SpaceAtlas Space Object Data
NASA JPL SBDB · 2019 AR9

2019 AR9

2019 AR9 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.678 AU once every 2.17 yr.

Amor Observations: 26
Orbital Period · P
2.17 yr
v(q)
32.5 km/s
v(Q)
16.3 km/s
Diameter · ≈
0.16 km
TJ
4.08
Eccentricity · e
0.3335

Orbit and dynamics

Between its closest point (1.118 AU) and its farthest (2.238 AU), the heliocentric distance changes by 1.12 AU over every revolution.

One full revolution takes 2.17 yr (794 days), computed from the semi-major axis of 1.678 AU.

An eccentricity of 0.334 makes the orbit moderately elongated.

A steep inclination of 23.96° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 32.5 km/s at perihelion and falls to 16.3 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 = 21.7 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.16 km.

Observation record and orbit quality

Astrometry from 26 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3722 arcseconds.

Condition code U = 7 signals a poorly constrained orbit, so its future path should be treated as provisional.

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
1.678 AU
Eccentricity
0.3335
Perihelion
1.118 AU
Aphelion
2.237613 AU
Inclination
23.96°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
204.21°

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-Dec-29 08:40 0.463412 AU
69325522 km
12.16 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
21.7

Orbit Quality

RMS
0.37222
Condition
7
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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