SpaceAtlas Space Object Data
NASA JPL SBDB · 397471

397471

397471 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.763 AU once every 2.34 yr.

Amor Observations: 249
Orbital Period · P
2.34 yr
v(q)
29.6 km/s
v(Q)
17 km/s
Diameter · ≈
0.82 km
TJ
4.02
Eccentricity · e
0.271

Orbit and dynamics

Between its closest point (1.285 AU) and its farthest (2.241 AU), the heliocentric distance changes by 0.956 AU over every revolution.

One full revolution takes 2.34 yr (855 days), computed from the semi-major axis of 1.763 AU.

An eccentricity of 0.271 makes the orbit moderately elongated.

The orbital plane is tilted 17° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 29.6 km/s at perihelion and falls to 17 km/s at aphelion.

Its perihelion lies just outside Earth's orbit, which is why it is classed as Earth-approaching rather than Earth-crossing.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 18.19 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.82 km.

Observation record and orbit quality

Astrometry from 249 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4897 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
1.763 AU
Eccentricity
0.271
Perihelion
1.285 AU
Aphelion
2.240773 AU
Inclination
17.0°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
7.39°

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
18.19

Orbit Quality

RMS
0.4897
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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