SpaceAtlas Space Object Data
NASA JPL SBDB · 447221

447221

447221 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.161 AU it takes 1.25 yr to circle the Sun.

Apollo Observations: 171
Orbital Period · P
1.25 yr
v(q)
32.1 km/s
v(Q)
23.8 km/s
Diameter · ≈
0.24 km
TJ
5.36
Eccentricity · e
0.1504

Orbit and dynamics

Between its closest point (0.987 AU) and its farthest (1.336 AU), the heliocentric distance changes by 0.349 AU over every revolution.

One full revolution takes 1.25 yr (457 days), computed from the semi-major axis of 1.161 AU.

An eccentricity of 0.15 makes the orbit moderately elongated.

The orbital plane is tilted 19.68° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 32.1 km/s at perihelion and falls to 23.8 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 = 20.82 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.24 km.

Observation record and orbit quality

Astrometry from 171 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5529 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
1.161 AU
Eccentricity
0.1504
Perihelion
0.987 AU
Aphelion
1.335614 AU
Inclination
19.68°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
92.45°

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

No close approaches to Earth are currently on record for this object.

Physical Parameters

Diameter
— km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
20.82

Orbit Quality

RMS
0.5529
Condition
0
Orbit ID
—
Data source: NASA JPL Small-Body Database . 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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