SpaceAtlas Space Object Data
NASA JPL SBDB · 85953

85953

85953 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.739 AU and a period of 0.64 yr.

Aten Observations: 2,132
Orbital Period · P
0.64 yr
v(q)
83.1 km/s
v(Q)
14.5 km/s
Diameter · ≈
0.86 km
TJ
7.57
Eccentricity · e
0.7031

Orbit and dynamics

The path is an ellipse reaching 0.219 AU from the Sun at perihelion and 1.258 AU at aphelion, a radial span of 1.039 AU.

Applying Kepler's third law to a = 0.739 AU gives an orbital period of 0.64 yr, or about 232 days.

The high eccentricity (0.703) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 12.6° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 83.1 km/s at perihelion and falls to 14.5 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 0.59 km, a value from direct size determination rather than from brightness alone.

A geometric albedo of 0.32 points to a comparatively bright, reflective surface.

Observation record and orbit quality

The current orbit solution is based on 2,132 observations and has a weighted RMS residual of 0.389 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
0.7389 AU
Eccentricity
0.7031
Perihelion
0.219 AU
Aphelion
1.258421 AU
Inclination
12.6°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
209.34°

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
2028-Feb-16 12:19 0.124015 AU
18552337 km
19.43 km/s
2032-Apr-07 22:55 0.075502 AU
11295001 km
20.84 km/s
2035-Feb-17 10:56 0.143872 AU
21522886 km
17.81 km/s
2039-Apr-07 08:52 0.125147 AU
18721701 km
23.25 km/s
2042-Feb-20 16:24 0.183170 AU
27401795 km
16.72 km/s
2046-Apr-04 19:45 0.197612 AU
29562362 km
25.99 km/s
2051-Apr-01 21:11 0.192714 AU
28829575 km
16.41 km/s
2058-Apr-06 00:17 0.143445 AU
21459049 km
17.10 km/s
2061-Feb-16 22:55 0.151007 AU
22590378 km
22.39 km/s
2065-Apr-08 03:33 0.094122 AU
14080521 km
18.44 km/s
2068-Feb-16 18:11 0.123913 AU
18537167 km
20.14 km/s
2072-Apr-08 09:03 0.071879 AU
10752969 km
20.12 km/s
2075-Feb-17 01:31 0.132866 AU
19876530 km
18.35 km/s
2079-Apr-08 05:49 0.103633 AU
15503256 km
22.33 km/s

Distances in astronomical units (AU) and kilometres. Source: NASA/JPL CNEOS Close Approach Data API.

Physical Parameters

Diameter
0.59 km
Albedo
0.32
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
18.09

Orbit Quality

RMS
0.38904
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.

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