SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 DL155

2015 DL155

2015 DL155 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.412 AU it takes 1.68 yr to circle the Sun.

Apollo Observations: 19
Orbital Period · P
1.68 yr
v(q)
34 km/s
v(Q)
18.5 km/s
Diameter · ≈
0.05 km
TJ
4.62
Eccentricity · e
0.2945

Orbit and dynamics

Between its closest point (0.996 AU) and its farthest (1.828 AU), the heliocentric distance changes by 0.832 AU over every revolution.

One full revolution takes 1.68 yr (613 days), computed from the semi-major axis of 1.412 AU.

An eccentricity of 0.294 makes the orbit moderately elongated.

A steep inclination of 20.61° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 34 km/s at perihelion and falls to 18.5 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 = 24.35 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.05 km.

Observation record and orbit quality

Astrometry from 19 individual observations underpins this orbit; the fit leaves an RMS residual of 0.6299 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
1.412 AU
Eccentricity
0.2945
Perihelion
0.996 AU
Aphelion
1.827834 AU
Inclination
20.61°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
305.05°

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
2056-Sep-30 10:48 0.407357 AU
60939722 km
17.64 km/s
2061-Oct-02 07:20 0.325624 AU
48712638 km
13.39 km/s
2062-Feb-09 10:16 0.243061 AU
36361468 km
10.67 km/s
2066-Sep-27 08:27 0.320255 AU
47909437 km
11.12 km/s
2067-Feb-06 14:16 0.084618 AU
12658622 km
11.60 km/s
2071-Sep-18 12:47 0.331355 AU
49570045 km
10.66 km/s
2072-Feb-09 09:09 0.110437 AU
16521180 km
14.27 km/s
2076-Sep-07 10:54 0.381668 AU
57096771 km
10.95 km/s
2077-Feb-14 01:19 0.187044 AU
27981369 km
18.41 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
24.35

Orbit Quality

RMS
0.6299
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.

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