Proper Motions of the Radio Source Orion MR, Formerly Known as Orion n,
  and New Sources with Large Proper Motions in Orion BN/KL
  The infrared source known as Orion n was detected in 1980 with observations
made with the 3.8-m United Kingdom Infrared Telescope. About two decades later,
sensitive observations made with the Very Large Array revealed the presence of
a mJy double radio source apparently coincident in position with the infrared
source n. The radio source was assumed to be the counterpart of the infrared
source. However, over the years it has been concluded that the radio source
shows large proper motions to the south while the infrared source n is
stationary. Here we reanalyze the proper motions of the radio source adding
both older and newer VLA observations than previously used. We confirm the
proper motions of the radio source that at present no longer coincides
positionally with the infrared source. The solution to this problem is, most
probably, that the infrared source n and the radio source are not the same
object: the infrared source is a stationary object in the region while the
radio counterpart is moving as a result of the explosion that took place in
this region some 500 years ago and that expelled large amounts of molecular gas
as well as several compact sources. Considering the paper where it was first
reported, we refer to this double radio source as Orion MR.
  In addition, we use these new observations to fully confirm the large proper
motions of the sources IRc23 and Zapata 11. Together with sources BN, I, Orion
MR, and x, there are at least six compact sources that recede from a point in
common in Orion BN/KL. However, IRc23 is peculiar in that its ejection age
appears to be only $\sim$300 years. The relatively large number of sources
rules out as a possible mechanism the classic three-body scenario since then
only two escaping bodies are expected: a tight binary plus the third star
involved in the encounter.
