2021 BK
ephemeris date magn radius delta (AU) delta (LD) delta (km) ra dec elong phase
Brightest15 Jan 202332.00.844 AU0.757 AU294.74 LD113,317,771 km15h42m-22°09'56.2°75.6°
Approach16 Jan 202332.00.842 AU0.768 AU299.02 LD114,964,912 km15h50m-22°39'55.8°75.2°
Today25 Sep 202333.52.086 AU1.296 AU504.44 LD193,939,244 km20h51m-14°41'129.7°21.7°

Based on its absolute magnitude (Hₒ) of 30.3 and an albedo between 0.25 and 0.05, the estimated diameter of 2021 BK is 2 - 5 m.

2021 BK- 2023-09-25

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The interactive orbit chart above shows the near-earth object's path through the solar system and its position at the given date. Green and blue lines are shown perpendicular to the ecliptic plane: Green if the path is above the ecliptic plane, blue if it is below.

(Left-click and drag to rotate the view; right-click and drag to move the view; use scroll wheel to zoom in our out.)

The light curve chart below shows the estimated development of the NEO's magnitude during its approach to earth.

The following all-sky chart shows the path of the NEO in the coming months.

The following chart shows the path of the NEO in the coming days or hours. The field of view is optimized for (~10x50) binoculars and finderscopes. A more printer-friendly version of the same chart can be found below.