After an idea of Matthias Kronberger we both could observe the spectacular bipolar PN Sa 2-237.
Observing conditions were nearly perfect, transparency was very good (Alpine place 2900m/9500ft) seeing good.
Already with searching eyepiece the PN was visible as a bipolar structure around the faint CS. With 27" and 586x to 837x the lobes of the PN were easily visible without filters. Filters brings out the lobes a little bit better but I tried to pass on any filter. The NE lobe seems to be a little bit brighter with a spot at the W edge. The SW lobe seems to be triangular with a brighter spot to the W edge and a better defined edge along the S. Both lobes were absolute symmetrical but seems to elongated E-W, that means not in the lobe-star line NE-SW.
Matthias could also see both lobes and the CS with 15". Perhaps he could tell us more detail.
For me it was one of the easiest and most conspicuous bipolar PN I ever seen, perhaps a goal for you.
Perhaps there are some observing reports. I would be interested in the minimum aperture for the bipolar structure and the structure of the lobes itself with big aperture.
Schwarz, Corradi and Montez analyzed the PN and expected a binary star as the central object which forms the bipolar structure.
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