SpaceAtlas Space Object Data
NASA JPL SBDB · 2004 WH1

2004 WH1

2004 WH1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.197 AU it takes 1.31 yr to circle the Sun.

Apollo Observations: 50
Orbital Period · P
1.31 yr
v(q)
33.4 km/s
v(Q)
22.2 km/s
Diameter · ≈
0.06 km
TJ
5.29
Eccentricity · e
0.2031

Orbit and dynamics

The path is an ellipse reaching 0.954 AU from the Sun at perihelion and 1.44 AU at aphelion, a radial span of 0.486 AU.

Applying Kepler's third law to a = 1.197 AU gives an orbital period of 1.31 yr, or about 478 days.

An eccentricity of 0.203 makes the orbit moderately elongated.

Its inclination of 2.67° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 33.4 km/s at perihelion and falls to 22.2 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 = 24.04 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.06 km.

Observation record and orbit quality

The current orbit solution is based on 50 observations and has a weighted RMS residual of 0.4953 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
1.197 AU
Eccentricity
0.2031
Perihelion
0.954 AU
Aphelion
1.440111 AU
Inclination
2.67°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
127.1°

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
2043-Jan-18 22:52 0.043698 AU
6537147 km
3.45 km/s
2063-Nov-15 03:13 0.040708 AU
6089764 km
5.25 km/s
2064-Mar-21 10:10 0.199524 AU
29848322 km
2.40 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
24.04

Orbit Quality

RMS
0.49532
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.

Keep exploring

Explore asteroids, comets and near-Earth objects with JPL orbital data.