SpaceAtlas Space Object Data
NASA JPL SBDB · 2021 LD6

2021 LD6

2021 LD6 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.988 AU and a period of 0.98 yr.

Aten Observations: 41
Orbital Period · P
0.98 yr
v(q)
33.1 km/s
v(Q)
27.1 km/s
Diameter · ≈
0.01 km
TJ
6.13
Eccentricity · e
0.1

Orbit and dynamics

Between its closest point (0.889 AU) and its farthest (1.087 AU), the heliocentric distance changes by 0.198 AU over every revolution.

One full revolution takes 0.98 yr (359 days), computed from the semi-major axis of 0.988 AU.

An eccentricity of 0.1 makes the orbit moderately elongated.

Its inclination of 0.77° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 33.1 km/s at perihelion and falls to 27.1 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 = 27.2 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

Astrometry from 41 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4533 arcseconds.

Condition code U = 3 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
0.9882 AU
Eccentricity
0.1
Perihelion
0.889 AU
Aphelion
1.08702 AU
Inclination
0.77°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
267.07°

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
2070-Feb-10 14:52 0.445305 AU
66616654 km
16.43 km/s
2071-Feb-05 22:28 0.335307 AU
50161212 km
13.09 km/s
2072-Feb-01 08:21 0.225545 AU
33740991 km
9.75 km/s
2073-Jan-26 20:05 0.117428 AU
17566945 km
6.45 km/s
2074-Jan-23 02:15 0.016029 AU
2397973 km
3.40 km/s
2075-Jan-22 01:37 0.013390 AU
2003074 km
2.50 km/s
2075-Nov-29 00:47 0.082805 AU
12387423 km
2.49 km/s
2076-Mar-09 23:59 0.075455 AU
11287965 km
2.38 km/s
2076-Oct-19 18:00 0.103666 AU
15508240 km
3.17 km/s
2077-Apr-18 20:45 0.084698 AU
12670646 km
2.60 km/s
2077-Sep-13 13:07 0.098008 AU
14661721 km
2.92 km/s
2078-Jun-05 05:04 0.047546 AU
7112736 km
1.90 km/s
2079-Jun-27 16:15 0.001721 AU
257520 km
3.39 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
27.2

Orbit Quality

RMS
0.45332
Condition
3
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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