SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 EH17

2011 EH17

2011 EH17 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.731 AU and a period of 0.62 yr.

Aten Observations: 71
Orbital Period · P
0.62 yr
v(q)
77.1 km/s
v(Q)
15.8 km/s
Diameter · ≈
0.04 km
TJ
7.68
Eccentricity · e
0.6599

Orbit and dynamics

Between its closest point (0.248 AU) and its farthest (1.213 AU), the heliocentric distance changes by 0.965 AU over every revolution.

One full revolution takes 0.62 yr (228 days), computed from the semi-major axis of 0.731 AU.

The high eccentricity (0.66) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

Its inclination of 2.99° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 77.1 km/s at perihelion and falls to 15.8 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 = 24.82 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.04 km.

Observation record and orbit quality

Astrometry from 71 individual observations underpins this orbit; the fit leaves an RMS residual of 0.6148 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
0.7307 AU
Eccentricity
0.6599
Perihelion
0.248 AU
Aphelion
1.212889 AU
Inclination
2.99°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
251.4°

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
2028-Apr-23 09:44 0.099855 AU
14938034 km
15.37 km/s
2031-Mar-03 02:39 0.053596 AU
8017806 km
16.12 km/s
2033-Apr-24 03:29 0.091936 AU
13753392 km
15.57 km/s
2036-Mar-02 14:52 0.061797 AU
9244772 km
15.93 km/s
2038-Apr-24 17:43 0.085623 AU
12808975 km
15.74 km/s
2041-Mar-03 08:08 0.073080 AU
10932654 km
15.65 km/s
2043-Apr-25 12:47 0.072589 AU
10859228 km
16.12 km/s
2046-Mar-04 19:16 0.095899 AU
14346360 km
15.15 km/s
2048-Apr-25 09:37 0.054385 AU
8135919 km
16.84 km/s
2051-Mar-06 17:02 0.118136 AU
17672936 km
14.75 km/s
2053-Apr-25 21:26 0.046275 AU
6922695 km
17.61 km/s
2056-Mar-08 05:06 0.140257 AU
20982203 km
14.44 km/s
2058-Apr-26 01:28 0.055620 AU
8320629 km
18.64 km/s
2061-Mar-11 17:35 0.164079 AU
24545813 km
14.21 km/s
2063-Apr-25 18:40 0.085851 AU
12843124 km
19.97 km/s
2066-Mar-15 22:09 0.185262 AU
27714768 km
14.11 km/s
2068-Apr-24 01:12 0.126745 AU
18960849 km
21.48 km/s
2073-Apr-22 20:32 0.175937 AU
26319840 km
23.22 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
24.82

Orbit Quality

RMS
0.6148
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.

Keep exploring

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