SpaceAtlas Space Object Data
NASA JPL SBDB · 2008 JJ

2008 JJ

2008 JJ is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.742 AU once every 2.30 yr.

Amor Observations: 288
Orbital Period · P
2.30 yr
v(q)
33.6 km/s
v(Q)
15.1 km/s
Diameter · ≈
0.51 km
TJ
3.75
Eccentricity · e
0.379

Orbit and dynamics

Between its closest point (1.082 AU) and its farthest (2.402 AU), the heliocentric distance changes by 1.32 AU over every revolution.

One full revolution takes 2.30 yr (840 days), computed from the semi-major axis of 1.742 AU.

An eccentricity of 0.379 makes the orbit moderately elongated.

A steep inclination of 44.54° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 33.6 km/s at perihelion and falls to 15.1 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 = 19.23 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.51 km.

Observation record and orbit quality

Astrometry from 288 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4279 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
1.742 AU
Eccentricity
0.379
Perihelion
1.082 AU
Aphelion
2.402218 AU
Inclination
44.54°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
281.89°

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-Jun-06 09:44 0.142401 AU
21302928 km
23.70 km/s
2054-Jun-06 14:24 0.145986 AU
21839123 km
23.63 km/s
2077-Jun-06 17:18 0.149585 AU
22377532 km
23.57 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
19.23

Orbit Quality

RMS
0.42789
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.

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