SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 UA8

2017 UA8

2017 UA8 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.434 AU once every 1.72 yr.

Amor Observations: 72
Orbital Period · P
1.72 yr
v(q)
27.9 km/s
v(Q)
22.2 km/s
Diameter · ≈
0.19 km
TJ
4.66
Eccentricity · e
0.1153

Orbit and dynamics

The path is an ellipse reaching 1.268 AU from the Sun at perihelion and 1.599 AU at aphelion, a radial span of 0.331 AU.

Applying Kepler's third law to a = 1.434 AU gives an orbital period of 1.72 yr, or about 627 days.

An eccentricity of 0.115 makes the orbit moderately elongated.

The orbital plane is tilted 7.62° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 27.9 km/s at perihelion and falls to 22.2 km/s at aphelion.

Its perihelion lies just outside Earth's orbit, which is why it is classed as Earth-approaching rather than Earth-crossing.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 21.4 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.19 km.

Observation record and orbit quality

The current orbit solution is based on 72 observations and has a weighted RMS residual of 0.5899 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
1.434 AU
Eccentricity
0.1153
Perihelion
1.268 AU
Aphelion
1.59934 AU
Inclination
7.62°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
45.73°

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-Sep-04 18:41 0.294114 AU
43998789 km
2.48 km/s
2034-May-18 12:41 0.448331 AU
67069346 km
6.17 km/s
2036-Nov-26 05:48 0.454058 AU
67926045 km
6.32 km/s
2041-Aug-19 10:47 0.298743 AU
44691368 km
1.71 km/s
2046-May-10 10:28 0.473189 AU
70788111 km
6.53 km/s
2048-Nov-17 16:45 0.425023 AU
63582549 km
6.01 km/s
2053-Aug-02 06:15 0.308864 AU
46205392 km
1.79 km/s
2058-May-02 19:39 0.496731 AU
74309960 km
6.83 km/s
2060-Nov-08 17:48 0.395563 AU
59175382 km
5.67 km/s
2065-Jul-17 10:35 0.323254 AU
48358092 km
2.64 km/s
2072-Oct-30 00:34 0.366105 AU
54768508 km
5.28 km/s
2077-Jul-03 08:27 0.341713 AU
51119518 km
3.55 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
21.4

Orbit Quality

RMS
0.58995
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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