SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 HE

2017 HE

2017 HE belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.181 AU it takes 1.28 yr to circle the Sun.

Apollo Observations: 33
Orbital Period · P
1.28 yr
v(q)
39.2 km/s
v(Q)
19.2 km/s
Diameter · ≈
0.02 km
TJ
5.3
Eccentricity · e
0.3439

Orbit and dynamics

The path is an ellipse reaching 0.775 AU from the Sun at perihelion and 1.587 AU at aphelion, a radial span of 0.812 AU.

Applying Kepler's third law to a = 1.181 AU gives an orbital period of 1.28 yr, or about 469 days.

An eccentricity of 0.344 makes the orbit moderately elongated.

Its inclination of 2.75° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 39.2 km/s at perihelion and falls to 19.2 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 = 26.7 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

The current orbit solution is based on 33 observations and has a weighted RMS residual of 0.6114 arcseconds.

Condition code U = 7 signals a poorly constrained orbit, so its future path should be treated as provisional.

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
1.181 AU
Eccentricity
0.3439
Perihelion
0.775 AU
Aphelion
1.587146 AU
Inclination
2.75°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
95.35°

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-Oct-14 17:10 0.101758 AU
15222805 km
16.98 km/s
2038-Oct-09 10:14 0.225906 AU
33794983 km
20.38 km/s
2047-Oct-03 21:21 0.389589 AU
58281733 km
23.97 km/s
2049-May-06 17:40 0.420301 AU
62876068 km
24.37 km/s
2053-May-21 20:58 0.341604 AU
51103226 km
7.23 km/s
2058-May-01 21:11 0.312633 AU
46769260 km
21.21 km/s
2062-Jun-01 18:29 0.404311 AU
60483990 km
8.10 km/s
2067-Apr-26 14:45 0.139582 AU
20881142 km
17.80 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
26.7

Orbit Quality

RMS
0.61136
Condition
7
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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