SpaceAtlas Space Object Data
NASA JPL SBDB · 2021 GS12

2021 GS12

2021 GS12 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.942 AU and a period of 0.91 yr.

Aten Observations: 20
Orbital Period · P
0.91 yr
v(q)
39 km/s
v(Q)
24.2 km/s
Diameter · ≈
0.03 km
TJ
6.35
Eccentricity · e
0.2351

Orbit and dynamics

Between its closest point (0.72 AU) and its farthest (1.163 AU), the heliocentric distance changes by 0.443 AU over every revolution.

One full revolution takes 0.91 yr (334 days), computed from the semi-major axis of 0.942 AU.

An eccentricity of 0.235 makes the orbit moderately elongated.

Its inclination of 2.48° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 39 km/s at perihelion and falls to 24.2 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 = 25.6 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.03 km.

Observation record and orbit quality

Astrometry from 20 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4546 arcseconds.

Condition code U = 4 indicates a moderately constrained orbit; predictions decades ahead still carry noticeable uncertainty.

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
0.9418 AU
Eccentricity
0.2351
Perihelion
0.72 AU
Aphelion
1.163217 AU
Inclination
2.48°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
334.88°

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
2031-Apr-12 16:32 0.350156 AU
52382526 km
16.95 km/s
2032-Feb-14 02:46 0.183383 AU
27433751 km
4.35 km/s
2032-May-07 10:05 0.131081 AU
19609496 km
5.07 km/s
2032-Nov-04 12:06 0.252281 AU
37740768 km
8.15 km/s
2033-Jul-31 09:22 0.143431 AU
21457017 km
10.44 km/s
2042-Apr-03 04:58 0.117352 AU
17555587 km
9.84 km/s
2042-Dec-24 06:07 0.256852 AU
38424490 km
8.44 km/s
2043-Jul-03 00:45 0.127021 AU
19002107 km
4.86 km/s
2043-Sep-07 00:14 0.166440 AU
24899084 km
3.26 km/s
2044-Jul-21 23:50 0.365872 AU
54733681 km
17.29 km/s
2053-Apr-01 20:09 0.124254 AU
18588208 km
12.27 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
25.6

Orbit Quality

RMS
0.45456
Condition
4
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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