SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 PU1

2011 PU1

2011 PU1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.304 AU it takes 1.49 yr to circle the Sun.

Apollo Observations: 110
Orbital Period · P
1.49 yr
v(q)
33.5 km/s
v(Q)
20.3 km/s
Diameter · ≈
0.03 km
TJ
4.96
Eccentricity · e
0.2459

Orbit and dynamics

The path is an ellipse reaching 0.983 AU from the Sun at perihelion and 1.625 AU at aphelion, a radial span of 0.642 AU.

Applying Kepler's third law to a = 1.304 AU gives an orbital period of 1.49 yr, or about 544 days.

An eccentricity of 0.246 makes the orbit moderately elongated.

Its inclination of 4.36° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 33.5 km/s at perihelion and falls to 20.3 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 = 25.6 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.03 km.

Observation record and orbit quality

The current orbit solution is based on 110 observations and has a weighted RMS residual of 0.3882 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
1.304 AU
Eccentricity
0.2459
Perihelion
0.983 AU
Aphelion
1.624654 AU
Inclination
4.36°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
8.27°

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
2029-Apr-11 16:29 0.468901 AU
70146581 km
18.68 km/s
2029-Oct-23 18:40 0.487422 AU
72917288 km
7.24 km/s
2075-Feb-17 16:40 0.475792 AU
71177461 km
7.55 km/s
2075-Aug-30 21:26 0.451269 AU
67508854 km
18.35 km/s
2078-Feb-27 18:12 0.427761 AU
63992132 km
6.60 km/s
2078-Aug-24 13:10 0.331157 AU
49540440 km
14.89 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
25.6

Orbit Quality

RMS
0.38817
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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