BN moves towards the northwest with respect to other stars in the
Kleinmann-Low nebula. A
proper motion of between 21 and 27 km/s in the northwest region and a redshift of about 11 km/s with respect to the OMC1 was measured for this star. BN is therefore considered a
runaway star. It was proposed that
Theta1Ori C ejected BN about 4000 years ago, but it is more likely that BN and two other runaway stars, called Source I (Src I) and Source n (Src n), were ejected from a position about 500 years ago. Source I and Source n both move in opposite directions, away from BN. The ejection of BN and source I was proposed to have occurred in the year
1475±6 (about 550 years ago). IRc23 was ejected only 300 years ago.
Explosion remnant The remnant of the explosion is called
Kleinmann-Low nebula. Multi-wavelength observations and
carbon monoxide (CO) observations with
ALMA reveal the mostly spherical remnant of an explosion at the intersection point of the BN object and Source I. The ALMA observations revealed hundreds of CO streamers moving with up to 100 km/s. Some of these CO streamers nearly reach the shocked gas and dust observed in
molecular hydrogen and
iron [Fe II]. == Becklin's star ==