The Shells of HB3 in Cassiopeia (pete_xl)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: IC 1795 · LBN 641 · LBN 642 · LBN 645 · LBN 646 · LBN 647 · LBN 648 · LBN 650 · LDN 1354 · LDN 1356 · LDN 1359 · LDN 1361 · LDN 1364 · NGC 886 · NGC 896 · PGC 138505 · PGC 166428 · PGC 168265 · PGC 2658552 · PGC 2669166 · PGC 2796808 · PGC 2796827 · PGC 2796836 · PGC 2796841 · PGC 2796845 · PGC 2796860 · PGC 2796862 · PGC 2796866 · PGC 2796876 · PGC 2796879 · And 16 more.

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The Shells of HB3 in Cassiopeia

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The Shells of HB3 in Cassiopeia

The supernova remnant HB3 (SNR G132.7+1.3) in the constellation Cassiopeia is one of the largest galactic SNRs currently known. Its physical size is reported to be about 60×80 pc, based on an assumed distance of 2 kpc.

In the sky HB3 extends to about 1°.5 × 2.0°, its age is given as about 30 000 years. In my image, the object appears as a shell-like structure with finely differentiated segments of energized Ha, SII and OIII.
The SNR is located directly northwest of the structure of the Fish Head Nebula IC 1795, i.e. in a frequently photographed region of the sky. In the image, approximately in the direction of 1 o'clock, the 1.0' small PN A66 can also be found. Furthermore, inside the SNR, at about 10 o'clock, the 0.5' small PN G132.8+02.0 shines.

The image is a composite of Ha, SII and OIII data for the background and RGB for the stars. As a photographic target, HB3 is quite challenging as it is very faint. I would have liked to invest a multiple of the shooting time, but the weather in western Germany in fall/winter 2023 is so bad that I gave up after half of the originally planned shooting time and started image processing. There was sometimes very poor transparency during the shooting nights and it was often very windy. A lot of data had to be discarded. I therefore needed 7 nights for the approximately 15 hours of total exposure time that remained.

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Status	Advanced success
Started	...
Astrometry.net job	8813887
PixInsight job	67LONVO58TM1IMVP9X2YKHQF4TQYA82O
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	02h18m09s.65
RA (top/left)	02h25m42s.75
RA (top/right)	02h05m05s.12
RA (bottom/right)	02h11m31s.11
RA (bottom/left)	02h29m59s.26

Dec (center)	+62°54′34″.8
Dec (top/left)	+64°46′11″.7
Dec (top/right)	+64°20′27″.0
Dec (bottom/right)	+61°01′34″.8
Dec (bottom/left)	+61°24′36″.9

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The Shells of HB3 in Cassiopeia

The Shells of HB3 in Cassiopeia

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