EGB 4 was discovered in 1984 by astronomers Ellis, Grayson and Bond. It is a binary star system named BZ Cam in the constellation Camelopardalis.
And no, it is still not a comet, rather an emission nebula, because BZ Cam moves with about 125Km/s through the interstellar medium.
This gives the untypical waveform of hydrogen nebulae.
This PN reminds a little bit to HFG1, but this PN has no shock front with OIII.
The idea to photograph this nebula came up in January 2020 when Peter Goodhew presented it for the first time - thank you for this object.
In fact, there are only 2 real astrophotos of this nebula on the web at this time - so I am joining as the third? and the first one with a widefield.
Also I can confirm that this object is very difficult to expose. Had to go to a darker observing site (SQM 21.65) because my sky at home was too bright for it!
today this picture was chosen as astrophoto of the week (AdW) on astronomie.de
https://forum.astronomie.de/threads/20-woche-egb-4-um-was-fuer-ein-objekt-handelt-es-sich-eigentlich.325202/
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