SpaceAtlas Space Object Data
NASA JPL SBDB · 2009 UG

2009 UG

2009 UG is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.788 AU and a period of 0.70 yr.

Aten Observations: 279
Orbital Period · P
0.70 yr
v(q)
49.8 km/s
v(Q)
22.6 km/s
Diameter · ≈
0.07 km
TJ
7.32
Eccentricity · e
0.3754

Orbit and dynamics

Between its closest point (0.492 AU) and its farthest (1.084 AU), the heliocentric distance changes by 0.592 AU over every revolution.

One full revolution takes 0.70 yr (255 days), computed from the semi-major axis of 0.788 AU.

An eccentricity of 0.375 makes the orbit moderately elongated.

The orbital plane is tilted 5.02° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 49.8 km/s at perihelion and falls to 22.6 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 279 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3098 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
0.788 AU
Eccentricity
0.3754
Perihelion
0.492 AU
Aphelion
1.083815 AU
Inclination
5.02°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
68.92°

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-Oct-02 17:12 0.033053 AU
4944704 km
8.48 km/s
2037-Oct-14 05:27 0.077231 AU
11553653 km
7.74 km/s
2044-Oct-27 23:16 0.096585 AU
14448908 km
7.67 km/s
2051-Nov-12 12:58 0.093381 AU
13969640 km
7.69 km/s
2058-Nov-21 18:48 0.081984 AU
12264636 km
7.93 km/s
2065-Nov-26 10:48 0.073528 AU
10999686 km
8.39 km/s
2072-Nov-29 06:03 0.071052 AU
10629159 km
8.98 km/s
2074-Sep-29 09:52 0.197989 AU
29618784 km
15.63 km/s
2079-Dec-01 12:11 0.074859 AU
11198696 km
9.60 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
0.30979
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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