SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 HU3

2018 HU3

2018 HU3 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.157 AU it takes 1.24 yr to circle the Sun.

Apollo Observations: 20
Orbital Period · P
1.24 yr
v(q)
32.9 km/s
v(Q)
23.3 km/s
Diameter · ≈
0.01 km
TJ
5.42
Eccentricity · e
0.1714

Orbit and dynamics

Between its closest point (0.959 AU) and its farthest (1.355 AU), the heliocentric distance changes by 0.396 AU over every revolution.

One full revolution takes 1.24 yr (455 days), computed from the semi-major axis of 1.157 AU.

An eccentricity of 0.171 makes the orbit moderately elongated.

The orbital plane is tilted 5.48° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 32.9 km/s at perihelion and falls to 23.3 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 = 28.12 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

Astrometry from 20 individual observations underpins this orbit; the fit leaves an RMS residual of 0.7317 arcseconds.

Condition code U = 6 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
1.157 AU
Eccentricity
0.1714
Perihelion
0.959 AU
Aphelion
1.35531 AU
Inclination
5.48°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
151.64°

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-Apr-08 17:19 0.184604 AU
27616432 km
10.84 km/s
2028-Oct-29 21:11 0.301518 AU
45106484 km
6.13 km/s
2033-Apr-01 21:21 0.329883 AU
49349733 km
15.07 km/s
2033-Nov-15 16:55 0.341604 AU
51103161 km
6.76 km/s
2038-Mar-26 06:40 0.477060 AU
71367222 km
19.43 km/s
2038-Dec-01 02:07 0.367862 AU
55031426 km
7.09 km/s
2043-Dec-15 21:18 0.380381 AU
56904125 km
7.13 km/s
2048-Dec-29 20:21 0.375250 AU
56136624 km
6.94 km/s
2049-Sep-09 15:24 0.475927 AU
71197718 km
18.96 km/s
2054-Jan-14 13:04 0.354954 AU
53100396 km
6.47 km/s
2054-Sep-03 08:58 0.335077 AU
50126774 km
14.74 km/s
2059-Feb-01 02:35 0.318867 AU
47701774 km
5.67 km/s
2059-Aug-28 06:35 0.203465 AU
30437878 km
10.63 km/s
2064-Feb-21 12:34 0.266691 AU
39896379 km
4.54 km/s
2064-Aug-20 17:11 0.107718 AU
16114447 km
6.90 km/s
2069-Aug-06 18:55 0.094516 AU
14139452 km
3.87 km/s
2074-Jun-06 10:02 0.084400 AU
12626129 km
4.14 km/s
2079-May-04 15:53 0.031984 AU
4784796 km
4.40 km/s
2079-Sep-20 04:51 0.190933 AU
28563213 km
3.86 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
28.12

Orbit Quality

RMS
0.73173
Condition
6
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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