SpaceAtlas Space Object Data
NASA JPL SBDB · 2013 NJ

2013 NJ

2013 NJ belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.286 AU it takes 1.46 yr to circle the Sun.

Apollo Observations: 250
Orbital Period · P
1.46 yr
v(q)
35.2 km/s
v(Q)
19.6 km/s
Diameter · ≈
0.14 km
TJ
5
Eccentricity · e
0.2835

Orbit and dynamics

The path is an ellipse reaching 0.921 AU from the Sun at perihelion and 1.651 AU at aphelion, a radial span of 0.73 AU.

Applying Kepler's third law to a = 1.286 AU gives an orbital period of 1.46 yr, or about 533 days.

An eccentricity of 0.283 makes the orbit moderately elongated.

Its inclination of 3.94° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 35.2 km/s at perihelion and falls to 19.6 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 = 22.02 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.14 km.

Observation record and orbit quality

The current orbit solution is based on 250 observations and has a weighted RMS residual of 0.368 arcseconds.

Condition code U = 0 means the orbit is very well determined, leaving only a small uncertainty in the future ephemeris.

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
1.286 AU
Eccentricity
0.2835
Perihelion
0.921 AU
Aphelion
1.650581 AU
Inclination
3.94°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
238.69°

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
2032-Sep-02 17:24 0.080421 AU
12030837 km
5.44 km/s
2048-Dec-02 04:06 0.047127 AU
7050035 km
8.10 km/s
2051-Aug-05 10:43 0.146662 AU
21940260 km
10.37 km/s
2067-Nov-26 22:57 0.007190 AU
1075570 km
6.82 km/s
2070-Aug-04 11:19 0.154284 AU
23080505 km
10.73 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
22.02

Orbit Quality

RMS
0.36796
Condition
0
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

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