This is a deprecated image. The new, better version is visible
here!
I recorded the not-so-narrow-band data (L-eNhance filter has 10 nm Ha and 24nm OIII) during 4 night in July 2023, with my new Samyang 135 setup.
The left side of the picture is pointing North.
SNR G065.2+05.7The picture covers the area of south Cygnus around Albireo, but its main character is the huge supernova remnant SNR G065.2+05.7, that covers an area of approximately 5 x 3 degrees (that is 6 x 10 moon diameters).
It is a real invisible elephant in the room: we observed this area many times without knowing that this giant is sitting there just in front of our eyes. Only it is too faint to be seen, and even in narrowband pictures its signal is extremely weak. The brighter portions of it have been numbered separately as Sh2- 91, 94 and 96.
It was detected as a single object by Gull et alii in 1977 during an optical survey. Estimates of its linear diameter is ~70 pc (230 ly) and its distance is 0.8+-0.2 kpc (~2600 ly). It age is about 20000 years.
The Ha and OIII signals are remarkably different, and the Ha is mixing up with the emission background, therefore it is not easy to understand the shape of the object. The second article quoted below states that SNR G065.2+05.7 is an example of a barrel–shaped supernova remnant. Initially I thought that the Sh2-96 area was a "Champagne flow", but I have found no statement about that.
Interesting is
the 2002 article by the University of Crete, Physics Department and
this other.
A
nice page has been dedicated to it by Stephane Zoll.
I came to know about it and was inspired by the beautiful image of
@Walter Leonhard Schramböck.Sh2-92Sh 2-92 is ionized by the Wolf-Rayet star WR 127, a binary star with an O9V companion.
Sh2-91, Sh2-94 and Sh2-96As already mentioned these are all filaments of the supernova remnant SNR G065.2+05.7.
NGC6813NGC6813 and several other planetary nebulae are visible in the picture.
NGC6815NCG6815 is just an association of stars in Vulpecula, discovered by John Herschel in 1828.
Comments