SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 NX

2018 NX

2018 NX is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.898 AU and a period of 0.85 yr.

Aten Observations: 29
Orbital Period · P
0.85 yr
v(q)
36.4 km/s
v(Q)
27.1 km/s
Diameter · ≈
0.01 km
TJ
6.62
Eccentricity · e
0.1464

Orbit and dynamics

Between its closest point (0.766 AU) and its farthest (1.029 AU), the heliocentric distance changes by 0.263 AU over every revolution.

One full revolution takes 0.85 yr (311 days), computed from the semi-major axis of 0.898 AU.

An eccentricity of 0.146 makes the orbit moderately elongated.

Its inclination of 4.06° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 36.4 km/s at perihelion and falls to 27.1 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 = 27.7 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

Astrometry from 29 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3095 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
0.8979 AU
Eccentricity
0.1464
Perihelion
0.766 AU
Aphelion
1.029353 AU
Inclination
4.06°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
261.19°

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-Jul-06 00:35 0.371927 AU
55639535 km
14.40 km/s
2030-Jan-26 09:58 0.219131 AU
32781584 km
6.55 km/s
2030-Aug-25 05:19 0.419833 AU
62806159 km
15.61 km/s
2035-Jun-28 15:06 0.115281 AU
17245858 km
6.75 km/s
2035-Dec-03 19:11 0.176594 AU
26418133 km
4.81 km/s
2041-Aug-21 03:25 0.054068 AU
8088518 km
3.33 km/s
2047-Feb-20 06:22 0.219399 AU
32821633 km
6.20 km/s
2047-Aug-30 08:59 0.307371 AU
45982114 km
11.95 km/s
2052-Jun-30 00:19 0.209484 AU
31338309 km
9.32 km/s
2052-Dec-22 07:56 0.200059 AU
29928466 km
5.81 km/s
2058-Aug-14 19:10 0.048488 AU
7253676 km
3.11 km/s
2063-Jul-09 17:03 0.436748 AU
65336564 km
16.52 km/s
2064-Feb-08 07:52 0.223820 AU
33483052 km
6.55 km/s
2064-Aug-26 15:33 0.362850 AU
54281549 km
14.00 km/s
2069-Jun-28 07:14 0.064857 AU
9702427 km
5.47 km/s
2069-Nov-20 04:02 0.159917 AU
23923316 km
4.03 km/s
2075-Mar-24 21:46 0.197763 AU
29584993 km
4.70 km/s
2075-Sep-03 17:20 0.170379 AU
25488344 km
7.66 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
27.7

Orbit Quality

RMS
0.30946
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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