SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 SX11

2017 SX11

2017 SX11 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.445 AU it takes 1.74 yr to circle the Sun.

Apollo Observations: 85
Orbital Period · P
1.74 yr
v(q)
43.3 km/s
v(Q)
14.2 km/s
Diameter · ≈
0.22 km
TJ
4.49
Eccentricity · e
0.5062

Orbit and dynamics

The path is an ellipse reaching 0.714 AU from the Sun at perihelion and 2.176 AU at aphelion, a radial span of 1.462 AU.

Applying Kepler's third law to a = 1.445 AU gives an orbital period of 1.74 yr, or about 634 days.

The high eccentricity (0.506) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 11° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 43.3 km/s at perihelion and falls to 14.2 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 = 21.04 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.22 km.

Observation record and orbit quality

The current orbit solution is based on 85 observations and has a weighted RMS residual of 0.5154 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
1.445 AU
Eccentricity
0.5062
Perihelion
0.714 AU
Aphelion
2.176459 AU
Inclination
11.0°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
298.82°

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
2030-May-05 07:28 0.370240 AU
55387066 km
23.99 km/s
2031-Oct-22 09:38 0.363990 AU
54452156 km
23.51 km/s
2037-Apr-15 14:26 0.159667 AU
23885914 km
15.57 km/s
2044-Mar-05 17:47 0.228874 AU
34239100 km
13.18 km/s
2051-Jan-25 07:51 0.280187 AU
41915355 km
14.47 km/s
2057-Dec-02 02:13 0.233314 AU
34903345 km
10.68 km/s
2064-Oct-30 01:17 0.243268 AU
36392424 km
18.85 km/s
2070-Apr-26 10:47 0.238902 AU
35739234 km
19.44 km/s
2077-Mar-26 17:41 0.181896 AU
27211277 km
12.58 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
21.04

Orbit Quality

RMS
0.51539
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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