SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 ST16

2017 ST16

2017 ST16 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.364 AU once every 1.59 yr.

Amor Observations: 25
Orbital Period · P
1.59 yr
v(q)
30.8 km/s
v(Q)
21.1 km/s
Diameter · ≈
0.05 km
TJ
4.79
Eccentricity · e
0.1868

Orbit and dynamics

Between its closest point (1.109 AU) and its farthest (1.619 AU), the heliocentric distance changes by 0.51 AU over every revolution.

One full revolution takes 1.59 yr (582 days), computed from the semi-major axis of 1.364 AU.

An eccentricity of 0.187 makes the orbit moderately elongated.

The orbital plane is tilted 14.44° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 30.8 km/s at perihelion and falls to 21.1 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 = 24.2 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.05 km.

Observation record and orbit quality

Astrometry from 25 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4996 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
1.364 AU
Eccentricity
0.1868
Perihelion
1.109 AU
Aphelion
1.618795 AU
Inclination
14.44°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
148.19°

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
2033-Oct-12 02:19 0.416083 AU
62245117 km
12.72 km/s
2034-Jan-12 23:23 0.412061 AU
61643395 km
4.91 km/s
2042-Feb-05 04:41 0.456843 AU
68342793 km
7.58 km/s
2052-Sep-15 00:07 0.271504 AU
40616464 km
7.94 km/s
2060-Sep-28 20:37 0.118386 AU
17710324 km
7.60 km/s
2068-Oct-04 00:09 0.101534 AU
15189241 km
8.03 km/s
2076-Oct-07 05:10 0.193788 AU
28990323 km
10.26 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
24.2

Orbit Quality

RMS
0.49959
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

Explore asteroids, comets and near-Earth objects with JPL orbital data.