I discovered this object by chance while browsing SkytechX.
Rarely imaged, I searched astrobin and found no more than six images
of it (and only 1 in wide field). This huge and diffuse nebula barely fit in a 135mm frame.
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The nature of this huge filament has long been debated. Its position,
in galactic coordinates apparently coincident with the edges of Vela ,
led some scientists to believe that it could be the northern wall
of the large superbubble that constitutes the body of that nebula,
also due to its emissions in Hα ; Other scientists, however,
note that these filaments are very far from the nebula's point of origin,
and the same radial velocity appears different: this scenario has led
scholars to hypothesize that it may be a cloud separate from the Vela Nebula
and with a different movement, facing towards us.
(italian wikipedia https://it.wikipedia.org/wiki/Sh2-312).
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