SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 CB

2018 CB

2018 CB belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.409 AU it takes 1.67 yr to circle the Sun.

Apollo Observations: 209
Orbital Period · P
1.67 yr
v(q)
35 km/s
v(Q)
18 km/s
Diameter · ≈
0.02 km
TJ
4.68
Eccentricity · e
0.3201

Orbit and dynamics

The path is an ellipse reaching 0.958 AU from the Sun at perihelion and 1.86 AU at aphelion, a radial span of 0.902 AU.

Applying Kepler's third law to a = 1.409 AU gives an orbital period of 1.67 yr, or about 611 days.

An eccentricity of 0.32 makes the orbit moderately elongated.

The orbital plane is tilted 5.29° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 35 km/s at perihelion and falls to 18 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 = 25.9 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

The current orbit solution is based on 209 observations and has a weighted RMS residual of 0.2553 arcseconds.

Condition code U = 2 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
1.409 AU
Eccentricity
0.3201
Perihelion
0.958 AU
Aphelion
1.860021 AU
Inclination
5.29°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
339.04°

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-Apr-15 05:03 0.088571 AU
13250052 km
6.64 km/s
2032-Dec-23 12:40 0.385373 AU
57651044 km
3.89 km/s
2033-May-04 07:50 0.182401 AU
27286813 km
10.68 km/s
2037-Dec-03 14:57 0.486507 AU
72780338 km
6.32 km/s
2038-May-15 18:01 0.329733 AU
49327309 km
15.42 km/s
2043-May-25 08:04 0.489314 AU
73200288 km
20.21 km/s
2075-Jan-11 05:19 0.333622 AU
49909205 km
16.27 km/s
2075-Jun-24 03:49 0.486717 AU
72811835 km
6.38 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
25.9

Orbit Quality

RMS
0.25531
Condition
2
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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