SpaceAtlas Space Object Data
NASA JPL SBDB · 2019 YA4

2019 YA4

2019 YA4 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.923 AU and a period of 0.89 yr.

Aten Observations: 165
Orbital Period · P
0.89 yr
v(q)
51.6 km/s
v(Q)
18.6 km/s
Diameter · ≈
0.07 km
TJ
6.38
Eccentricity · e
0.4704

Orbit and dynamics

The path is an ellipse reaching 0.489 AU from the Sun at perihelion and 1.357 AU at aphelion, a radial span of 0.868 AU.

Applying Kepler's third law to a = 0.923 AU gives an orbital period of 0.89 yr, or about 324 days.

The high eccentricity (0.47) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

Its inclination of 2.82° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 51.6 km/s at perihelion and falls to 18.6 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 = 23.4 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.07 km.

Observation record and orbit quality

The current orbit solution is based on 165 observations and has a weighted RMS residual of 0.5166 arcseconds.

Condition code U = 0 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
0.923 AU
Eccentricity
0.4704
Perihelion
0.489 AU
Aphelion
1.357179 AU
Inclination
2.82°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
174.18°

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
2027-Dec-24 14:32 0.123701 AU
18505345 km
11.12 km/s
2030-Apr-07 16:35 0.090585 AU
13551267 km
16.76 km/s
2050-Dec-27 06:14 0.123951 AU
18542787 km
18.22 km/s
2053-Apr-07 07:22 0.160565 AU
24020206 km
10.49 km/s
2058-Dec-23 09:33 0.042860 AU
6411750 km
13.37 km/s
2061-Apr-09 06:30 0.049428 AU
7394380 km
14.69 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
23.4

Orbit Quality

RMS
0.51663
Condition
0
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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