SpaceAtlas Space Object Data
NASA JPL SBDB · 503941

503941

503941 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.453 AU it takes 1.75 yr to circle the Sun.

Apollo Observations: 1,089
Orbital Period · P
1.75 yr
v(q)
67.3 km/s
v(Q)
9.1 km/s
Diameter · ≈
0.42 km
TJ
4.26
Eccentricity · e
0.7628

Orbit and dynamics

The path is an ellipse reaching 0.345 AU from the Sun at perihelion and 2.561 AU at aphelion, a radial span of 2.216 AU.

Applying Kepler's third law to a = 1.453 AU gives an orbital period of 1.75 yr, or about 640 days.

The high eccentricity (0.763) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 5.93° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 67.3 km/s at perihelion and falls to 9.1 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 0.26 km, a value from direct size determination rather than from brightness alone.

A geometric albedo of 0.376 points to a comparatively bright, reflective surface.

Observation record and orbit quality

The current orbit solution is based on 1,089 observations and has a weighted RMS residual of 0.3221 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
1.453 AU
Eccentricity
0.7628
Perihelion
0.345 AU
Aphelion
2.561348 AU
Inclination
5.93°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
301.53°

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

Predicted close approaches to Earth, from NASA's Center for Near-Earth Object Studies (CNEOS).

Date (UTC)Miss distanceVelocity
2031-Nov-05 13:10 0.157507 AU
23562780 km
21.05 km/s

Distances in astronomical units (AU) and kilometres. Source: NASA/JPL CNEOS Close Approach Data API.

Physical Parameters

Diameter
0.26 km
Albedo
0.376
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
19.62

Orbit Quality

RMS
0.32212
Condition
0
Orbit ID
—
Data source: NASA JPL Small-Body Database · NASA CNEOS. 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.

Keep exploring

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