SpaceAtlas Space Object Data
NASA JPL SBDB · 2021 GD3

2021 GD3

2021 GD3 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.314 AU once every 1.51 yr.

Amor Observations: 57
Orbital Period · P
1.51 yr
v(q)
32.3 km/s
v(Q)
20.9 km/s
Diameter · ≈
0.01 km
TJ
4.94
Eccentricity · e
0.2152

Orbit and dynamics

Between its closest point (1.031 AU) and its farthest (1.597 AU), the heliocentric distance changes by 0.566 AU over every revolution.

One full revolution takes 1.51 yr (550 days), computed from the semi-major axis of 1.314 AU.

An eccentricity of 0.215 makes the orbit moderately elongated.

Its inclination of 3.94° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 32.3 km/s at perihelion and falls to 20.9 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 = 26.94 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

Astrometry from 57 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4854 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
1.314 AU
Eccentricity
0.2152
Perihelion
1.031 AU
Aphelion
1.596773 AU
Inclination
3.94°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
148.08°

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
2027-May-20 12:11 0.093523 AU
13990913 km
5.29 km/s
2030-Feb-21 01:35 0.264628 AU
39587821 km
1.67 km/s
2030-Jun-02 02:26 0.204522 AU
30596054 km
8.68 km/s
2033-Jan-25 04:38 0.342681 AU
51264405 km
4.28 km/s
2033-Jun-11 01:20 0.330089 AU
49380545 km
12.41 km/s
2036-Jan-10 02:31 0.405972 AU
60732617 km
5.77 km/s
2036-Jun-18 20:13 0.463335 AU
69313922 km
16.29 km/s
2038-Dec-28 07:50 0.457431 AU
68430700 km
6.85 km/s
2077-Sep-03 13:23 0.488489 AU
73076963 km
7.08 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
26.94

Orbit Quality

RMS
0.48545
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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