SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 RC

2018 RC

2018 RC is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.883 AU and a period of 0.83 yr.

Aten Observations: 232
Orbital Period · P
0.83 yr
v(q)
39.6 km/s
v(Q)
25.4 km/s
Diameter · ≈
0.04 km
TJ
6.7
Eccentricity · e
0.2196

Orbit and dynamics

The path is an ellipse reaching 0.689 AU from the Sun at perihelion and 1.076 AU at aphelion, a radial span of 0.387 AU.

Applying Kepler's third law to a = 0.883 AU gives an orbital period of 0.83 yr, or about 303 days.

An eccentricity of 0.22 makes the orbit moderately elongated.

Its inclination of 1.72° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 39.6 km/s at perihelion and falls to 25.4 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 = 24.93 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.04 km.

Observation record and orbit quality

The current orbit solution is based on 232 observations and has a weighted RMS residual of 0.4062 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
0.8826 AU
Eccentricity
0.2196
Perihelion
0.689 AU
Aphelion
1.076419 AU
Inclination
1.72°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
3.77°

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
2027-Jun-29 16:48 0.470708 AU
70416974 km
19.39 km/s
2028-Feb-11 06:57 0.292934 AU
43822354 km
9.23 km/s
2028-Sep-04 16:19 0.299582 AU
44816850 km
14.19 km/s
2032-Jun-22 22:14 0.325432 AU
48683870 km
14.89 km/s
2033-Jan-18 18:52 0.294775 AU
44097776 km
9.36 km/s
2033-Aug-29 16:53 0.447339 AU
66920932 km
18.75 km/s
2037-Jun-17 15:26 0.175505 AU
26255242 km
10.25 km/s
2037-Dec-25 20:37 0.277903 AU
41573759 km
8.37 km/s
2042-Jun-29 04:34 0.042195 AU
6312330 km
4.09 km/s
2042-Nov-08 20:54 0.203632 AU
30462928 km
4.17 km/s
2047-Apr-03 11:51 0.231655 AU
34655157 km
5.74 km/s
2047-Sep-10 06:43 0.017825 AU
2666576 km
5.47 km/s
2051-Jun-30 04:25 0.437493 AU
65448069 km
18.37 km/s
2052-Feb-03 08:27 0.300128 AU
44898481 km
9.53 km/s
2052-Sep-01 02:45 0.377554 AU
56481323 km
16.60 km/s
2056-Jun-17 09:26 0.082544 AU
12348414 km
7.33 km/s
2056-Dec-06 17:52 0.254352 AU
38050534 km
6.97 km/s
2061-Apr-04 23:25 0.231688 AU
34660007 km
5.72 km/s
2061-Sep-10 05:03 0.018119 AU
2710562 km
5.57 km/s
2065-Jun-27 06:10 0.341303 AU
51058264 km
15.71 km/s
2066-Jan-19 18:00 0.301631 AU
45123334 km
9.59 km/s
2066-Aug-28 04:47 0.472507 AU
70686066 km
19.95 km/s
2074-Jul-02 20:25 0.448799 AU
67139387 km
19.78 km/s
2075-Feb-08 18:45 0.299654 AU
44827573 km
9.55 km/s
2075-Sep-02 20:55 0.318633 AU
47666782 km
15.89 km/s
2079-Jun-21 02:58 0.028162 AU
4212937 km
5.38 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
24.93

Orbit Quality

RMS
0.40615
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.

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