SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 US1

2017 US1

2017 US1 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.267 AU once every 1.43 yr.

Amor Observations: 37
Orbital Period · P
1.43 yr
v(q)
29.4 km/s
v(Q)
23.8 km/s
Diameter · ≈
0.08 km
TJ
5.04
Eccentricity · e
0.1057

Orbit and dynamics

Between its closest point (1.133 AU) and its farthest (1.401 AU), the heliocentric distance changes by 0.268 AU over every revolution.

One full revolution takes 1.43 yr (521 days), computed from the semi-major axis of 1.267 AU.

An eccentricity of 0.106 makes the orbit moderately elongated.

The orbital plane is tilted 17.51° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 29.4 km/s at perihelion and falls to 23.8 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 = 23.3 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.08 km.

Observation record and orbit quality

Astrometry from 37 individual observations underpins this orbit; the fit leaves an RMS residual of 0.624 arcseconds.

Condition code U = 6 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
1.267 AU
Eccentricity
0.1057
Perihelion
1.133 AU
Aphelion
1.400922 AU
Inclination
17.51°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
35.52°

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
2027-Nov-08 11:36 0.202420 AU
30281634 km
9.11 km/s
2031-Mar-28 01:29 0.456181 AU
68243656 km
9.08 km/s
2034-May-31 05:10 0.356401 AU
53316764 km
8.94 km/s
2037-Nov-18 12:57 0.269276 AU
40283178 km
9.19 km/s
2041-Apr-07 08:17 0.427386 AU
63936072 km
9.53 km/s
2044-Jun-12 14:29 0.364969 AU
54598657 km
8.18 km/s
2044-Oct-07 08:36 0.367406 AU
54963093 km
12.32 km/s
2051-Apr-17 17:18 0.401217 AU
60021231 km
9.76 km/s
2054-Oct-17 06:10 0.244790 AU
36620017 km
11.28 km/s
2061-Apr-26 10:44 0.381944 AU
57138045 km
9.82 km/s
2064-Oct-22 12:33 0.190989 AU
28571595 km
10.09 km/s
2074-Oct-28 00:21 0.155947 AU
23329290 km
9.32 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
23.3

Orbit Quality

RMS
0.62395
Condition
6
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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