98 yr.

Aten Observations: 535
Orbital Period · P
0.98 yr
v(q)
33.6 km/s
v(Q)
26.7 km/s
Diameter · ≈
0.24 km
TJ
6.09
Eccentricity · e
0.1134

Orbit and dynamics

The path is an ellipse reaching 0.877 AU from the Sun at perihelion and 1.102 AU at aphelion, a radial span of 0.225 AU.

Applying Kepler's third law to a = 0.99 AU gives an orbital period of 0.98 yr, or about 360 days.

An eccentricity of 0.113 makes the orbit moderately elongated.

The orbital plane is tilted 16.46° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 33.6 km/s at perihelion and falls to 26.7 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

No direct size measurement is available; from an absolute magnitude of H = 20.84 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.24 km.

Observation record and orbit quality

The current orbit solution is based on 535 observations and has a weighted RMS residual of 0.417 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
0.9897 AU
Eccentricity
0.1134
Perihelion
0.877 AU
Aphelion
1.101932 AU
Inclination
16.46°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
104.87°

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
20.84

Orbit Quality

RMS
0.41699
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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