SpaceAtlas Space Object Data
NASA JPL SBDB · 448721

448721

448721 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.544 AU it takes 1.92 yr to circle the Sun.

Apollo Observations: 80
Orbital Period · P
1.92 yr
v(q)
37.1 km/s
v(Q)
15.5 km/s
Diameter · ≈
0.23 km
TJ
4.36
Eccentricity · e
0.4121

Orbit and dynamics

The path is an ellipse reaching 0.908 AU from the Sun at perihelion and 2.18 AU at aphelion, a radial span of 1.272 AU.

Applying Kepler's third law to a = 1.544 AU gives an orbital period of 1.92 yr, or about 701 days.

The high eccentricity (0.412) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

Its inclination of 3.93° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 37.1 km/s at perihelion and falls to 15.5 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 = 20.97 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.23 km.

Observation record and orbit quality

The current orbit solution is based on 80 observations and has a weighted RMS residual of 0.519 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
1.544 AU
Eccentricity
0.4121
Perihelion
0.908 AU
Aphelion
2.180282 AU
Inclination
3.93°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
276.37°

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
2036-Aug-05 08:29 0.072165 AU
10795713 km
10.52 km/s
2038-Apr-15 06:28 0.039841 AU
5960121 km
10.72 km/s
2059-Aug-06 19:54 0.073653 AU
11018359 km
10.60 km/s
2061-Apr-14 09:02 0.048268 AU
7220831 km
11.02 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
20.97

Orbit Quality

RMS
0.51898
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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