SpaceAtlas Space Object Data
NASA JPL SBDB · 2019 SD

2019 SD

2019 SD belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.258 AU it takes 3.39 yr to circle the Sun.

Apollo Observations: 142
Orbital Period · P
3.39 yr
v(q)
37.8 km/s
v(Q)
10.4 km/s
Diameter · ≈
0.03 km
TJ
3.38
Eccentricity · e
0.5688

Orbit and dynamics

Between its closest point (0.974 AU) and its farthest (3.542 AU), the heliocentric distance changes by 2.568 AU over every revolution.

One full revolution takes 3.39 yr (1,239 days), computed from the semi-major axis of 2.258 AU.

The high eccentricity (0.569) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 5.2° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 37.8 km/s at perihelion and falls to 10.4 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 = 25.4 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.03 km.

Observation record and orbit quality

Astrometry from 142 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4697 arcseconds.

Condition code U = 5 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
2.258 AU
Eccentricity
0.5688
Perihelion
0.974 AU
Aphelion
3.54235 AU
Inclination
5.2°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
0.02°

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
2036-Aug-29 23:34 0.019993 AU
2990967 km
8.84 km/s
2053-Jul-02 04:37 0.123578 AU
18487008 km
13.61 km/s
2070-Jun-09 08:43 0.367808 AU
55023339 km
23.57 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
25.4

Orbit Quality

RMS
0.4697
Condition
5
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.