SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 UB276

2011 UB276

2011 UB276 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.506 AU it takes 1.85 yr to circle the Sun.

Apollo Observations: 41
Orbital Period · P
1.85 yr
v(q)
36.2 km/s
v(Q)
16.3 km/s
Diameter · ≈
0.08 km
TJ
4.39
Eccentricity · e
0.38

Orbit and dynamics

The path is an ellipse reaching 0.934 AU from the Sun at perihelion and 2.078 AU at aphelion, a radial span of 1.144 AU.

Applying Kepler's third law to a = 1.506 AU gives an orbital period of 1.85 yr, or about 675 days.

An eccentricity of 0.38 makes the orbit moderately elongated.

The orbital plane is tilted 19.49° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 36.2 km/s at perihelion and falls to 16.3 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 = 23.13 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.08 km.

Observation record and orbit quality

The current orbit solution is based on 41 observations and has a weighted RMS residual of 0.4684 arcseconds.

Condition code U = 4 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
1.506 AU
Eccentricity
0.38
Perihelion
0.934 AU
Aphelion
2.07828 AU
Inclination
19.49°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
289.79°

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
2035-Nov-17 20:48 0.225671 AU
33759848 km
10.47 km/s
2036-Mar-24 19:30 0.279729 AU
41846837 km
11.02 km/s
2048-Nov-05 12:13 0.229143 AU
34279241 km
17.49 km/s
2049-Apr-13 15:42 0.481417 AU
72019015 km
10.76 km/s
2059-Nov-13 22:09 0.353185 AU
52835745 km
9.99 km/s
2060-Mar-23 17:25 0.274749 AU
41101882 km
13.14 km/s
2072-Nov-10 15:54 0.125897 AU
18833915 km
14.44 km/s
2073-Apr-06 11:57 0.400753 AU
59951839 km
10.37 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
23.13

Orbit Quality

RMS
0.46836
Condition
4
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.

Keep exploring

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