SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 EO4

2018 EO4

2018 EO4 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.828 AU and a period of 0.75 yr.

Aten Observations: 87
Orbital Period · P
0.75 yr
v(q)
45.2 km/s
v(Q)
23.7 km/s
Diameter · ≈
0.07 km
TJ
6.98
Eccentricity · e
0.3121

Orbit and dynamics

The path is an ellipse reaching 0.57 AU from the Sun at perihelion and 1.087 AU at aphelion, a radial span of 0.517 AU.

Applying Kepler's third law to a = 0.828 AU gives an orbital period of 0.75 yr, or about 275 days.

An eccentricity of 0.312 makes the orbit moderately elongated.

A steep inclination of 22.84° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 45.2 km/s at perihelion and falls to 23.7 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 = 23.48 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.07 km.

Observation record and orbit quality

The current orbit solution is based on 87 observations and has a weighted RMS residual of 0.5319 arcseconds.

Condition code U = 2 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
0.8282 AU
Eccentricity
0.3121
Perihelion
0.57 AU
Aphelion
1.086681 AU
Inclination
22.84°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
164.38°

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-Feb-21 20:48 0.208914 AU
31253072 km
13.69 km/s
2027-Jul-17 01:07 0.464847 AU
69540090 km
16.61 km/s
2030-Feb-18 07:04 0.269078 AU
40253492 km
15.10 km/s
2030-Jul-27 11:28 0.461577 AU
69050905 km
18.32 km/s
2033-Feb-16 08:39 0.337697 AU
50518732 km
17.08 km/s
2033-Aug-06 08:25 0.456273 AU
68257410 km
19.58 km/s
2036-Feb-17 03:05 0.411974 AU
61630478 km
19.47 km/s
2036-Aug-15 18:42 0.450220 AU
67351916 km
20.44 km/s
2039-Feb-18 02:47 0.490492 AU
73376557 km
22.12 km/s
2039-Aug-26 01:01 0.444444 AU
66487867 km
21.00 km/s
2042-Sep-04 03:53 0.439468 AU
65743433 km
21.27 km/s
2045-Sep-13 04:15 0.436070 AU
65235132 km
21.25 km/s
2046-Mar-22 10:02 0.483643 AU
72352036 km
22.82 km/s
2048-Sep-22 06:30 0.434058 AU
64934221 km
20.97 km/s
2049-Mar-23 18:25 0.403071 AU
60298533 km
20.21 km/s
2051-Oct-02 10:07 0.433846 AU
64902454 km
20.40 km/s
2052-Mar-24 04:37 0.326165 AU
48793533 km
17.82 km/s
2054-Oct-11 18:57 0.434613 AU
65017160 km
19.54 km/s
2055-Mar-24 07:40 0.254424 AU
38061236 km
15.76 km/s
2057-Oct-21 10:43 0.436077 AU
65236152 km
18.31 km/s
2058-Mar-21 22:34 0.190590 AU
28511870 km
14.17 km/s
2060-Oct-31 15:53 0.436844 AU
65350903 km
16.65 km/s
2061-Mar-18 04:12 0.138233 AU
20679368 km
13.11 km/s
2063-Nov-13 01:26 0.435425 AU
65138701 km
14.30 km/s
2064-Mar-13 11:01 0.102898 AU
15393346 km
12.53 km/s
2066-Nov-30 02:44 0.427466 AU
63948037 km
9.56 km/s
2067-Mar-09 06:38 0.094176 AU
14088539 km
12.31 km/s
2070-Mar-03 21:01 0.114108 AU
17070249 km
12.39 km/s
2070-Jun-15 18:59 0.453636 AU
67862985 km
8.93 km/s
2073-Feb-26 11:43 0.153068 AU
22898708 km
12.78 km/s
2073-Jul-03 15:38 0.463614 AU
69355667 km
13.91 km/s
2076-Feb-22 15:28 0.203353 AU
30421136 km
13.60 km/s
2076-Jul-15 12:16 0.464752 AU
69525922 km
16.44 km/s
2079-Feb-18 21:40 0.263283 AU
39386589 km
14.96 km/s
2079-Jul-27 01:27 0.461824 AU
69087924 km
18.20 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
23.48

Orbit Quality

RMS
0.5319
Condition
2
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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