SpaceAtlas Space Object Data
NASA JPL SBDB · 2009 WR25

2009 WR25

2009 WR25 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.868 AU and a period of 0.81 yr.

Aten Observations: 85
Orbital Period · P
0.81 yr
v(q)
54 km/s
v(Q)
18.9 km/s
Diameter · ≈
0.17 km
TJ
6.61
Eccentricity · e
0.481

Orbit and dynamics

Between its closest point (0.45 AU) and its farthest (1.285 AU), the heliocentric distance changes by 0.835 AU over every revolution.

One full revolution takes 0.81 yr (295 days), computed from the semi-major axis of 0.868 AU.

The high eccentricity (0.481) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 31.72° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 54 km/s at perihelion and falls to 18.9 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

No direct size measurement is available; from an absolute magnitude of H = 21.58 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.17 km.

Observation record and orbit quality

Astrometry from 85 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4804 arcseconds.

Condition code U = 1 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
0.8675 AU
Eccentricity
0.481
Perihelion
0.45 AU
Aphelion
1.284768 AU
Inclination
31.72°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
279.44°

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
2026-Nov-18 12:19 0.225005 AU
33660326 km
17.18 km/s
2030-Nov-14 04:57 0.105223 AU
15741116 km
19.37 km/s
2034-Nov-17 00:34 0.218925 AU
32750748 km
24.17 km/s
2036-Mar-27 04:59 0.499222 AU
74682598 km
23.36 km/s
2038-Nov-23 21:24 0.421053 AU
62988599 km
30.41 km/s
2039-Dec-10 09:56 0.443082 AU
66284134 km
16.82 km/s
2043-Nov-27 10:45 0.340916 AU
51000284 km
16.86 km/s
2047-Nov-17 18:24 0.203342 AU
30419585 km
17.35 km/s
2051-Nov-14 13:36 0.104481 AU
15630089 km
19.93 km/s
2055-Nov-18 04:41 0.246483 AU
36873270 km
25.01 km/s
2057-Mar-31 03:27 0.498018 AU
74502477 km
23.91 km/s
2059-Nov-25 09:43 0.450733 AU
67428641 km
31.36 km/s
2060-Dec-07 17:15 0.431121 AU
64494854 km
16.82 km/s
2064-Nov-25 02:34 0.323173 AU
48346058 km
16.85 km/s
2068-Nov-16 03:24 0.181643 AU
27173451 km
17.54 km/s
2072-Nov-14 02:15 0.112146 AU
16776852 km
20.57 km/s
2076-Nov-18 11:36 0.276359 AU
41342781 km
25.91 km/s
2077-Dec-21 03:20 0.492671 AU
73702553 km
16.57 km/s
2078-Apr-04 04:04 0.497368 AU
74405197 km
24.48 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
21.58

Orbit Quality

RMS
0.48038
Condition
1
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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