SpaceAtlas Space Object Data
NASA JPL SBDB · 2008 UU1

2008 UU1

2008 UU1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.608 AU it takes 2.04 yr to circle the Sun.

Apollo Observations: 31
Orbital Period · P
2.04 yr
v(q)
62.1 km/s
v(Q)
8.9 km/s
Diameter · ≈
0.37 km
TJ
3.96
Eccentricity · e
0.7502

Orbit and dynamics

Between its closest point (0.402 AU) and its farthest (2.814 AU), the heliocentric distance changes by 2.412 AU over every revolution.

One full revolution takes 2.04 yr (745 days), computed from the semi-major axis of 1.608 AU.

The high eccentricity (0.75) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 12.11° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 62.1 km/s at perihelion and falls to 8.9 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 = 19.9 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.37 km.

Observation record and orbit quality

Astrometry from 31 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5425 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
1.608 AU
Eccentricity
0.7502
Perihelion
0.402 AU
Aphelion
2.814322 AU
Inclination
12.11°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
257.55°

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
2039-Feb-19 07:11 0.293275 AU
43873381 km
34.99 km/s
2041-Mar-01 07:11 0.061958 AU
9268750 km
27.77 km/s
2043-Mar-11 20:46 0.178749 AU
26740446 km
20.96 km/s
2045-Mar-22 01:18 0.419328 AU
62730554 km
14.27 km/s
2059-Sep-29 09:22 0.350218 AU
52391869 km
17.36 km/s
2061-Oct-16 06:46 0.182977 AU
27372944 km
23.67 km/s
2063-Oct-28 04:01 0.220704 AU
33016812 km
30.38 km/s
2065-Nov-07 07:20 0.399095 AU
59703828 km
37.17 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
19.9

Orbit Quality

RMS
0.54254
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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