SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 SO2

2018 SO2

2018 SO2 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.836 AU and a period of 0.76 yr.

Aten Observations: 51
Orbital Period · P
0.76 yr
v(q)
45.5 km/s
v(Q)
23.3 km/s
Diameter · ≈
0.02 km
TJ
6.98
Eccentricity · e
0.3214

Orbit and dynamics

Between its closest point (0.567 AU) and its farthest (1.104 AU), the heliocentric distance changes by 0.537 AU over every revolution.

One full revolution takes 0.76 yr (279 days), computed from the semi-major axis of 0.836 AU.

An eccentricity of 0.321 makes the orbit moderately elongated.

The orbital plane is tilted 5.42° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 45.5 km/s at perihelion and falls to 23.3 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

Astrometry from 51 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5551 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
0.8357 AU
Eccentricity
0.3214
Perihelion
0.567 AU
Aphelion
1.104294 AU
Inclination
5.42°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
265.85°

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-Mar-09 18:50 0.415454 AU
62150975 km
15.21 km/s
2028-Sep-23 13:44 0.352888 AU
52791341 km
19.61 km/s
2031-Apr-20 20:54 0.349842 AU
52335574 km
10.84 km/s
2031-Oct-03 13:05 0.019972 AU
2987738 km
9.34 km/s
2034-Aug-08 11:57 0.103064 AU
15418179 km
6.44 km/s
2034-Nov-30 19:42 0.284595 AU
42574734 km
5.99 km/s
2037-Jul-19 04:15 0.208226 AU
31150180 km
13.96 km/s
2038-Jan-19 06:22 0.399060 AU
59698579 km
13.72 km/s
2041-Feb-24 16:35 0.423508 AU
63355964 km
15.64 km/s
2041-Sep-18 19:04 0.489038 AU
73159073 km
23.37 km/s
2044-Apr-02 16:18 0.391902 AU
58627725 km
13.18 km/s
2044-Sep-30 19:09 0.174923 AU
26168059 km
13.40 km/s
2047-May-24 10:38 0.279115 AU
41755020 km
5.49 km/s
2047-Sep-12 03:17 0.082836 AU
12392093 km
6.47 km/s
2050-Jul-17 02:52 0.101565 AU
15193891 km
9.52 km/s
2050-Dec-31 16:18 0.362942 AU
54295308 km
11.22 km/s
2053-Jul-25 13:06 0.363086 AU
54316908 km
19.43 km/s
2054-Feb-09 02:59 0.418716 AU
62639031 km
15.32 km/s
2057-Mar-17 14:16 0.408469 AU
61106099 km
14.76 km/s
2057-Sep-26 10:16 0.275039 AU
41145242 km
17.64 km/s
2060-Apr-28 08:58 0.326040 AU
48774924 km
9.63 km/s
2060-Oct-01 02:09 0.006142 AU
918767 km
7.95 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
0.55514
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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