SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 HX

2017 HX

2017 HX is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.782 AU and a period of 0.69 yr.

Aten Observations: 55
Orbital Period · P
0.69 yr
v(q)
55.6 km/s
v(Q)
20.4 km/s
Diameter · ≈
0.05 km
TJ
7.33
Eccentricity · e
0.4637

Orbit and dynamics

Between its closest point (0.42 AU) and its farthest (1.145 AU), the heliocentric distance changes by 0.725 AU over every revolution.

One full revolution takes 0.69 yr (253 days), computed from the semi-major axis of 0.782 AU.

The high eccentricity (0.464) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 10.98° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 55.6 km/s at perihelion and falls to 20.4 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 = 24.25 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.05 km.

Observation record and orbit quality

Astrometry from 55 individual observations underpins this orbit; the fit leaves an RMS residual of 0.562 arcseconds.

Condition code U = 2 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
0.7824 AU
Eccentricity
0.4637
Perihelion
0.42 AU
Aphelion
1.145199 AU
Inclination
10.98°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
278.81°

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-Mar-06 12:04 0.138633 AU
20739225 km
13.03 km/s
2035-Apr-24 17:22 0.117334 AU
17552965 km
10.56 km/s
2037-Mar-06 23:00 0.136865 AU
20474741 km
12.86 km/s
2044-Apr-23 23:48 0.117276 AU
17544311 km
10.57 km/s
2046-Mar-07 04:02 0.137380 AU
20551786 km
12.93 km/s
2053-Apr-23 10:37 0.120041 AU
17957889 km
10.54 km/s
2055-Mar-07 06:43 0.139806 AU
20914630 km
13.14 km/s
2062-Apr-22 08:56 0.124267 AU
18590088 km
10.50 km/s
2064-Mar-06 08:04 0.144169 AU
21567439 km
13.45 km/s
2071-Apr-21 00:45 0.128980 AU
19295059 km
10.49 km/s
2073-Mar-06 11:16 0.150190 AU
22468076 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
24.25

Orbit Quality

RMS
0.56196
Condition
2
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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