SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 PQ9

2018 PQ9

2018 PQ9 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.395 AU once every 1.65 yr.

Amor Observations: 20
Orbital Period · P
1.65 yr
v(q)
30.7 km/s
v(Q)
20.7 km/s
Diameter · ≈
0.04 km
TJ
4.72
Eccentricity · e
0.1958

Orbit and dynamics

Between its closest point (1.122 AU) and its farthest (1.668 AU), the heliocentric distance changes by 0.546 AU over every revolution.

One full revolution takes 1.65 yr (602 days), computed from the semi-major axis of 1.395 AU.

An eccentricity of 0.196 makes the orbit moderately elongated.

The orbital plane is tilted 12.27° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 30.7 km/s at perihelion and falls to 20.7 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 = 24.8 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.04 km.

Observation record and orbit quality

Astrometry from 20 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3493 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
1.395 AU
Eccentricity
0.1958
Perihelion
1.122 AU
Aphelion
1.668141 AU
Inclination
12.27°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
282.78°

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
2041-Jul-27 17:29 0.200176 AU
29945925 km
11.36 km/s
2046-Aug-01 19:59 0.059215 AU
8858419 km
6.73 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
24.8

Orbit Quality

RMS
0.34928
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.

Keep exploring

Explore asteroids, comets and near-Earth objects with JPL orbital data.