SpaceAtlas Space Object Data
NASA JPL SBDB · 2019 UL8

2019 UL8

2019 UL8 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.495 AU it takes 1.83 yr to circle the Sun.

Apollo Observations: 58
Orbital Period · P
1.83 yr
v(q)
41.3 km/s
v(Q)
14.4 km/s
Diameter · ≈
0.02 km
TJ
4.42
Eccentricity · e
0.4845

Orbit and dynamics

The path is an ellipse reaching 0.771 AU from the Sun at perihelion and 2.219 AU at aphelion, a radial span of 1.448 AU.

Applying Kepler's third law to a = 1.495 AU gives an orbital period of 1.83 yr, or about 668 days.

The high eccentricity (0.484) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

Its inclination of 0.79° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 41.3 km/s at perihelion and falls to 14.4 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 = 26.34 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 58 observations and has a weighted RMS residual of 0.3432 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
1.495 AU
Eccentricity
0.4845
Perihelion
0.771 AU
Aphelion
2.219327 AU
Inclination
0.79°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
192.82°

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-Apr-02 00:22 0.091604 AU
13703830 km
15.35 km/s
2030-Oct-22 04:53 0.204133 AU
30537905 km
18.77 km/s
2040-Mar-17 11:19 0.075473 AU
11290569 km
10.26 km/s
2041-Oct-12 09:41 0.388595 AU
58132978 km
24.29 km/s
2050-Oct-16 03:20 0.488975 AU
73149582 km
5.93 km/s
2051-Jan-28 14:40 0.206570 AU
30902432 km
10.81 km/s
2061-Dec-18 07:50 0.188834 AU
28249157 km
10.18 km/s
2071-Apr-15 23:48 0.329737 AU
49327978 km
22.35 km/s
2072-Nov-06 00:37 0.019480 AU
2914229 km
11.97 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
26.34

Orbit Quality

RMS
0.34325
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

Explore asteroids, comets and near-Earth objects with JPL orbital data.