SpaceAtlas Space Object Data
NASA JPL SBDB · 2009 SB

2009 SB

2009 SB belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.213 AU it takes 3.29 yr to circle the Sun.

Apollo Observations: 55
Orbital Period · P
3.29 yr
v(q)
60.2 km/s
v(Q)
6.7 km/s
Diameter · ≈
0.27 km
TJ
3.13
Eccentricity · e
0.8009

Orbit and dynamics

The path is an ellipse reaching 0.441 AU from the Sun at perihelion and 3.985 AU at aphelion, a radial span of 3.544 AU.

Applying Kepler's third law to a = 2.213 AU gives an orbital period of 3.29 yr, or about 1,202 days.

The high eccentricity (0.801) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 5.45° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 60.2 km/s at perihelion and falls to 6.7 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 = 20.6 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.27 km.

Observation record and orbit quality

The current orbit solution is based on 55 observations and has a weighted RMS residual of 0.9431 arcseconds.

Condition code U = 2 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
2.213 AU
Eccentricity
0.8009
Perihelion
0.441 AU
Aphelion
3.985392 AU
Inclination
5.45°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
2.53°

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
2032-Dec-10 14:43 0.459854 AU
68793251 km
21.39 km/s
2036-May-25 12:17 0.253944 AU
37989502 km
33.24 km/s
2042-Oct-02 17:00 0.273505 AU
40915770 km
33.93 km/s
2046-Mar-26 23:44 0.434548 AU
65007512 km
19.05 km/s
2055-Dec-16 06:40 0.482010 AU
72107697 km
22.97 km/s
2059-May-26 20:13 0.256589 AU
38385207 km
33.32 km/s
2065-Sep-29 15:33 0.331717 AU
49624150 km
35.80 km/s
2078-Nov-11 23:32 0.354051 AU
52965287 km
15.95 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
20.6

Orbit Quality

RMS
0.94314
Condition
2
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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