SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 JJ2

2015 JJ2

2015 JJ2 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 2.171 AU once every 3.20 yr.

Amor Observations: 136
Orbital Period · P
3.20 yr
v(q)
34.7 km/s
v(Q)
11.8 km/s
Diameter · ≈
0.16 km
TJ
3.51
Eccentricity · e
0.493

Orbit and dynamics

The path is an ellipse reaching 1.101 AU from the Sun at perihelion and 3.241 AU at aphelion, a radial span of 2.14 AU.

Applying Kepler's third law to a = 2.171 AU gives an orbital period of 3.20 yr, or about 1,168 days.

The high eccentricity (0.493) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 6.6° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 34.7 km/s at perihelion and falls to 11.8 km/s at aphelion.

Its perihelion lies just outside Earth's orbit, which is why it is classed as Earth-approaching rather than Earth-crossing.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 21.8 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.16 km.

Observation record and orbit quality

The current orbit solution is based on 136 observations and has a weighted RMS residual of 0.384 arcseconds.

Condition code U = 5 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
2.171 AU
Eccentricity
0.493
Perihelion
1.101 AU
Aphelion
3.241303 AU
Inclination
6.6°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
145.78°

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-Jul-03 20:35 0.159764 AU
23900353 km
9.23 km/s
2047-Jun-24 14:44 0.272054 AU
40698675 km
12.59 km/s
2063-Jun-12 12:20 0.438960 AU
65667489 km
17.83 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
21.8

Orbit Quality

RMS
0.38395
Condition
5
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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