SpaceAtlas Space Object Data
NASA JPL SBDB · 887771

887771

887771 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.079 AU it takes 1.12 yr to circle the Sun.

Apollo Observations: 160
Orbital Period · P
1.12 yr
v(q)
51.3 km/s
v(Q)
16 km/s
Diameter · ≈
0.3 km
TJ
5.43
Eccentricity · e
0.5245

Orbit and dynamics

Between its closest point (0.513 AU) and its farthest (1.645 AU), the heliocentric distance changes by 1.132 AU over every revolution.

One full revolution takes 1.12 yr (409 days), computed from the semi-major axis of 1.079 AU.

The high eccentricity (0.524) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 38.7° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 51.3 km/s at perihelion and falls to 16 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 = 20.38 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.3 km.

Observation record and orbit quality

Astrometry from 160 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4089 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
1.079 AU
Eccentricity
0.5245
Perihelion
0.513 AU
Aphelion
1.644935 AU
Inclination
38.7°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
356.2°

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
2053-Feb-25 23:09 0.167938 AU
25123189 km
22.98 km/s
2062-Feb-22 23:30 0.193297 AU
28916816 km
26.42 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
20.38

Orbit Quality

RMS
0.4089
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

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