Orbit and dynamics
The path is an ellipse reaching 0.811 AU from the Sun at perihelion and 1.082 AU at aphelion, a radial span of 0.271 AU.
Applying Kepler's third law to a = 0.947 AU gives an orbital period of 0.92 yr, or about 336 days.
An eccentricity of 0.143 makes the orbit moderately elongated.
The orbital plane is tilted 5.3° relative to the ecliptic.
By the vis-viva equation its orbital speed rises to 35.4 km/s at perihelion and falls to 26.5 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
Neither a measured diameter nor a reliable absolute magnitude is available for 2021 BO, so its physical size remains unconstrained.
Observation record and orbit quality
The current orbit solution is based on 40 observations and has a weighted RMS residual of 0.3231 arcseconds.
Condition code U = 4 indicates a moderately constrained orbit; predictions decades ahead still carry noticeable uncertainty.
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
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 distance | Velocity |
|---|---|---|
| 2030-Sep-30 01:24 | 0.473251 AU 70797334 km |
18.77 km/s |
| 2031-Sep-04 19:40 | 0.072414 AU 10832998 km |
4.61 km/s |
| 2032-May-01 07:26 | 0.210988 AU 31563323 km |
5.80 km/s |
| 2033-Jan-15 12:18 | 0.153358 AU 22941968 km |
9.51 km/s |
| 2042-Sep-20 10:43 | 0.249413 AU 37311622 km |
11.88 km/s |
| 2043-Jun-28 16:23 | 0.181164 AU 27101776 km |
5.53 km/s |
| 2043-Dec-30 08:58 | 0.082929 AU 12405964 km |
3.76 km/s |
| 2045-Jan-05 20:01 | 0.398320 AU 59587884 km |
16.98 km/s |
| 2054-Sep-07 02:21 | 0.072160 AU 10794965 km |
5.18 km/s |
| 2055-May-06 21:27 | 0.211408 AU 31626219 km |
5.88 km/s |
| 2056-Jan-16 16:26 | 0.134301 AU 20091094 km |
8.93 km/s |
| 2065-Sep-21 03:40 | 0.276696 AU 41393133 km |
12.61 km/s |
| 2066-Jul-05 01:26 | 0.172548 AU 25812746 km |
5.30 km/s |
| 2066-Dec-17 19:56 | 0.102207 AU 15289917 km |
3.84 km/s |
| 2068-Jan-07 16:34 | 0.373930 AU 55939129 km |
16.12 km/s |
| 2077-Sep-09 22:26 | 0.088996 AU 13313563 km |
6.33 km/s |
| 2078-May-16 22:39 | 0.211197 AU 31594575 km |
6.00 km/s |
| 2079-Jan-17 16:05 | 0.087174 AU 13040979 km |
7.51 km/s |
Distances in astronomical units (AU) and kilometres. Source: NASA/JPL CNEOS Close Approach Data API.
Physical Parameters
Orbit Quality
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