(covers information from several alternate timelines) Murasaki 312 was a quasar-like electromagnetic phenomenon located in the Alpha Quadrant near Makus III.
2267, it ionized an entire sector, including four star systems. This quasar, and others like it, generated what was known as the Murasaki Effect.
Sensor readings from the Enterprise attempted to describe Murasaki 312:
Captain James T. Kirk of the USS was under standing orders to investigate formations similar to Murasaki 312, consequently delaying the Enterprise Enterprise from a medical supply mission to Makus III, and sending the shuttlecraft to survey the formation. ( Galileo : " TOS ")
The Galileo Seven
2367, around stardate 44390,1, the USS conducted a long-range sensor scan of the Murasaki Quasar. ( Enterprise-D : " TNG ")
Later that year, Murasaki 312 appeared on a chart in
Captain Benjamin Maxwell's ready room on the USS . ( Phoenix : " TNG " The Wounded )
In an ( alternate 2366, Murasaki 312 was marked on a tactical situation monitor showing the fleet deployments in the Federation-Klingon War. : " TNG " Yesterday's Enterprise display graphic)
The location of Murasaki 312 on a tactical situation monitor
The Murasaki Effect (2267)
The tactical situation map depicted an area of space in the Alpha Quadrant. The locations Eminiar, Janus VI, Rigel, Andor, Babel, and Delta Vega were identified on "The Explored Galaxy" wall chart as being located in this quadrant.