SpaceAtlas Space Object Data
NASA JPL SBDB · 401954

401954

401954 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.825 AU and a period of 0.75 yr.

Aten Observations: 167
Orbital Period · P
0.75 yr
v(q)
44.1 km/s
v(Q)
24.4 km/s
Diameter · ≈
0.59 km
TJ
7.07
Eccentricity · e
0.2866

Orbit and dynamics

The path is an ellipse reaching 0.588 AU from the Sun at perihelion and 1.061 AU at aphelion, a radial span of 0.473 AU.

Applying Kepler's third law to a = 0.825 AU gives an orbital period of 0.75 yr, or about 273 days.

An eccentricity of 0.287 makes the orbit moderately elongated.

Its inclination of 1.35° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 44.1 km/s at perihelion and falls to 24.4 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 = 18.89 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.59 km.

Observation record and orbit quality

The current orbit solution is based on 167 observations and has a weighted RMS residual of 0.5258 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
0.8245 AU
Eccentricity
0.2866
Perihelion
0.588 AU
Aphelion
1.060802 AU
Inclination
1.35°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
100.48°

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
18.89

Orbit Quality

RMS
0.52576
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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