SpaceAtlas Space Object Data
NASA JPL SBDB · 2003 WJ98

2003 WJ98

2003 WJ98 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.262 AU it takes 1.42 yr to circle the Sun.

Apollo Observations: 45
Orbital Period · P
1.42 yr
v(q)
32.6 km/s
v(Q)
21.5 km/s
Diameter · ≈
0.09 km
TJ
5.01
Eccentricity · e
0.2056

Orbit and dynamics

Between its closest point (1.003 AU) and its farthest (1.521 AU), the heliocentric distance changes by 0.518 AU over every revolution.

One full revolution takes 1.42 yr (518 days), computed from the semi-major axis of 1.262 AU.

An eccentricity of 0.206 makes the orbit moderately elongated.

A steep inclination of 22.86° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 32.6 km/s at perihelion and falls to 21.5 km/s at aphelion.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 23.05 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.09 km.

Observation record and orbit quality

Astrometry from 45 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5884 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
1.262 AU
Eccentricity
0.2056
Perihelion
1.003 AU
Aphelion
1.521467 AU
Inclination
22.86°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
295.9°

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
2030-Nov-17 06:23 0.366033 AU
54757734 km
18.17 km/s
2031-May-06 01:45 0.394370 AU
58996851 km
11.78 km/s
2037-Dec-06 17:40 0.208643 AU
31212523 km
12.67 km/s
2041-May-28 21:05 0.465965 AU
69707377 km
12.38 km/s
2047-Nov-21 14:27 0.265302 AU
39688686 km
16.12 km/s
2048-Apr-29 18:03 0.391039 AU
58498618 km
11.59 km/s
2054-Dec-09 19:29 0.316226 AU
47306700 km
13.66 km/s
2058-May-24 00:47 0.444252 AU
66459137 km
12.31 km/s
2064-Nov-25 00:12 0.158417 AU
23698896 km
14.30 km/s
2065-Apr-23 10:04 0.394799 AU
59061109 km
11.35 km/s
2071-Dec-11 22:09 0.416998 AU
62382037 km
14.99 km/s
2075-May-19 17:49 0.426229 AU
63763013 km
12.20 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
23.05

Orbit Quality

RMS
0.58842
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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