SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 AR4

2017 AR4

2017 AR4 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.024 AU it takes 1.04 yr to circle the Sun.

Apollo Observations: 67
Orbital Period · P
1.04 yr
v(q)
32.2 km/s
v(Q)
26.9 km/s
Diameter · ≈
0.04 km
TJ
5.96
Eccentricity · e
0.0906

Orbit and dynamics

Between its closest point (0.932 AU) and its farthest (1.117 AU), the heliocentric distance changes by 0.185 AU over every revolution.

One full revolution takes 1.04 yr (378 days), computed from the semi-major axis of 1.024 AU.

With e = 0.091, the orbit is close to circular.

The orbital plane is tilted 7.7° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 32.2 km/s at perihelion and falls to 26.9 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 = 24.8 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.04 km.

Observation record and orbit quality

Astrometry from 67 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5472 arcseconds.

Condition code U = 4 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
1.024 AU
Eccentricity
0.0906
Perihelion
0.932 AU
Aphelion
1.116774 AU
Inclination
7.7°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
140.76°

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-Jun-01 07:29 0.288040 AU
43090137 km
11.78 km/s
2043-Jun-18 21:02 0.074990 AU
11218280 km
6.07 km/s
2044-Mar-26 14:15 0.179762 AU
26891967 km
3.07 km/s
2044-Aug-11 19:05 0.120054 AU
17959755 km
4.35 km/s
2045-Jan-12 16:02 0.108358 AU
16210186 km
4.55 km/s
2045-Dec-12 07:46 0.111415 AU
16667450 km
6.62 km/s
2046-Dec-13 15:42 0.319461 AU
47790704 km
12.72 km/s
2070-May-23 22:14 0.438945 AU
65665233 km
16.16 km/s
2071-Jun-05 15:11 0.222020 AU
33213737 km
9.98 km/s
2072-Jun-26 11:28 0.036352 AU
5438117 km
5.01 km/s
2073-Feb-26 03:17 0.171992 AU
25729658 km
4.04 km/s
2073-Sep-20 05:32 0.144523 AU
21620293 km
3.22 km/s
2073-Dec-30 21:11 0.075968 AU
11364578 km
4.57 km/s
2074-Dec-11 15:41 0.151735 AU
22699230 km
7.90 km/s
2075-Dec-15 02:52 0.357751 AU
53518714 km
14.06 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
24.8

Orbit Quality

RMS
0.54716
Condition
4
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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