SpaceAtlas Space Object Data
NASA JPL SBDB · 2008 EJ

2008 EJ

2008 EJ belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.111 AU it takes 1.17 yr to circle the Sun.

Apollo Observations: 139
Orbital Period · P
1.17 yr
v(q)
47.8 km/s
v(Q)
16.7 km/s
Diameter · ≈
0.35 km
TJ
5.3
Eccentricity · e
0.4827

Orbit and dynamics

The path is an ellipse reaching 0.575 AU from the Sun at perihelion and 1.647 AU at aphelion, a radial span of 1.072 AU.

Applying Kepler's third law to a = 1.111 AU gives an orbital period of 1.17 yr, or about 428 days.

The high eccentricity (0.483) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 40.4° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 47.8 km/s at perihelion and falls to 16.7 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 = 20.05 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.35 km.

Observation record and orbit quality

The current orbit solution is based on 139 observations and has a weighted RMS residual of 0.5783 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
0.4827
Perihelion
0.575 AU
Aphelion
1.64728 AU
Inclination
40.4°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
322.68°

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-Sep-10 22:28 0.406893 AU
60870383 km
30.35 km/s
2029-Feb-18 19:34 0.362145 AU
54176182 km
22.77 km/s
2034-Sep-21 22:19 0.432320 AU
64674157 km
30.43 km/s
2036-Feb-20 03:14 0.392677 AU
58743685 km
24.72 km/s
2041-Oct-03 03:20 0.471444 AU
70526971 km
30.37 km/s
2043-Feb-21 19:00 0.451683 AU
67570748 km
27.28 km/s
2054-Aug-03 02:36 0.473705 AU
70865222 km
30.52 km/s
2056-Feb-26 12:11 0.455345 AU
68118645 km
20.15 km/s
2061-Aug-13 21:03 0.430657 AU
64425344 km
30.30 km/s
2063-Feb-23 11:28 0.409027 AU
61189631 km
20.41 km/s
2068-Aug-24 17:30 0.405616 AU
60679330 km
30.24 km/s
2070-Feb-20 22:12 0.372917 AU
55787535 km
20.96 km/s
2075-Sep-05 12:36 0.401667 AU
60088547 km
30.30 km/s
2077-Feb-19 07:37 0.357060 AU
53415388 km
21.98 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
20.05

Orbit Quality

RMS
0.57825
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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