SpaceAtlas Space Object Data
NASA JPL SBDB · 381677

381677

381677 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.851 AU it takes 2.52 yr to circle the Sun.

Apollo Observations: 1,956
Orbital Period · P
2.52 yr
v(q)
35.8 km/s
v(Q)
13.4 km/s
Diameter · ≈
0.76 km
TJ
3.87
Eccentricity · e
0.4558

Orbit and dynamics

The path is an ellipse reaching 1.007 AU from the Sun at perihelion and 2.695 AU at aphelion, a radial span of 1.688 AU.

Applying Kepler's third law to a = 1.851 AU gives an orbital period of 2.52 yr, or about 920 days.

The high eccentricity (0.456) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 5.84° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 35.8 km/s at perihelion and falls to 13.4 km/s at aphelion.

Size and surface

The measured diameter is 0.47 km, a value from direct size determination rather than from brightness alone.

A geometric albedo of 0.346 points to a comparatively bright, reflective surface.

Observation record and orbit quality

The current orbit solution is based on 1,956 observations and has a weighted RMS residual of 0.3063 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
1.851 AU
Eccentricity
0.4558
Perihelion
1.007 AU
Aphelion
2.694686 AU
Inclination
5.84°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
306.25°

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
0.472 km
Albedo
0.346
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
18.36

Orbit Quality

RMS
0.3063
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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