SpaceAtlas Space Object Data
NASA JPL SBDB · 2003 EP4

2003 EP4

2003 EP4 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.36 AU it takes 1.59 yr to circle the Sun.

Apollo Observations: 99
Orbital Period · P
1.59 yr
v(q)
55 km/s
v(Q)
11.9 km/s
Diameter · ≈
0.06 km
TJ
4.61
Eccentricity · e
0.6447

Orbit and dynamics

The path is an ellipse reaching 0.483 AU from the Sun at perihelion and 2.237 AU at aphelion, a radial span of 1.754 AU.

Applying Kepler's third law to a = 1.36 AU gives an orbital period of 1.59 yr, or about 579 days.

The high eccentricity (0.645) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

Its inclination of 0.51° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 55 km/s at perihelion and falls to 11.9 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 = 23.93 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.06 km.

Observation record and orbit quality

The current orbit solution is based on 99 observations and has a weighted RMS residual of 0.6449 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
1.36 AU
Eccentricity
0.6447
Perihelion
0.483 AU
Aphelion
2.236792 AU
Inclination
0.51°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
206.34°

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
2028-Oct-30 08:56 0.225224 AU
33693091 km
28.05 km/s
2030-Feb-26 19:14 0.287877 AU
43065815 km
30.03 km/s
2036-Oct-10 17:13 0.207724 AU
31075059 km
15.02 km/s
2041-Apr-11 11:31 0.350479 AU
52430839 km
11.93 km/s
2044-Aug-07 05:17 0.486529 AU
72783726 km
21.37 km/s
2047-Nov-09 10:52 0.425681 AU
63680979 km
34.37 km/s
2049-Mar-08 03:19 0.077293 AU
11562929 km
23.52 km/s
2055-Oct-20 05:03 0.025708 AU
3845935 km
20.43 km/s
2060-Mar-15 19:28 0.474328 AU
70958461 km
10.29 km/s
2060-May-04 23:10 0.427123 AU
63896693 km
16.84 km/s
2063-Aug-17 05:04 0.461480 AU
69036491 km
19.32 km/s
2066-Nov-11 04:24 0.463405 AU
69324369 km
35.61 km/s
2068-Mar-08 22:16 0.055685 AU
8330420 km
22.85 km/s
2074-Oct-18 02:37 0.070862 AU
10600737 km
19.07 km/s
2079-Apr-24 02:01 0.386340 AU
57795637 km
14.07 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
23.93

Orbit Quality

RMS
0.64485
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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