SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 RH7

2018 RH7

2018 RH7 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.966 AU and a period of 0.95 yr.

Aten Observations: 32
Orbital Period · P
0.95 yr
v(q)
40.2 km/s
v(Q)
22.8 km/s
Diameter · ≈
0.05 km
TJ
6.1
Eccentricity · e
0.2761

Orbit and dynamics

The path is an ellipse reaching 0.699 AU from the Sun at perihelion and 1.232 AU at aphelion, a radial span of 0.533 AU.

Applying Kepler's third law to a = 0.966 AU gives an orbital period of 0.95 yr, or about 347 days.

An eccentricity of 0.276 makes the orbit moderately elongated.

A steep inclination of 30.63° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 40.2 km/s at perihelion and falls to 22.8 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 = 24.3 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.05 km.

Observation record and orbit quality

The current orbit solution is based on 32 observations and has a weighted RMS residual of 0.3934 arcseconds.

Condition code U = 8 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
0.9656 AU
Eccentricity
0.2761
Perihelion
0.699 AU
Aphelion
1.232202 AU
Inclination
30.63°
Orbital Period
— yr
Epoch
2458375.5
Mean Anomaly
232.97°

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
2053-Aug-18 05:02 0.405191 AU
60615685 km
15.79 km/s
2054-Sep-04 20:16 0.281361 AU
42090942 km
15.31 km/s
2055-Feb-12 17:49 0.350535 AU
52439349 km
20.18 km/s
2055-Sep-16 10:35 0.152326 AU
22787583 km
15.43 km/s
2056-Sep-19 21:28 0.216984 AU
32460354 km
18.20 km/s
2057-Sep-16 05:29 0.380132 AU
56866983 km
24.28 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
24.3

Orbit Quality

RMS
0.39336
Condition
8
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

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