SpaceAtlas Space Object Data
NASA JPL SBDB · 361861

361861

361861 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.908 AU it takes 4.96 yr to circle the Sun.

Apollo Observations: 141
Orbital Period · P
4.96 yr
v(q)
45.2 km/s
v(Q)
6.8 km/s
Diameter · ≈
1.43 km
TJ
2.6
Eccentricity · e
0.7401

Orbit and dynamics

Between its closest point (0.756 AU) and its farthest (5.06 AU), the heliocentric distance changes by 4.304 AU over every revolution.

One full revolution takes 4.96 yr (1,811 days), computed from the semi-major axis of 2.908 AU.

The high eccentricity (0.74) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 36.42° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 45.2 km/s at perihelion and falls to 6.8 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 = 16.98 and an assumed geometric albedo of 0.14, the diameter works out to roughly 1.43 km.

Observation record and orbit quality

Astrometry from 141 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4753 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
2.908 AU
Eccentricity
0.7401
Perihelion
0.756 AU
Aphelion
5.060211 AU
Inclination
36.42°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
224.03°

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
2067-Aug-14 10:08 0.307176 AU
45952843 km
29.31 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
16.98

Orbit Quality

RMS
0.47528
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

Explore asteroids, comets and near-Earth objects with JPL orbital data.