SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 EC1

2018 EC1

2018 EC1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.141 AU it takes 1.22 yr to circle the Sun.

Apollo Observations: 36
Orbital Period · P
1.22 yr
v(q)
35.3 km/s
v(Q)
22 km/s
Diameter · ≈
0.02 km
TJ
5.45
Eccentricity · e
0.2308

Orbit and dynamics

Between its closest point (0.877 AU) and its farthest (1.404 AU), the heliocentric distance changes by 0.527 AU over every revolution.

One full revolution takes 1.22 yr (445 days), computed from the semi-major axis of 1.141 AU.

An eccentricity of 0.231 makes the orbit moderately elongated.

The orbital plane is tilted 11.38° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 35.3 km/s at perihelion and falls to 22 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 = 26.2 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

Astrometry from 36 individual observations underpins this orbit; the fit leaves an RMS residual of 0.492 arcseconds.

Condition code U = 7 signals a poorly constrained orbit, so its future path should be treated as provisional.

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
1.141 AU
Eccentricity
0.2308
Perihelion
0.877 AU
Aphelion
1.404343 AU
Inclination
11.38°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
221.82°

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
2029-Mar-07 23:31 0.158073 AU
23647400 km
15.10 km/s
2029-Nov-14 10:34 0.445424 AU
66634421 km
8.17 km/s
2040-Feb-26 11:52 0.331832 AU
49641426 km
21.90 km/s
2041-Sep-09 16:54 0.225958 AU
33802875 km
18.44 km/s
2046-Mar-22 04:44 0.037485 AU
5607749 km
7.41 km/s
2052-Aug-31 23:30 0.073614 AU
11012527 km
12.34 km/s
2057-Mar-13 02:26 0.030918 AU
4625279 km
11.94 km/s
2063-Aug-28 16:57 0.072675 AU
10872069 km
7.95 km/s
2068-Mar-03 23:36 0.291399 AU
43592640 km
17.72 km/s
2068-Nov-23 17:01 0.467317 AU
69909641 km
8.23 km/s
2074-Mar-17 12:22 0.234236 AU
35041244 km
5.92 km/s
2074-May-16 04:07 0.220107 AU
32927531 km
6.18 km/s
2074-Sep-20 21:10 0.260723 AU
39003669 km
6.77 km/s
2079-Dec-17 16:48 0.467716 AU
69969267 km
8.07 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
26.2

Orbit Quality

RMS
0.49199
Condition
7
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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