SpaceAtlas Space Object Data
NASA JPL SBDB · 2013 UB

2013 UB

2013 UB is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.848 AU and a period of 0.78 yr.

Aten Observations: 79
Orbital Period · P
0.78 yr
v(q)
44.8 km/s
v(Q)
23.4 km/s
Diameter · ≈
0.02 km
TJ
6.91
Eccentricity · e
0.3148

Orbit and dynamics

The path is an ellipse reaching 0.581 AU from the Sun at perihelion and 1.114 AU at aphelion, a radial span of 0.533 AU.

Applying Kepler's third law to a = 0.848 AU gives an orbital period of 0.78 yr, or about 285 days.

An eccentricity of 0.315 makes the orbit moderately elongated.

Its inclination of 3.22° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 44.8 km/s at perihelion and falls to 23.4 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 = 26.6 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 79 observations and has a weighted RMS residual of 0.4118 arcseconds.

Condition code U = 3 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
0.8476 AU
Eccentricity
0.3148
Perihelion
0.581 AU
Aphelion
1.114424 AU
Inclination
3.22°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
327.05°

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-Sep-13 05:24 0.113056 AU
16912929 km
6.29 km/s
2030-Aug-11 00:56 0.485000 AU
72554955 km
22.95 km/s
2031-Mar-15 14:48 0.411830 AU
61608840 km
14.78 km/s
2031-Oct-10 10:46 0.395292 AU
59134897 km
20.31 km/s
2034-Aug-13 03:37 0.092685 AU
13865478 km
6.21 km/s
2034-Dec-28 16:30 0.312880 AU
46806228 km
8.15 km/s
2038-Mar-29 10:09 0.404407 AU
60498405 km
14.13 km/s
2038-Oct-15 00:12 0.275224 AU
41172985 km
16.49 km/s
2041-Jul-28 03:14 0.060631 AU
9070305 km
8.42 km/s
2042-Jan-16 22:34 0.357517 AU
53483731 km
11.10 km/s
2045-Apr-14 09:14 0.385483 AU
57667487 km
12.69 km/s
2045-Oct-19 07:51 0.141322 AU
21141449 km
12.24 km/s
2048-Jul-29 02:08 0.163010 AU
24385876 km
12.51 km/s
2049-Feb-03 12:53 0.388532 AU
58123602 km
13.22 km/s
2052-May-01 14:39 0.354644 AU
53054055 km
10.55 km/s
2052-Oct-20 01:00 0.015237 AU
2279449 km
8.34 km/s
2055-Aug-01 15:44 0.225632 AU
33754138 km
14.59 km/s
2056-Feb-11 10:57 0.399595 AU
59778547 km
13.95 km/s
2059-Apr-29 20:16 0.362619 AU
54247010 km
11.05 km/s
2059-Oct-21 05:30 0.043149 AU
6454942 km
9.18 km/s
2062-Jul-30 23:45 0.173527 AU
25959309 km
12.88 km/s
2063-Feb-04 10:34 0.391358 AU
58546270 km
13.36 km/s
2066-Apr-18 06:48 0.384295 AU
57489653 km
12.51 km/s
2066-Oct-19 21:46 0.133259 AU
19935241 km
12.00 km/s
2069-Jul-29 03:05 0.087417 AU
13077326 km
9.80 km/s
2070-Jan-22 05:57 0.369723 AU
55309755 km
11.85 km/s
2073-Apr-05 14:12 0.401009 AU
59990111 km
13.75 km/s
2073-Oct-16 18:13 0.231557 AU
34640414 km
15.10 km/s
2076-Jul-30 23:33 0.056967 AU
8522185 km
7.51 km/s
2077-Jan-11 00:14 0.346404 AU
51821253 km
10.29 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
26.6

Orbit Quality

RMS
0.41177
Condition
3
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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