SpaceAtlas Space Object Data
NASA JPL SBDB · 21374

21374

21374 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.269 AU once every 1.43 yr.

Amor Observations: 2,351
Orbital Period · P
1.43 yr
v(q)
29.8 km/s
v(Q)
23.4 km/s
Diameter · ≈
1.15 km
TJ
5
Eccentricity · e
0.1207

Orbit and dynamics

Between its closest point (1.116 AU) and its farthest (1.422 AU), the heliocentric distance changes by 0.306 AU over every revolution.

One full revolution takes 1.43 yr (522 days), computed from the semi-major axis of 1.269 AU.

An eccentricity of 0.121 makes the orbit moderately elongated.

A steep inclination of 23.98° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 29.8 km/s at perihelion and falls to 23.4 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 = 17.45 and an assumed geometric albedo of 0.14, the diameter works out to roughly 1.15 km.

Observation record and orbit quality

Astrometry from 2,351 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4768 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
1.269 AU
Eccentricity
0.1207
Perihelion
1.116 AU
Aphelion
1.422168 AU
Inclination
23.98°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
142.67°

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

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
17.45

Orbit Quality

RMS
0.47679
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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