SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 DC4

2018 DC4

2018 DC4 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.919 AU and a period of 0.88 yr.

Aten Observations: 19
Orbital Period · P
0.88 yr
v(q)
35.4 km/s
v(Q)
27.2 km/s
Diameter · ≈
0.01 km
TJ
6.49
Eccentricity · e
0.1308

Orbit and dynamics

Between its closest point (0.799 AU) and its farthest (1.039 AU), the heliocentric distance changes by 0.24 AU over every revolution.

One full revolution takes 0.88 yr (322 days), computed from the semi-major axis of 0.919 AU.

An eccentricity of 0.131 makes the orbit moderately elongated.

Its inclination of 2.44° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 35.4 km/s at perihelion and falls to 27.2 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 = 27.3 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

Astrometry from 19 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3354 arcseconds.

Condition code U = 6 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
0.9192 AU
Eccentricity
0.1308
Perihelion
0.799 AU
Aphelion
1.039431 AU
Inclination
2.44°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
16.4°

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
2031-Dec-07 05:34 0.305326 AU
45676066 km
14.54 km/s
2032-Aug-06 09:31 0.207864 AU
31095962 km
6.08 km/s
2033-Mar-07 13:57 0.125271 AU
18740290 km
9.09 km/s
2046-Dec-02 22:40 0.200315 AU
29966665 km
11.44 km/s
2047-Jul-17 12:18 0.218472 AU
32682999 km
6.22 km/s
2048-Mar-03 13:22 0.227848 AU
34085598 km
12.27 km/s
2054-Sep-21 11:44 0.156137 AU
23357782 km
4.25 km/s
2055-Feb-28 13:15 0.011002 AU
1645881 km
3.44 km/s
2061-Nov-30 19:34 0.145005 AU
21692451 km
11.16 km/s
2063-Mar-04 07:15 0.142338 AU
21293532 km
11.88 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
27.3

Orbit Quality

RMS
0.33541
Condition
6
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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