SpaceAtlas Space Object Data
NASA JPL SBDB · 2013 NJ4

2013 NJ4

2013 NJ4 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.136 AU it takes 1.21 yr to circle the Sun.

Apollo Observations: 14
Orbital Period · P
1.21 yr
v(q)
34.3 km/s
v(Q)
22.7 km/s
Diameter · ≈
0.01 km
TJ
5.5
Eccentricity · e
0.2032

Orbit and dynamics

Between its closest point (0.905 AU) and its farthest (1.367 AU), the heliocentric distance changes by 0.462 AU over every revolution.

One full revolution takes 1.21 yr (442 days), computed from the semi-major axis of 1.136 AU.

An eccentricity of 0.203 makes the orbit moderately elongated.

Its inclination of 1.33° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 34.3 km/s at perihelion and falls to 22.7 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 14 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4836 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
1.136 AU
Eccentricity
0.2032
Perihelion
0.905 AU
Aphelion
1.366835 AU
Inclination
1.33°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
206.49°

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
2031-Mar-25 13:49 0.365707 AU
54708925 km
7.09 km/s
2031-Dec-08 01:34 0.329583 AU
49304897 km
15.88 km/s
2036-Jun-18 08:34 0.233904 AU
34991468 km
13.77 km/s
2037-Feb-22 14:38 0.355442 AU
53173361 km
7.07 km/s
2043-Jan-17 00:52 0.243361 AU
36406218 km
5.48 km/s
2048-Nov-22 05:44 0.018614 AU
2784612 km
7.54 km/s
2053-Jun-11 04:34 0.201198 AU
30098838 km
18.39 km/s
2060-Jan-16 09:08 0.164078 AU
24545773 km
5.53 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
0.48356
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.