SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 JO1

2018 JO1

2018 JO1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.182 AU it takes 1.29 yr to circle the Sun.

Apollo Observations: 103
Orbital Period · P
1.29 yr
v(q)
33.6 km/s
v(Q)
22.4 km/s
Diameter · ≈
0.04 km
TJ
5.32
Eccentricity · e
0.2004

Orbit and dynamics

The path is an ellipse reaching 0.945 AU from the Sun at perihelion and 1.419 AU at aphelion, a radial span of 0.474 AU.

Applying Kepler's third law to a = 1.182 AU gives an orbital period of 1.29 yr, or about 469 days.

An eccentricity of 0.2 makes the orbit moderately elongated.

The orbital plane is tilted 10.48° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 33.6 km/s at perihelion and falls to 22.4 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 = 25 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.04 km.

Observation record and orbit quality

The current orbit solution is based on 103 observations and has a weighted RMS residual of 0.4085 arcseconds.

Condition code U = 6 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
1.182 AU
Eccentricity
0.2004
Perihelion
0.945 AU
Aphelion
1.418873 AU
Inclination
10.48°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
149.77°

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
2026-Dec-03 22:51 0.201341 AU
30120240 km
6.24 km/s
2027-Apr-30 17:29 0.029314 AU
4385298 km
6.59 km/s
2031-Sep-12 22:17 0.448417 AU
67082178 km
7.67 km/s
2035-Dec-20 06:23 0.159034 AU
23791208 km
6.19 km/s
2036-Apr-06 06:38 0.144817 AU
21664385 km
5.77 km/s
2040-Sep-25 06:14 0.430558 AU
64410593 km
7.85 km/s
2044-Dec-26 11:05 0.185562 AU
27759649 km
9.00 km/s
2045-Jun-13 08:30 0.301518 AU
45106456 km
4.95 km/s
2049-Oct-10 16:22 0.394718 AU
59049005 km
7.85 km/s
2050-May-28 16:49 0.454385 AU
67975055 km
19.11 km/s
2053-Dec-22 16:31 0.316804 AU
47393186 km
13.92 km/s
2054-Jul-20 06:34 0.391186 AU
58520553 km
5.69 km/s
2058-Oct-27 21:05 0.339347 AU
50765602 km
7.58 km/s
2059-May-20 04:07 0.278376 AU
41644493 km
14.28 km/s
2062-Dec-16 06:43 0.482130 AU
72125560 km
19.15 km/s
2063-Aug-12 22:47 0.436048 AU
65231869 km
6.64 km/s
2067-Nov-15 06:37 0.269618 AU
40334232 km
6.98 km/s
2068-May-10 04:01 0.107173 AU
16032906 km
9.79 km/s
2072-Aug-29 03:35 0.451960 AU
67612278 km
7.26 km/s
2076-Dec-01 02:24 0.210950 AU
31557716 km
6.33 km/s
2077-May-01 15:44 0.022855 AU
3419011 km
6.89 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
25.0

Orbit Quality

RMS
0.40852
Condition
6
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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