SpaceAtlas Space Object Data
NASA JPL SBDB · 506491

506491

506491 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.17 AU it takes 1.27 yr to circle the Sun.

Apollo Observations: 135
Orbital Period · P
1.27 yr
v(q)
92.9 km/s
v(Q)
8.2 km/s
Diameter · ≈
0.26 km
TJ
4.96
Eccentricity · e
0.8384

Orbit and dynamics

The path is an ellipse reaching 0.189 AU from the Sun at perihelion and 2.151 AU at aphelion, a radial span of 1.962 AU.

Applying Kepler's third law to a = 1.17 AU gives an orbital period of 1.27 yr, or about 462 days.

The high eccentricity (0.838) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

Its inclination of 3.76° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 92.9 km/s at perihelion and falls to 8.2 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 = 20.69 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.26 km.

Observation record and orbit quality

The current orbit solution is based on 135 observations and has a weighted RMS residual of 0.6321 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
1.17 AU
Eccentricity
0.8384
Perihelion
0.189 AU
Aphelion
2.150928 AU
Inclination
3.76°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
3.44°

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
2027-Oct-23 15:52 0.087385 AU
13072616 km
27.37 km/s
2044-Jan-10 12:53 0.083657 AU
12514951 km
31.44 km/s
2051-Oct-30 15:36 0.101650 AU
15206690 km
32.98 km/s
2068-Jan-17 07:20 0.154513 AU
23114860 km
25.69 km/s
2070-Oct-25 03:20 0.047112 AU
7047834 km
28.60 km/s

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

Physical Parameters

Diameter
— km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
20.69

Orbit Quality

RMS
0.6321
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

Explore asteroids, comets and near-Earth objects with JPL orbital data.