SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 UG20

2011 UG20

2011 UG20 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.124 AU it takes 1.19 yr to circle the Sun.

Apollo Observations: 106
Orbital Period · P
1.19 yr
v(q)
65.2 km/s
v(Q)
12.1 km/s
Diameter · ≈
0.18 km
TJ
5.27
Eccentricity · e
0.6868

Orbit and dynamics

Between its closest point (0.352 AU) and its farthest (1.896 AU), the heliocentric distance changes by 1.544 AU over every revolution.

One full revolution takes 1.19 yr (435 days), computed from the semi-major axis of 1.124 AU.

The high eccentricity (0.687) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 18.99° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 65.2 km/s at perihelion and falls to 12.1 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 = 21.44 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.18 km.

Observation record and orbit quality

Astrometry from 106 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5787 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
1.124 AU
Eccentricity
0.6868
Perihelion
0.352 AU
Aphelion
1.895963 AU
Inclination
18.99°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
51.1°

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
2033-Jul-13 16:45 0.490735 AU
73412843 km
34.82 km/s
2036-Oct-22 17:07 0.361536 AU
54085033 km
15.85 km/s
2039-Jul-02 11:04 0.348664 AU
52159372 km
28.10 km/s
2042-Oct-22 22:59 0.132283 AU
19789208 km
20.16 km/s
2045-Jun-19 00:10 0.312115 AU
46691701 km
21.75 km/s
2048-Oct-14 19:55 0.090484 AU
13536185 km
26.29 km/s
2051-May-29 14:55 0.406370 AU
60792099 km
17.64 km/s
2054-Oct-05 16:34 0.315274 AU
47164246 km
33.10 km/s
2064-Jul-13 05:38 0.486096 AU
72718952 km
34.60 km/s
2067-Oct-23 18:53 0.356877 AU
53388087 km
15.89 km/s
2070-Jul-02 09:37 0.350113 AU
52376120 km
28.10 km/s
2073-Oct-22 23:57 0.138411 AU
20706029 km
20.03 km/s
2076-Jun-19 10:21 0.311817 AU
46647211 km
21.96 km/s
2079-Oct-16 00:48 0.082887 AU
12399698 km
26.09 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
21.44

Orbit Quality

RMS
0.57869
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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