SpaceAtlas Space Object Data
NASA JPL SBDB · 2013 US3

2013 US3

2013 US3 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.202 AU it takes 1.32 yr to circle the Sun.

Apollo Observations: 285
Orbital Period · P
1.32 yr
v(q)
32.8 km/s
v(Q)
22.5 km/s
Diameter · ≈
0.19 km
TJ
5.25
Eccentricity · e
0.1851

Orbit and dynamics

Between its closest point (0.979 AU) and its farthest (1.424 AU), the heliocentric distance changes by 0.445 AU over every revolution.

One full revolution takes 1.32 yr (481 days), computed from the semi-major axis of 1.202 AU.

An eccentricity of 0.185 makes the orbit moderately elongated.

The orbital plane is tilted 12.32° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 32.8 km/s at perihelion and falls to 22.5 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 = 21.32 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.19 km.

Observation record and orbit quality

Astrometry from 285 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3945 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
1.202 AU
Eccentricity
0.1851
Perihelion
0.979 AU
Aphelion
1.42449 AU
Inclination
12.32°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
86.09°

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
2030-Sep-08 15:11 0.462695 AU
69218116 km
7.81 km/s
2034-Oct-03 19:47 0.438884 AU
65656119 km
8.60 km/s
2038-Oct-27 04:01 0.381264 AU
57036264 km
8.58 km/s
2042-Nov-21 09:39 0.301402 AU
45089082 km
7.71 km/s
2043-May-14 02:26 0.248649 AU
37197346 km
12.49 km/s
2046-Dec-27 23:42 0.232609 AU
34797757 km
5.65 km/s
2047-Apr-25 09:10 0.041934 AU
6273176 km
7.04 km/s
2051-Jan-27 19:20 0.338534 AU
50643933 km
11.18 km/s
2051-Jun-27 23:16 0.372980 AU
55797038 km
4.56 km/s
2055-Aug-25 00:43 0.455916 AU
68204108 km
7.03 km/s
2059-Sep-25 07:08 0.449691 AU
67272753 km
8.39 km/s
2063-Oct-22 00:49 0.394874 AU
59072307 km
8.64 km/s
2067-Nov-19 02:57 0.307633 AU
46021171 km
7.81 km/s
2068-May-14 20:42 0.273505 AU
40915715 km
13.10 km/s
2071-Dec-31 21:18 0.230533 AU
34487251 km
5.39 km/s
2072-Apr-23 06:48 0.056183 AU
8404813 km
6.93 km/s
2076-Jan-22 17:40 0.377649 AU
56495414 km
12.71 km/s
2076-Jul-12 16:01 0.395537 AU
59171490 km
4.69 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
21.32

Orbit Quality

RMS
0.39449
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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