SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 KR

2018 KR

2018 KR is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.887 AU and a period of 0.84 yr.

Aten Observations: 56
Orbital Period · P
0.84 yr
v(q)
39.1 km/s
v(Q)
25.6 km/s
Diameter · ≈
0.02 km
TJ
6.67
Eccentricity · e
0.2096

Orbit and dynamics

The path is an ellipse reaching 0.701 AU from the Sun at perihelion and 1.073 AU at aphelion, a radial span of 0.372 AU.

Applying Kepler's third law to a = 0.887 AU gives an orbital period of 0.84 yr, or about 305 days.

An eccentricity of 0.21 makes the orbit moderately elongated.

Its inclination of 1.18° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 39.1 km/s at perihelion and falls to 25.6 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 = 26.39 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 56 observations and has a weighted RMS residual of 0.4734 arcseconds.

Condition code U = 0 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
0.887 AU
Eccentricity
0.2096
Perihelion
0.701 AU
Aphelion
1.072915 AU
Inclination
1.18°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
93.15°

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-Dec-31 14:12 0.223375 AU
33416359 km
5.67 km/s
2028-Jun-06 00:39 0.021603 AU
3231812 km
4.62 km/s
2033-Apr-21 09:23 0.070052 AU
10479658 km
4.02 km/s
2038-Mar-14 07:46 0.019422 AU
2905420 km
4.70 km/s
2038-Aug-19 06:58 0.225383 AU
33716812 km
5.35 km/s
2043-Mar-10 14:43 0.052494 AU
7852954 km
6.56 km/s
2043-Sep-03 10:24 0.248948 AU
37242121 km
6.58 km/s
2048-Mar-11 22:07 0.156107 AU
23353209 km
9.82 km/s
2048-Sep-20 18:54 0.272887 AU
40823378 km
7.90 km/s
2053-Mar-15 02:26 0.240446 AU
35970159 km
12.46 km/s
2053-Oct-05 04:03 0.284967 AU
42630527 km
8.60 km/s
2054-May-27 09:38 0.482555 AU
72189199 km
19.92 km/s
2058-Mar-19 00:31 0.330068 AU
49377544 km
15.26 km/s
2058-Oct-19 10:46 0.290800 AU
43503081 km
8.99 km/s
2059-May-29 00:37 0.405252 AU
60624786 km
17.43 km/s
2063-Mar-18 18:47 0.323245 AU
48356812 km
15.03 km/s
2063-Oct-15 12:44 0.290690 AU
43486651 km
8.93 km/s
2064-May-27 07:35 0.428084 AU
64040433 km
18.22 km/s
2068-Mar-17 04:09 0.297285 AU
44473141 km
14.35 km/s
2068-Oct-11 09:09 0.289143 AU
43255203 km
8.86 km/s
2069-May-26 18:09 0.445953 AU
66713555 km
18.90 km/s
2073-Mar-15 22:10 0.266613 AU
39884741 km
13.56 km/s
2073-Oct-09 22:15 0.287753 AU
43047259 km
8.79 km/s
2074-May-28 03:21 0.447679 AU
66971852 km
18.94 km/s
2078-Mar-19 17:46 0.323529 AU
48399269 km
16.26 km/s
2078-Oct-23 17:30 0.291304 AU
43578454 km
9.06 km/s
2079-May-31 21:51 0.316324 AU
47321432 km
16.30 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
26.39

Orbit Quality

RMS
0.47343
Condition
0
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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