SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 KZ4

2017 KZ4

2017 KZ4 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.537 AU it takes 1.91 yr to circle the Sun.

Apollo Observations: 81
Orbital Period · P
1.91 yr
v(q)
71.5 km/s
v(Q)
8.1 km/s
Diameter · ≈
0.26 km
TJ
3.98
Eccentricity · e
0.7969

Orbit and dynamics

Between its closest point (0.312 AU) and its farthest (2.762 AU), the heliocentric distance changes by 2.45 AU over every revolution.

One full revolution takes 1.91 yr (696 days), computed from the semi-major axis of 1.537 AU.

The high eccentricity (0.797) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 25.23° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 71.5 km/s at perihelion and falls to 8.1 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 = 20.71 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.26 km.

Observation record and orbit quality

Astrometry from 81 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4785 arcseconds.

Condition code U = 1 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
1.537 AU
Eccentricity
0.7969
Perihelion
0.312 AU
Aphelion
2.761835 AU
Inclination
25.23°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
313.13°

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
2034-May-28 17:06 0.465876 AU
69694066 km
42.91 km/s
2036-May-03 21:52 0.089071 AU
13324896 km
26.88 km/s
2043-Sep-27 22:44 0.434417 AU
64987831 km
25.14 km/s
2055-May-15 03:25 0.172693 AU
25834485 km
33.84 km/s
2057-Apr-25 09:02 0.394070 AU
58951992 km
19.58 km/s
2064-Sep-04 04:49 0.404840 AU
60563179 km
31.49 km/s
2074-May-27 00:41 0.426320 AU
63776580 km
41.70 km/s
2076-May-02 10:54 0.127061 AU
19007991 km
25.75 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
20.71

Orbit Quality

RMS
0.47849
Condition
1
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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