SpaceAtlas Space Object Data
NASA JPL SBDB · 2008 PW4

2008 PW4

2008 PW4 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.162 AU it takes 1.25 yr to circle the Sun.

Apollo Observations: 77
Orbital Period · P
1.25 yr
v(q)
36.6 km/s
v(Q)
20.9 km/s
Diameter · ≈
0.12 km
TJ
5.39
Eccentricity · e
0.273

Orbit and dynamics

Between its closest point (0.845 AU) and its farthest (1.479 AU), the heliocentric distance changes by 0.634 AU over every revolution.

One full revolution takes 1.25 yr (458 days), computed from the semi-major axis of 1.162 AU.

An eccentricity of 0.273 makes the orbit moderately elongated.

Its inclination of 2.68° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 36.6 km/s at perihelion and falls to 20.9 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 = 22.42 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.12 km.

Observation record and orbit quality

Astrometry from 77 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3428 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
1.162 AU
Eccentricity
0.273
Perihelion
0.845 AU
Aphelion
1.479226 AU
Inclination
2.68°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
23.74°

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-Aug-11 21:44 0.225755 AU
33772515 km
3.28 km/s
2028-Oct-27 06:54 0.146769 AU
21956258 km
6.31 km/s
2029-Mar-05 21:00 0.300440 AU
44945198 km
5.57 km/s
2033-Jul-22 11:21 0.282276 AU
42227927 km
5.13 km/s
2033-Nov-18 06:07 0.148491 AU
22213956 km
6.46 km/s
2034-Feb-19 08:51 0.249147 AU
37271882 km
4.28 km/s
2038-Jul-11 22:54 0.322638 AU
48266000 km
5.97 km/s
2038-Dec-09 07:39 0.131554 AU
19680178 km
6.02 km/s
2043-Jul-04 10:50 0.352129 AU
52677816 km
6.56 km/s
2043-Dec-31 15:48 0.097301 AU
14555968 km
5.34 km/s
2048-Jun-28 11:23 0.370900 AU
55485844 km
6.88 km/s
2049-Jan-14 00:34 0.058045 AU
8683360 km
5.83 km/s
2053-Jun-27 09:46 0.373447 AU
55866804 km
6.94 km/s
2054-Jan-15 15:31 0.051981 AU
7776195 km
5.98 km/s
2058-Jul-01 04:59 0.359056 AU
53713946 km
6.69 km/s
2059-Jan-05 18:24 0.086274 AU
12906423 km
5.33 km/s
2063-Jul-06 13:36 0.339073 AU
50724541 km
6.32 km/s
2063-Dec-19 19:53 0.118384 AU
17710030 km
5.64 km/s
2068-Jul-12 23:21 0.311329 AU
46574218 km
5.77 km/s
2068-Dec-01 04:19 0.140980 AU
21090315 km
6.25 km/s
2073-Jul-23 02:34 0.274662 AU
41088836 km
4.98 km/s
2073-Nov-13 17:27 0.151515 AU
22666306 km
6.54 km/s
2074-Feb-23 16:57 0.261356 AU
39098330 km
4.70 km/s
2078-Aug-08 09:38 0.227642 AU
34054755 km
3.60 km/s
2078-Oct-26 22:43 0.148721 AU
22248356 km
6.34 km/s
2079-Mar-07 03:17 0.302116 AU
45195938 km
5.67 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
22.42

Orbit Quality

RMS
0.34281
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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