2021 SF1
ephemeris date magn radius delta (AU) delta (LD) delta (km) ra dec elong phase
Brightest7 Oct 202119.91.015 AU0.018 AU7.19 LD2,764,482 km02h51m+24°24'145.8°33.7°
Approach12 Oct 202120.31.007 AU0.016 AU6.29 LD2,418,247 km04h59m+27°23'122.1°57.2°
Today22 Oct 202122.50.992 AU0.025 AU9.65 LD3,711,903 km08h29m+16°15'82.9°95.7°

Based on its absolute magnitude (Hₒ) of 27.2 and an albedo between 0.25 and 0.05, the estimated diameter of 2021 SF1 is 10 - 22 m.

2021 SF1- 2021-10-22

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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.