Although LBN641 is not commonly imaged on its own, it pops up in many widefield images of the IC1805 a.k.a. the Heart Nebula. It is actually a portion of a very faint but large supernova remnant (SNR) designated as HB3 (SNR G132.7+1.3) just west of IC1795 a.k.a. the Fishhead Nebula. Although there is not much information on LBN641, I did find some information on the Deep-sky Imaging webpage by Charles Bracken. The SNR was detected by a radio survey in 1953. Following the survey a small amount of hydrogen (Ha) was detected, however, the OIII was not detected until 1982. It is estimated that the supernova event that created this nebula occurred 30,000 years ago.
There is quite a bit of Ha and OIII scattered throughout the region, however, it is quite dim in fact the OIII was barely visible in any of the subframes. I did some star reduction and could have done more in order to bring out the nebula more but I really like the colorful starfield. I know I am behind the times but I finally got Spectral Photometric Color Calibration (SPCC) to work so I have a better feeling the star colors are somewhat accurate. SPCC along with the new version of BlurXTerminator made processing the stars a breeze. I really like the fine wispy detail in the out edges of the nebula, especially the Ha portion so I decided to keep the image background on the darker side. I have seen more nebulosity in some images of this region including my widefield attempt from last year, but doing that masks some of the fine detail so it is a bit of a balancing act.
Dates: 9-26-23, 9-27, 10-2, 10-3, 10-4, 10-22, 10-23, 10-24, 11-1, 11-2, 11-7, 11-9, 11-12, 11-14, 11-16, 11-18
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