SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 JL1

2018 JL1

2018 JL1 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.981 AU and a period of 0.97 yr.

Aten Observations: 39
Orbital Period · P
0.97 yr
v(q)
36 km/s
v(Q)
25.1 km/s
Diameter · ≈
0.02 km
TJ
6.16
Eccentricity · e
0.1775

Orbit and dynamics

Between its closest point (0.806 AU) and its farthest (1.155 AU), the heliocentric distance changes by 0.349 AU over every revolution.

One full revolution takes 0.97 yr (355 days), computed from the semi-major axis of 0.981 AU.

An eccentricity of 0.177 makes the orbit moderately elongated.

The orbital plane is tilted 5.15° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 36 km/s at perihelion and falls to 25.1 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 = 26.7 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

Astrometry from 39 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3859 arcseconds.

Condition code U = 5 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
0.9805 AU
Eccentricity
0.1775
Perihelion
0.806 AU
Aphelion
1.154539 AU
Inclination
5.15°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
21.81°

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
2045-Dec-30 02:45 0.402237 AU
60173811 km
18.31 km/s
2046-Dec-22 10:15 0.224958 AU
33653261 km
12.90 km/s
2047-Dec-14 05:46 0.057326 AU
8575918 km
7.62 km/s
2048-Nov-16 03:33 0.114357 AU
17107626 km
4.24 km/s
2049-Sep-26 05:42 0.199346 AU
29821696 km
6.21 km/s
2050-Feb-22 10:02 0.188917 AU
28261535 km
4.96 km/s
2050-Aug-18 19:39 0.214406 AU
32074713 km
6.34 km/s
2051-Apr-07 10:32 0.147836 AU
22115881 km
4.50 km/s
2051-Jul-03 06:04 0.163039 AU
24390221 km
4.47 km/s
2052-May-13 20:56 0.002096 AU
313516 km
5.88 km/s
2053-May-10 00:09 0.086205 AU
12896010 km
9.44 km/s
2054-May-05 02:11 0.176073 AU
26340194 km
13.27 km/s
2055-Apr-29 21:31 0.267739 AU
40053222 km
17.17 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
26.7

Orbit Quality

RMS
0.38586
Condition
5
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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