SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 DF198

2015 DF198

2015 DF198 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.234 AU it takes 1.37 yr to circle the Sun.

Apollo Observations: 15
Orbital Period · P
1.37 yr
v(q)
61.9 km/s
v(Q)
11.6 km/s
Diameter · ≈
0.09 km
TJ
4.92
Eccentricity · e
0.6842

Orbit and dynamics

The path is an ellipse reaching 0.39 AU from the Sun at perihelion and 2.078 AU at aphelion, a radial span of 1.688 AU.

Applying Kepler's third law to a = 1.234 AU gives an orbital period of 1.37 yr, or about 501 days.

The high eccentricity (0.684) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 5.41° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 61.9 km/s at perihelion and falls to 11.6 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 = 23.1 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.09 km.

Observation record and orbit quality

The current orbit solution is based on 15 observations and has a weighted RMS residual of 0.7682 arcseconds.

Condition code U = 8 signals a poorly constrained orbit, so its future path should be treated as provisional.

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
1.234 AU
Eccentricity
0.6842
Perihelion
0.39 AU
Aphelion
2.078303 AU
Inclination
5.41°
Orbital Period
— yr
Epoch
2457077.5
Mean Anomaly
48.34°

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
2046-May-18 05:04 0.252826 AU
37822200 km
36.86 km/s
2050-Jun-15 00:12 0.070161 AU
10495861 km
17.25 km/s
2052-Feb-09 02:32 0.069161 AU
10346331 km
24.68 km/s
2061-Jun-05 15:31 0.016823 AU
2516729 km
24.20 km/s
2063-Jan-29 16:11 0.061319 AU
9173265 km
16.56 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
23.1

Orbit Quality

RMS
0.76825
Condition
8
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.

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