SpaceAtlas Space Object Data
NASA JPL SBDB · 2013 UB3

2013 UB3

2013 UB3 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.884 AU and a period of 0.83 yr.

Aten Observations: 39
Orbital Period · P
0.83 yr
v(q)
38.7 km/s
v(Q)
25.9 km/s
Diameter · ≈
0.02 km
TJ
6.69
Eccentricity · e
0.198

Orbit and dynamics

Between its closest point (0.709 AU) and its farthest (1.059 AU), the heliocentric distance changes by 0.35 AU over every revolution.

One full revolution takes 0.83 yr (303 days), computed from the semi-major axis of 0.884 AU.

An eccentricity of 0.198 makes the orbit moderately elongated.

Its inclination of 4.79° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 38.7 km/s at perihelion and falls to 25.9 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 = 25.8 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

Astrometry from 39 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3987 arcseconds.

Condition code U = 1 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
0.8836 AU
Eccentricity
0.198
Perihelion
0.709 AU
Aphelion
1.058553 AU
Inclination
4.79°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
253.72°

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-Jun-07 15:40 0.263142 AU
39365418 km
7.38 km/s
2028-Dec-02 16:53 0.074838 AU
11195611 km
6.99 km/s
2033-Jun-28 22:20 0.230925 AU
34545847 km
5.47 km/s
2033-Nov-19 20:42 0.051770 AU
7744714 km
4.85 km/s
2038-Oct-20 13:06 0.071969 AU
10766379 km
4.73 km/s
2043-Sep-18 09:17 0.057782 AU
8644033 km
4.93 km/s
2044-Feb-15 09:59 0.232990 AU
34854867 km
6.13 km/s
2048-Sep-06 06:24 0.093365 AU
13967187 km
7.76 km/s
2049-Mar-09 06:54 0.266542 AU
39874177 km
8.06 km/s
2053-Sep-07 21:21 0.189715 AU
28380920 km
11.07 km/s
2054-Mar-27 00:09 0.285234 AU
42670333 km
9.08 km/s
2058-Sep-11 15:48 0.303049 AU
45335522 km
14.63 km/s
2059-Apr-13 23:10 0.295069 AU
44141623 km
9.52 km/s
2059-Nov-24 08:19 0.403902 AU
60422831 km
18.00 km/s
2063-Sep-16 06:48 0.429597 AU
64266803 km
18.51 km/s
2064-May-02 22:48 0.293818 AU
43954577 km
9.36 km/s
2064-Nov-29 00:52 0.276401 AU
41348936 km
13.75 km/s
2069-May-25 03:26 0.278121 AU
41606261 km
8.33 km/s
2069-Dec-03 02:16 0.136440 AU
20411137 km
9.38 km/s
2074-Jun-11 15:01 0.255955 AU
38290386 km
7.08 km/s
2074-Dec-02 04:59 0.059436 AU
8891460 km
6.52 km/s
2079-Jun-25 08:19 0.235034 AU
35160574 km
5.86 km/s
2079-Nov-24 23:48 0.047985 AU
7178507 km
5.08 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
25.8

Orbit Quality

RMS
0.39873
Condition
1
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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