SpaceAtlas Space Object Data
NASA JPL SBDB · 2016 WD7

2016 WD7

2016 WD7 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.247 AU it takes 1.39 yr to circle the Sun.

Apollo Observations: 71
Orbital Period · P
1.39 yr
v(q)
32.9 km/s
v(Q)
21.6 km/s
Diameter · ≈
0.01 km
TJ
5.13
Eccentricity · e
0.2061

Orbit and dynamics

The path is an ellipse reaching 0.99 AU from the Sun at perihelion and 1.504 AU at aphelion, a radial span of 0.514 AU.

Applying Kepler's third law to a = 1.247 AU gives an orbital period of 1.39 yr, or about 509 days.

An eccentricity of 0.206 makes the orbit moderately elongated.

Its inclination of 0.67° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 32.9 km/s at perihelion and falls to 21.6 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 = 27.3 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

The current orbit solution is based on 71 observations and has a weighted RMS residual of 0.3663 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
1.247 AU
Eccentricity
0.2061
Perihelion
0.99 AU
Aphelion
1.504007 AU
Inclination
0.67°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
286.7°

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-Jul-09 05:34 0.471366 AU
70515355 km
7.39 km/s
2030-Oct-22 07:23 0.373867 AU
55929658 km
14.35 km/s
2031-Apr-08 16:06 0.337614 AU
50506382 km
5.11 km/s
2034-Jul-25 23:37 0.435997 AU
65224272 km
6.80 km/s
2038-Apr-30 05:24 0.408651 AU
61133246 km
6.44 km/s
2041-Aug-14 04:59 0.378817 AU
56670189 km
5.79 km/s
2042-Feb-15 16:41 0.487801 AU
72973920 km
17.79 km/s
2045-May-17 13:37 0.454146 AU
67939274 km
7.19 km/s
2048-Sep-07 18:42 0.294074 AU
43992817 km
4.11 km/s
2049-Feb-04 04:52 0.278200 AU
41618113 km
11.55 km/s
2052-Jun-01 15:43 0.479966 AU
71801934 km
7.58 km/s
2056-Jan-21 10:36 0.083265 AU
12456199 km
5.50 km/s
2059-Jun-13 17:37 0.491140 AU
73473535 km
7.72 km/s
2062-Dec-17 11:21 0.009894 AU
1480079 km
2.73 km/s
2066-Jun-21 02:14 0.492831 AU
73726411 km
7.74 km/s
2069-Nov-21 00:20 0.018716 AU
2799902 km
3.94 km/s
2073-Jul-03 07:03 0.474067 AU
70919375 km
7.54 km/s
2076-Oct-27 16:41 0.234638 AU
35101400 km
12.22 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
27.3

Orbit Quality

RMS
0.36634
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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