SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 JP

2018 JP

2018 JP belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.305 AU it takes 1.49 yr to circle the Sun.

Apollo Observations: 68
Orbital Period · P
1.49 yr
v(q)
33.6 km/s
v(Q)
20.2 km/s
Diameter · ≈
0.01 km
TJ
4.94
Eccentricity · e
0.2484

Orbit and dynamics

Between its closest point (0.981 AU) and its farthest (1.629 AU), the heliocentric distance changes by 0.648 AU over every revolution.

One full revolution takes 1.49 yr (545 days), computed from the semi-major axis of 1.305 AU.

An eccentricity of 0.248 makes the orbit moderately elongated.

The orbital plane is tilted 9.77° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 33.6 km/s at perihelion and falls to 20.2 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 = 27.4 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

Astrometry from 68 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5628 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
1.305 AU
Eccentricity
0.2484
Perihelion
0.981 AU
Aphelion
1.629162 AU
Inclination
9.77°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
127.94°

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-Apr-20 05:34 0.218088 AU
32625430 km
12.76 km/s
2027-Sep-30 12:21 0.393261 AU
58830941 km
6.84 km/s
2030-Apr-13 09:47 0.324432 AU
48534395 km
15.93 km/s
2030-Oct-10 15:04 0.437522 AU
65452387 km
7.80 km/s
2033-Apr-07 03:30 0.433758 AU
64889294 km
19.25 km/s
2033-Oct-19 11:01 0.477554 AU
71440995 km
8.57 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
27.4

Orbit Quality

RMS
0.56278
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.

Keep exploring

Explore asteroids, comets and near-Earth objects with JPL orbital data.