WHAT A SURPRISE FOR THE TEAMWhen we discovered this unusual and interesting nebula with internal apparent bow shock not far from the Elephant Trunk Nebula / IC 1396 in 2019, we initially believed it to be a planetary nebula.
But the absence of a central white dwarf in such a bright object was unusual, even if the bubble-like structure suggested a planetary nebula.
But a spectrum made by Pascal le Dû revealed the surprise - an SII signal suggesting shocked gas. What this object is is not yet clear, but another piece of the puzzle is a very clear and strong radio signal identified in the NVSS survey.
Strottner-Drechsler 4Koordinaten: 21:41:30.82 +55:47:52.78
Dimensionen: 3 x 2.3 arcmin
The object was decisively revealed by the unusually strong SII signal that is caused by gases being shocked very strongly.
In this excerpt from the IPHAS H-alpha Survey, it can be seen that the internal structure is not a bubble, but rather a bow shock.
Spectroscopically observed by a French amateur group at Kermerrien Observatory (Porspoder, France) on 12/03/2019 by P. Le Dû. [NII]>H-alpha, strong [SII], H-beta in blue only.
The NRAO VLA Sky Survey (NVSS) is a 1.4 GHz continuum survey covering the entire sky north of -40 deg declination. 
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