SpaceAtlas Space Object Data
NASA JPL SBDB · 2012 UK171

2012 UK171

2012 UK171 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.859 AU and a period of 0.80 yr.

Aten Observations: 286
Orbital Period · P
0.80 yr
v(q)
40.3 km/s
v(Q)
25.6 km/s
Diameter · ≈
0.05 km
TJ
6.85
Eccentricity · e
0.223

Orbit and dynamics

Between its closest point (0.667 AU) and its farthest (1.05 AU), the heliocentric distance changes by 0.383 AU over every revolution.

One full revolution takes 0.80 yr (291 days), computed from the semi-major axis of 0.859 AU.

An eccentricity of 0.223 makes the orbit moderately elongated.

Its inclination of 1.29° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 40.3 km/s at perihelion and falls to 25.6 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 = 24.46 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.05 km.

Observation record and orbit quality

Astrometry from 286 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4268 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
0.8587 AU
Eccentricity
0.223
Perihelion
0.667 AU
Aphelion
1.05019 AU
Inclination
1.29°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
159.67°

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
2029-Jan-11 03:35 0.152850 AU
22866078 km
10.55 km/s
2047-Oct-23 18:24 0.053425 AU
7992326 km
7.29 km/s
2051-Nov-09 12:05 0.046503 AU
6956747 km
4.65 km/s
2055-Dec-26 19:58 0.047192 AU
7059778 km
4.64 km/s
2060-Jan-12 07:30 0.044684 AU
6684604 km
6.95 km/s
2064-Jan-10 12:42 0.190919 AU
28561104 km
11.75 km/s
2078-Oct-23 16:40 0.131479 AU
19669001 km
9.81 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
24.46

Orbit Quality

RMS
0.42676
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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