SpaceAtlas Space Object Data
NASA JPL SBDB · 861115

861115

861115 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.554 AU it takes 4.08 yr to circle the Sun.

Apollo Observations: 222
Orbital Period · P
4.08 yr
v(q)
37.5 km/s
v(Q)
9.3 km/s
Diameter · ≈
0.55 km
TJ
2.93
Eccentricity · e
0.6038

Orbit and dynamics

Between its closest point (1.012 AU) and its farthest (4.096 AU), the heliocentric distance changes by 3.084 AU over every revolution.

One full revolution takes 4.08 yr (1,491 days), computed from the semi-major axis of 2.554 AU.

The high eccentricity (0.604) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 36.95° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 37.5 km/s at perihelion and falls to 9.3 km/s at aphelion.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 19.04 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.55 km.

Observation record and orbit quality

Astrometry from 222 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4817 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
2.554 AU
Eccentricity
0.6038
Perihelion
1.012 AU
Aphelion
4.096105 AU
Inclination
36.95°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
15.74°

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

No close approaches to Earth are currently on record for this object.

Physical Parameters

Diameter
— km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
19.04

Orbit Quality

RMS
0.48167
Condition
0
Orbit ID
—
Data source: NASA JPL Small-Body Database . 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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