* The nebula's 'integrated' magnitude represents its apparent brightness across the area of sky covered by the ring. A star of magnitude +3.5, seen as a point source, would be relatively bright, and certainly visible to the naked eye. The Lambda Orionis Ring, however, spreads over a significant area, covering a region more than six degrees across (and therefore more than a thirty square degrees in area). Across such a wide region, the object's magnitude is significantly diffused, so that the nebula is difficult to detect at all in visible light.
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