SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 HZ4

2017 HZ4

2017 HZ4 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.91 AU and a period of 0.87 yr.

Aten Observations: 56
Orbital Period · P
0.87 yr
v(q)
38.9 km/s
v(Q)
25 km/s
Diameter · ≈
0.02 km
TJ
6.53
Eccentricity · e
0.2167

Orbit and dynamics

The path is an ellipse reaching 0.713 AU from the Sun at perihelion and 1.108 AU at aphelion, a radial span of 0.395 AU.

Applying Kepler's third law to a = 0.91 AU gives an orbital period of 0.87 yr, or about 317 days.

An eccentricity of 0.217 makes the orbit moderately elongated.

Its inclination of 1.79° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 38.9 km/s at perihelion and falls to 25 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 = 25.8 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 56 observations and has a weighted RMS residual of 0.5424 arcseconds.

Condition code U = 5 indicates a moderately constrained orbit; predictions decades ahead still carry noticeable uncertainty.

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
0.9103 AU
Eccentricity
0.2167
Perihelion
0.713 AU
Aphelion
1.107562 AU
Inclination
1.79°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
29.04°

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-Dec-18 10:07 0.199946 AU
29911477 km
5.04 km/s
2030-Apr-08 03:17 0.108744 AU
16267891 km
4.73 km/s
2030-Jul-22 04:53 0.198972 AU
29765856 km
4.30 km/s
2036-Feb-20 22:28 0.317784 AU
47539832 km
15.84 km/s
2036-Oct-27 22:12 0.276412 AU
41350652 km
8.78 km/s
2037-May-31 09:05 0.042821 AU
6405917 km
7.40 km/s
2043-Feb-13 04:34 0.103289 AU
15451795 km
9.09 km/s
2043-Sep-24 11:49 0.283347 AU
42388178 km
8.88 km/s
2044-May-25 03:11 0.262415 AU
39256750 km
14.05 km/s
2050-Mar-09 22:03 0.093102 AU
13927840 km
4.48 km/s
2050-Aug-17 00:08 0.243676 AU
36453440 km
6.63 km/s
2051-May-16 19:01 0.477705 AU
71463588 km
20.58 km/s
2056-Feb-26 17:51 0.442738 AU
66232681 km
19.70 km/s
2056-Nov-15 20:13 0.256550 AU
38379372 km
7.83 km/s
2057-May-24 09:16 0.045514 AU
6808728 km
4.71 km/s
2063-Feb-16 08:48 0.212266 AU
31754497 km
12.49 km/s
2063-Oct-10 18:28 0.285383 AU
42692620 km
9.11 km/s
2064-May-28 04:18 0.160413 AU
23997369 km
10.83 km/s
2070-Feb-12 15:16 0.030520 AU
4565759 km
5.51 km/s
2070-Sep-04 12:24 0.269206 AU
40272571 km
7.98 km/s
2071-May-20 20:10 0.377655 AU
56496417 km
17.51 km/s
2076-Dec-14 22:13 0.204421 AU
30580965 km
5.35 km/s
2077-Apr-09 07:00 0.111818 AU
16727733 km
4.77 km/s
2077-Jul-22 18:48 0.199231 AU
29804509 km
4.37 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
25.8

Orbit Quality

RMS
0.5424
Condition
5
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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