SpaceAtlas Space Object Data
NASA JPL SBDB · 525477

525477

525477 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.973 AU it takes 2.77 yr to circle the Sun.

Apollo Observations: 444
Orbital Period · P
2.77 yr
v(q)
41.7 km/s
v(Q)
10.8 km/s
Diameter · ≈
0.47 km
TJ
3.62
Eccentricity · e
0.5894

Orbit and dynamics

Between its closest point (0.81 AU) and its farthest (3.136 AU), the heliocentric distance changes by 2.326 AU over every revolution.

One full revolution takes 2.77 yr (1,012 days), computed from the semi-major axis of 1.973 AU.

The high eccentricity (0.589) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 9.86° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 41.7 km/s at perihelion and falls to 10.8 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 = 19.38 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.47 km.

Observation record and orbit quality

Astrometry from 444 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4566 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
1.973 AU
Eccentricity
0.5894
Perihelion
0.81 AU
Aphelion
3.135886 AU
Inclination
9.86°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
200.57°

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
2030-Jul-11 22:49 0.193290 AU
28915800 km
11.23 km/s
2066-Aug-16 03:38 0.185289 AU
27718836 km
20.27 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
19.38

Orbit Quality

RMS
0.45657
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.