SpaceAtlas Space Object Data
NASA JPL SBDB · 2021 PR16

2021 PR16

2021 PR16 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.111 AU once every 1.17 yr.

Amor Observations: 41
Orbital Period · P
1.17 yr
v(q)
30.7 km/s
v(Q)
26 km/s
Diameter · ≈
0.02 km
TJ
5.61
Eccentricity · e
0.0826

Orbit and dynamics

Between its closest point (1.02 AU) and its farthest (1.203 AU), the heliocentric distance changes by 0.183 AU over every revolution.

One full revolution takes 1.17 yr (428 days), computed from the semi-major axis of 1.111 AU.

With e = 0.083, the orbit is close to circular.

Its inclination of 1.33° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 30.7 km/s at perihelion and falls to 26 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 = 26.53 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

Astrometry from 41 individual observations underpins this orbit; the fit leaves an RMS residual of 0.524 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
1.111 AU
Eccentricity
0.0826
Perihelion
1.02 AU
Aphelion
1.202769 AU
Inclination
1.33°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
321.4°

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
2028-Jul-03 20:59 0.157495 AU
23560890 km
2.51 km/s
2035-May-18 06:21 0.193281 AU
28914362 km
3.47 km/s
2041-Oct-07 11:42 0.410422 AU
61398326 km
12.30 km/s
2042-Apr-05 15:50 0.186677 AU
27926429 km
3.44 km/s
2049-Feb-15 07:31 0.138452 AU
20712124 km
2.28 km/s
2055-Oct-30 14:18 0.035658 AU
5334331 km
1.16 km/s
2062-Nov-13 01:18 0.075905 AU
11355291 km
1.82 km/s
2062-Dec-21 16:18 0.075154 AU
11242883 km
0.16 km/s
2070-Mar-09 04:41 0.148951 AU
22282738 km
2.68 km/s
2077-Apr-24 07:29 0.179669 AU
26878084 km
3.34 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
26.53

Orbit Quality

RMS
0.52398
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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