SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 UH3

2017 UH3

2017 UH3 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.799 AU it takes 2.41 yr to circle the Sun.

Apollo Observations: 58
Orbital Period · P
2.41 yr
v(q)
47.7 km/s
v(Q)
10.3 km/s
Diameter · ≈
0.12 km
TJ
3.79
Eccentricity · e
0.6444

Orbit and dynamics

Between its closest point (0.64 AU) and its farthest (2.958 AU), the heliocentric distance changes by 2.318 AU over every revolution.

One full revolution takes 2.41 yr (881 days), computed from the semi-major axis of 1.799 AU.

The high eccentricity (0.644) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

Its inclination of 3.39° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 47.7 km/s at perihelion and falls to 10.3 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 = 22.35 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.12 km.

Observation record and orbit quality

Astrometry from 58 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4538 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
1.799 AU
Eccentricity
0.6444
Perihelion
0.64 AU
Aphelion
2.958276 AU
Inclination
3.39°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
234.46°

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-Oct-25 21:08 0.295363 AU
44185649 km
28.00 km/s
2034-Jun-22 17:00 0.360946 AU
53996745 km
17.46 km/s
2046-Jul-23 02:15 0.375778 AU
56215549 km
18.28 km/s
2051-Mar-28 20:54 0.376909 AU
56384775 km
30.42 km/s
2058-Aug-29 05:55 0.301954 AU
45171699 km
14.54 km/s
2063-Apr-11 02:56 0.117461 AU
17571985 km
22.55 km/s
2070-Oct-05 03:15 0.094145 AU
14083945 km
16.47 km/s
2075-Apr-26 11:55 0.120515 AU
18028807 km
15.63 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
22.35

Orbit Quality

RMS
0.45376
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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