SpaceAtlas Space Object Data
NASA JPL SBDB · 2008 VR4

2008 VR4

2008 VR4 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.922 AU and a period of 0.88 yr.

Aten Observations: 44
Orbital Period · P
0.88 yr
v(q)
46.7 km/s
v(Q)
20.6 km/s
Diameter · ≈
0.09 km
TJ
6.42
Eccentricity · e
0.388

Orbit and dynamics

The path is an ellipse reaching 0.564 AU from the Sun at perihelion and 1.279 AU at aphelion, a radial span of 0.715 AU.

Applying Kepler's third law to a = 0.922 AU gives an orbital period of 0.88 yr, or about 323 days.

An eccentricity of 0.388 makes the orbit moderately elongated.

Its inclination of 4.17° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 46.7 km/s at perihelion and falls to 20.6 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 = 23.09 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.09 km.

Observation record and orbit quality

The current orbit solution is based on 44 observations and has a weighted RMS residual of 0.597 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
0.9216 AU
Eccentricity
0.388
Perihelion
0.564 AU
Aphelion
1.279181 AU
Inclination
4.17°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
40.01°

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
2031-Oct-31 23:45 0.098811 AU
14781870 km
15.08 km/s
2034-Feb-13 18:00 0.195013 AU
29173462 km
17.68 km/s
2041-Feb-13 17:34 0.160400 AU
23995484 km
8.27 km/s
2046-Oct-31 18:54 0.098534 AU
14740448 km
15.06 km/s
2056-Feb-16 10:03 0.147402 AU
22051018 km
8.46 km/s
2061-Oct-31 00:14 0.079598 AU
11907756 km
14.46 km/s
2071-Feb-12 00:29 0.173893 AU
26014089 km
8.17 km/s
2076-Nov-01 23:53 0.147331 AU
22040390 km
16.58 km/s
2079-Feb-15 02:17 0.173929 AU
26019463 km
16.97 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
23.09

Orbit Quality

RMS
0.59699
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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