SpaceAtlas Space Object Data
NASA JPL SBDB · 877717

877717

877717 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.151 AU it takes 1.23 yr to circle the Sun.

Apollo Observations: 120
Orbital Period · P
1.23 yr
v(q)
37.1 km/s
v(Q)
20.7 km/s
Diameter · ≈
0.14 km
TJ
5.42
Eccentricity · e
0.2838

Orbit and dynamics

Between its closest point (0.825 AU) and its farthest (1.478 AU), the heliocentric distance changes by 0.653 AU over every revolution.

One full revolution takes 1.23 yr (451 days), computed from the semi-major axis of 1.151 AU.

An eccentricity of 0.284 makes the orbit moderately elongated.

Its inclination of 4.54° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 37.1 km/s at perihelion and falls to 20.7 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 = 22.04 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.14 km.

Observation record and orbit quality

Astrometry from 120 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4237 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
1.151 AU
Eccentricity
0.2838
Perihelion
0.825 AU
Aphelion
1.477654 AU
Inclination
4.54°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
51.71°

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
2037-Jul-12 15:48 0.094918 AU
14199528 km
6.75 km/s
2042-Apr-15 18:16 0.178091 AU
26642022 km
7.70 km/s
2047-Feb-07 12:37 0.138554 AU
20727361 km
11.79 km/s
2058-Jul-12 22:35 0.095211 AU
14243398 km
6.74 km/s
2063-Apr-13 19:50 0.176408 AU
26390216 km
7.65 km/s
2068-Feb-06 13:38 0.159165 AU
23810758 km
12.52 km/s
2079-Jun-25 00:21 0.134308 AU
20092224 km
6.53 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
22.04

Orbit Quality

RMS
0.4237
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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