SpaceAtlas Space Object Data
NASA JPL SBDB · 2002 QW47

2002 QW47

2002 QW47 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.972 AU it takes 2.77 yr to circle the Sun.

Apollo Observations: 53
Orbital Period · P
2.77 yr
v(q)
37.6 km/s
v(Q)
12 km/s
Diameter · ≈
0.25 km
TJ
3.69
Eccentricity · e
0.5176

Orbit and dynamics

Between its closest point (0.951 AU) and its farthest (2.993 AU), the heliocentric distance changes by 2.042 AU over every revolution.

One full revolution takes 2.77 yr (1,011 days), computed from the semi-major axis of 1.972 AU.

The high eccentricity (0.518) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

Its inclination of 4.22° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 37.6 km/s at perihelion and falls to 12 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 = 20.79 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.25 km.

Observation record and orbit quality

Astrometry from 53 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5587 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
1.972 AU
Eccentricity
0.5176
Perihelion
0.951 AU
Aphelion
2.992707 AU
Inclination
4.22°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
236.5°

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
2027-Apr-17 22:20 0.163198 AU
24414106 km
14.01 km/s
2038-Jul-18 17:04 0.017269 AU
2583400 km
10.31 km/s
2052-Apr-16 05:50 0.180090 AU
26941108 km
14.65 km/s
2063-Aug-11 15:30 0.269680 AU
40343625 km
17.96 km/s
2077-May-07 05:54 0.069995 AU
10471080 km
9.58 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
20.79

Orbit Quality

RMS
0.55871
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

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