SpaceAtlas Space Object Data
NASA JPL SBDB · 2009 UL1

2009 UL1

2009 UL1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.352 AU it takes 1.57 yr to circle the Sun.

Apollo Observations: 61
Orbital Period · P
1.57 yr
v(q)
40.6 km/s
v(Q)
16.1 km/s
Diameter · ≈
0.07 km
TJ
4.62
Eccentricity · e
0.4314

Orbit and dynamics

Between its closest point (0.769 AU) and its farthest (1.935 AU), the heliocentric distance changes by 1.166 AU over every revolution.

One full revolution takes 1.57 yr (574 days), computed from the semi-major axis of 1.352 AU.

The high eccentricity (0.431) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 33.52° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 40.6 km/s at perihelion and falls to 16.1 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 = 23.5 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.07 km.

Observation record and orbit quality

Astrometry from 61 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5026 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
1.352 AU
Eccentricity
0.4314
Perihelion
0.769 AU
Aphelion
1.935253 AU
Inclination
33.52°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
167.79°

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
2031-Oct-23 10:29 0.162760 AU
24348526 km
18.66 km/s
2035-Apr-17 05:49 0.243639 AU
36447813 km
25.35 km/s
2042-Oct-24 08:54 0.222537 AU
33291075 km
17.88 km/s
2046-Apr-19 22:48 0.313532 AU
46903781 km
26.97 km/s
2053-Oct-24 20:01 0.296807 AU
44401664 km
17.21 km/s
2057-Apr-23 02:20 0.392119 AU
58660218 km
28.86 km/s
2064-Oct-24 08:05 0.377683 AU
56500647 km
16.77 km/s
2065-Mar-31 09:57 0.423185 AU
63307629 km
16.64 km/s
2068-Apr-26 11:51 0.474835 AU
71034293 km
30.93 km/s
2072-Oct-03 18:22 0.445165 AU
66595741 km
30.04 km/s
2075-Oct-23 14:41 0.458598 AU
68605270 km
16.56 km/s
2076-Mar-31 02:03 0.337860 AU
50543105 km
16.95 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
23.5

Orbit Quality

RMS
0.5026
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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