Rarely Imaged Supernova Remnant SNR G156.2+5.7 (Mau_Bard)

Rarely Imaged Supernova Remnant SNR G156.2+5.7

This is a picture of a large, faint and rarely imaged Supernova Remnant that lies at the intersection of Camelopardalis, Auriga and Perseus.
The work has been done in Ha-Oiii, therefore oriented to capture the Supernova Remnant signal, that, notwithstanding the long exposure (30h 40') and the luminous focal, resulted extremely faint in the light master. Processing has been not that easy. I purposely left the background sky quite bright, in order to make the foreground dark nebulae more visible, even if this worsens the esthetic result. I am planning further imaging work in this area, weather allowing.

SNR G156.2+5.7
It is a large supernova remnant with exceptional high X-ray brightness, but extremely faint in visual range. If we include the external filamentary structure visible in picture 1, it covers the conspicuous area of 2,5 x 2,5 degrees. A 2016 study (*) estimates its distance to be > 1.7 kpc and its age around 10000 yr. This rules out the possibility that G156.2+5.7 is physically associated with part of the Taurus-Auriga dust complex at a distance of 200-300 pc.

(*) www.researchgate.net/publication/303494295_Constraining_the_Age_and_Distance_of_the_Galactic_Supernova_Remnant_G156257_by_H-alpha_Expansion_Measurements

Picture 1: Hα mosaic image of the G156.2+5.7 SNR taken at the McDonald Observatory (Gerardy & Fesen 2007). The image enhances external faint and beautiful filamentary structures.

NGC1708
Is an open cluster, distant 1960 ly, and 575 million years old discovered by John Herschel en 1831. It has a diameter of 12,5 ly.

Picture 2: NGC 1708

NGC1790
It is an open cluster situated at nearly 10000 ly.

Picture 3: NGC1790

Berkeley 13
This open cluster lies at nearly 13000 ly, according to 2021 parallax estimates.

Picture 4: The cute Berkeley 13

NGC1724
It is an open cluster located 12300 ly away in Auriga. The distance has been evaluated with parallax method twice, hence pretty reliably.

Picture 5: NGC1724

LDNxxx
These dark nebulae home of intense star formation lie in front of the SNR and are better visible in broadband images.

Final
Original
B
C

B

Title: Starless Annotated

Uploaded: ...

C

Title: Annotated

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	9185769
PixInsight job	4O57ZMDHDSAN1UHW22UT65IGF49TCV7B
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	04h57m36s.90
RA (top/left)	05h15m32s.61
RA (top/right)	04h39m26s.19
RA (bottom/right)	04h41m35s.86
RA (bottom/left)	05h13m52s.81

Dec (center)	+51°41′01″.5
Dec (top/left)	+54°06′57″.4
Dec (top/right)	+54°04′20″.6
Dec (bottom/right)	+49°06′26″.5
Dec (bottom/left)	+49°08′31″.4

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