SpaceAtlas Space Object Data
NASA JPL SBDB · 478574

478574

478574 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.608 AU it takes 2.04 yr to circle the Sun.

Apollo Observations: 220
Orbital Period · P
2.04 yr
v(q)
35.1 km/s
v(Q)
15.7 km/s
Diameter · ≈
0.68 km
TJ
4.1
Eccentricity · e
0.3816

Orbit and dynamics

The path is an ellipse reaching 0.995 AU from the Sun at perihelion and 2.222 AU at aphelion, a radial span of 1.227 AU.

Applying Kepler's third law to a = 1.608 AU gives an orbital period of 2.04 yr, or about 745 days.

An eccentricity of 0.382 makes the orbit moderately elongated.

A steep inclination of 32.67° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 35.1 km/s at perihelion and falls to 15.7 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 = 18.6 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.68 km.

Observation record and orbit quality

The current orbit solution is based on 220 observations and has a weighted RMS residual of 0.6041 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
1.608 AU
Eccentricity
0.3816
Perihelion
0.995 AU
Aphelion
2.221613 AU
Inclination
32.67°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
53.67°

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
2032-Mar-19 08:30 0.183739 AU
27486894 km
20.66 km/s
2034-Apr-01 15:35 0.059380 AU
8883057 km
18.81 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
18.6

Orbit Quality

RMS
0.60413
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.

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