SpaceAtlas Space Object Data
NASA JPL SBDB · 877685

877685

877685 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.918 AU and a period of 0.88 yr.

Aten Observations: 82
Orbital Period · P
0.88 yr
v(q)
37.3 km/s
v(Q)
25.9 km/s
Diameter · ≈
0.17 km
TJ
6.45
Eccentricity · e
0.1813

Orbit and dynamics

Between its closest point (0.752 AU) and its farthest (1.085 AU), the heliocentric distance changes by 0.333 AU over every revolution.

One full revolution takes 0.88 yr (321 days), computed from the semi-major axis of 0.918 AU.

An eccentricity of 0.181 makes the orbit moderately elongated.

The orbital plane is tilted 19.2° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 37.3 km/s at perihelion and falls to 25.9 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

The measured diameter is 0.12 km, a value from direct size determination rather than from brightness alone.

A geometric albedo of 0.29 points to a comparatively bright, reflective surface.

Observation record and orbit quality

Astrometry from 82 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4791 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
0.9184 AU
Eccentricity
0.1813
Perihelion
0.752 AU
Aphelion
1.084906 AU
Inclination
19.2°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
139.94°

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
0.124 km
Albedo
0.29
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
21.55

Orbit Quality

RMS
0.4791
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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