SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 PR7

2018 PR7

2018 PR7 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.026 AU it takes 1.04 yr to circle the Sun.

Apollo Observations: 55
Orbital Period · P
1.04 yr
v(q)
32.8 km/s
v(Q)
26.3 km/s
Diameter · ≈
0.01 km
TJ
5.95
Eccentricity · e
0.1097

Orbit and dynamics

Between its closest point (0.914 AU) and its farthest (1.139 AU), the heliocentric distance changes by 0.225 AU over every revolution.

One full revolution takes 1.04 yr (380 days), computed from the semi-major axis of 1.026 AU.

An eccentricity of 0.11 makes the orbit moderately elongated.

Its inclination of 4.44° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 32.8 km/s at perihelion and falls to 26.3 km/s at aphelion.

Because q < 1 AU and Q > 1 AU, this orbit geometrically intersects the region of Earth's orbit.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 28.5 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

Astrometry from 55 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4333 arcseconds.

Condition code U = 4 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
1.026 AU
Eccentricity
0.1097
Perihelion
0.914 AU
Aphelion
1.138552 AU
Inclination
4.44°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
274.49°

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-Jan-24 10:37 0.459416 AU
68727598 km
17.65 km/s
2042-Feb-03 17:34 0.212981 AU
31861457 km
10.26 km/s
2043-Feb-12 12:33 0.032276 AU
4828408 km
3.44 km/s
2043-Nov-14 23:06 0.170003 AU
25432085 km
3.74 km/s
2044-Jul-28 07:55 0.069046 AU
10329200 km
2.70 km/s
2045-Aug-12 03:47 0.180484 AU
27000019 km
9.10 km/s
2046-Aug-23 05:01 0.429881 AU
64309274 km
16.37 km/s
2067-Jan-30 01:01 0.284025 AU
42489524 km
13.09 km/s
2068-Feb-09 14:16 0.025502 AU
3814990 km
5.55 km/s
2068-Dec-13 20:33 0.142606 AU
21333537 km
3.47 km/s
2069-May-12 21:10 0.120679 AU
18053263 km
3.33 km/s
2069-Oct-01 05:52 0.141348 AU
21145322 km
3.28 km/s
2070-Aug-07 18:57 0.051877 AU
7760649 km
5.68 km/s
2071-Aug-19 00:44 0.302170 AU
45203939 km
12.73 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
28.5

Orbit Quality

RMS
0.43333
Condition
4
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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