SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 HG

2017 HG

2017 HG belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.23 AU it takes 1.36 yr to circle the Sun.

Apollo Observations: 31
Orbital Period · P
1.36 yr
v(q)
42.1 km/s
v(Q)
17.1 km/s
Diameter · ≈
0.02 km
TJ
5.11
Eccentricity · e
0.4209

Orbit and dynamics

The path is an ellipse reaching 0.712 AU from the Sun at perihelion and 1.748 AU at aphelion, a radial span of 1.036 AU.

Applying Kepler's third law to a = 1.23 AU gives an orbital period of 1.36 yr, or about 498 days.

The high eccentricity (0.421) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

Its inclination of 3.86° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 42.1 km/s at perihelion and falls to 17.1 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 = 26.13 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 31 observations and has a weighted RMS residual of 0.3578 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
1.23 AU
Eccentricity
0.4209
Perihelion
0.712 AU
Aphelion
1.747707 AU
Inclination
3.86°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
296.63°

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
2042-Sep-16 08:02 0.461375 AU
69020706 km
8.61 km/s
2043-Jan-16 17:05 0.272206 AU
40721418 km
11.79 km/s
2043-May-17 08:46 0.454654 AU
68015262 km
8.41 km/s
2062-Apr-17 09:06 0.008696 AU
1300901 km
13.87 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
26.13

Orbit Quality

RMS
0.3578
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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