SpaceAtlas Space Object Data
NASA JPL SBDB · 2016 AJ9

2016 AJ9

2016 AJ9 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 2.524 AU once every 4.01 yr.

Amor Observations: 47
Orbital Period · P
4.01 yr
v(q)
35.7 km/s
v(Q)
9.9 km/s
Diameter · ≈
0.05 km
TJ
3.19
Eccentricity · e
0.567

Orbit and dynamics

Between its closest point (1.093 AU) and its farthest (3.955 AU), the heliocentric distance changes by 2.862 AU over every revolution.

One full revolution takes 4.01 yr (1,465 days), computed from the semi-major axis of 2.524 AU.

The high eccentricity (0.567) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 10.64° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 35.7 km/s at perihelion and falls to 9.9 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 = 24.18 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.05 km.

Observation record and orbit quality

Astrometry from 47 individual observations underpins this orbit; the fit leaves an RMS residual of 0.8461 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
2.524 AU
Eccentricity
0.567
Perihelion
1.093 AU
Aphelion
3.955108 AU
Inclination
10.64°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
221.78°

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
2028-Jan-01 09:40 0.156405 AU
23397824 km
9.61 km/s
2032-Jan-04 21:07 0.181090 AU
27090640 km
10.57 km/s
2036-Jan-06 10:56 0.198220 AU
29653361 km
11.10 km/s
2040-Jan-10 20:37 0.262822 AU
39317685 km
12.76 km/s
2044-Jan-14 19:01 0.298657 AU
44678460 km
14.13 km/s
2048-Jan-15 14:13 0.306570 AU
45862226 km
14.43 km/s
2052-Jan-18 06:40 0.354622 AU
53050681 km
15.67 km/s
2056-Jan-20 19:39 0.367132 AU
54922229 km
16.45 km/s
2060-Jan-19 07:49 0.334629 AU
50059784 km
15.64 km/s
2064-Jan-19 03:38 0.338859 AU
50692615 km
15.65 km/s
2068-Jan-19 10:48 0.310345 AU
46426970 km
15.32 km/s
2072-Jan-14 01:23 0.227127 AU
33977669 km
13.09 km/s
2076-Jan-10 04:39 0.183548 AU
27458323 km
11.82 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
24.18

Orbit Quality

RMS
0.84608
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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