On 2010 October 13 , the Apollo type 20-meter asteroid 2010 TB54 passed within 6.1 lunar distances from the Earth .
On the same date , but 11.4 hours earlier , exactly at 02:52:32 UT , the sky over central Poland was illuminated by -8.6 magnitude PF131010 Ciechanów fireball .
The trajectory and orbit of the fireball was computed using multi-station data of Polish Fireball Network ( PFN ) .
The results indicate that the orbit of the meteoroid which caused the PF131010 fireball is similar to the orbit of 2010 TB54 asteroid and both bodies may be related .
Moreover , two days before appearance of Ciechanów fireball another small asteroid denoted as 2010 SX11 passed close to the Earth-Moon system .
Its orbit is even more similar to the orbit of Ciechanów fireball parent body than in case of 2010 TB54 .

The PF131010 Ciechanów entered Earth ’ s atmosphere with the velocity of 12.8 \pm 0.2 km/s and started to shine at height of 82.5 \pm 0.3 km .
Clear deceleration started after first three seconds of flight , and the terminal velocity of the meteor was only 5.8 \pm 0.2 km/s at height of 29.3 + \ - 0.1 km .
Such a low value of terminal velocity indicates that fragments with total mass of around 2 kg could survive the atmospheric passage and cause fall of the meteorites .
The predicted area of possible meteorite impact is computed and it is located near Grabowo village south of Ostrołęka city .