SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 HX3

2017 HX3

2017 HX3 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.223 AU it takes 1.35 yr to circle the Sun.

Apollo Observations: 94
Orbital Period · P
1.35 yr
v(q)
39.4 km/s
v(Q)
18.4 km/s
Diameter · ≈
0.15 km
TJ
5.14
Eccentricity · e
0.3624

Orbit and dynamics

Between its closest point (0.779 AU) and its farthest (1.666 AU), the heliocentric distance changes by 0.887 AU over every revolution.

One full revolution takes 1.35 yr (494 days), computed from the semi-major axis of 1.223 AU.

An eccentricity of 0.362 makes the orbit moderately elongated.

The orbital plane is tilted 12.32° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 39.4 km/s at perihelion and falls to 18.4 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 = 21.86 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.15 km.

Observation record and orbit quality

Astrometry from 94 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5836 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
1.223 AU
Eccentricity
0.3624
Perihelion
0.779 AU
Aphelion
1.666215 AU
Inclination
12.32°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
187.54°

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
2040-Jun-07 14:22 0.107991 AU
16155181 km
9.88 km/s
2048-Nov-14 19:31 0.099397 AU
14869606 km
10.30 km/s
2063-May-26 16:16 0.114967 AU
17198770 km
15.43 km/s
2067-Jun-20 09:33 0.193821 AU
28995215 km
8.22 km/s
2075-Nov-18 01:34 0.058022 AU
8679943 km
11.59 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
21.86

Orbit Quality

RMS
0.58362
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

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