LBN641 - A Portion of a Supernova Remnant (HB3)

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
 

LBN641 - A Portion of a Supernova Remnant (HB3)
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
Camera: ZWO ASI1600MM-Pro
Telescope: Astro-Tech AT115EDT 115mm Refractor Telescope
Barlow: None
Focal Length: 805mm (644mm w/ FR)
f/7
Focal Reducer: 0.8x AstroTech Field Flatterner/Focal Reducer
Mount: Orion Sirius
Filter Wheel: ZWO
EFW 8 x 1.25"
Filter: Antlia Ha, OIII; ZWO R, G, B
Focuser: ZWO EAF
Autoguiding: ASI120 Mini attached to an Agena 50mm Guide Scope/ZWO 60mm Guidescope
Exposure: Ha 163 x 300, OIII 148 x 300, R 72 x 90, G 68 x 90, B 60 x 90
Gain: 139
Offset 20
Sensor Temp: -10 C
Processing: NINA, PixInsight, Photoshop, BlurXTerminator, StarXTerminator, NoiseXTerminator, GraXpert, Bill Blanchan Star Reduction, Bill Blanchan Color Masks.

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IC 5146 - Cocoon Nebula (wide field)

This is my wide field shot of the region around IC 5146, the Cocoon Nebula (also Caldwell 19, Sh 2-125, Barnard 168), in the Cygnus constellation. IC 5146 is an emission and reflection nebula 15 light years wide and located 4000 light years away. There is a lot of dust in around IC 5146 with a dark dust tail containing several dark nebulae streaming towards the top of my image. These dark nebulae are in Lynds Dark Nebula catalog and designated LDN 1042, 1045, 1047, 1030, 1031, 1040, 1035 and 1040 where LDN 1042 is closest to IC 5146 and LDN 1040 is farthest away. My favorite is LDN 1035 which seems to resemble a crown at the top center of my image.

IC 5146 is relatively bright and ionized hydrogen gas gives it the reddish glow. The small blue reflection nebula to the upper right of IC 5146 is vdB 147. This image was taken with the ASI2600 MC (a color camera) and I did not use a filter in order to capture the heavily dusted region as well as the stars, however, to capture the faint red glow of the ionized hydrogen in the background I used the dual band IDAS NBZ filter. This filter is capable of picking up ionized hydrogen (red) and ionized oxygen (blue). The two separate images were then blended inorder to highlight the dust and stars of the unfiltered data and the glowing hydrogen of the filtered image.

On the left side of the image there is a blue nebula surrounding bright star coordinates, ~ 49 03 16, 22 00 23, which only shows up in the data collected using the dual band IDAS NBZ filter. Since it is blue that would indicate that it is composed of oxygen rather than the hydrogen that predominates most of the background in this region.

Addendum: The OIII nebulosity on the left is indeed an object discovered in 2019 by Marcel Drechsler and Andreas Zirke. They described it as an OIII structure surrounding the star HD 209204 and designated it as Drechsler - Zirke 1 (https://www.astrobin.com/f8o5xg/?q=Drechsler-%20Zirke%201).

Dates: 10-2-23, 10-3, 10-4, 10-10, 10-11, 10-12, 10-13, 11-1, 11-2, 11-5, 11-12

Combined RGB and IDAS NBZ

RGB 

IC 5146 - Cocoon Nebula (wide field)
Dates: 10-2-23, 10-3, 10-4, 10-10, 10-11, 10-12, 10-13, 11-1, 11-2, 11-5, 11-12
Camera: ZWO ASI2600MC Pro
Telescope: Askar FRA300 Pro
Barlow: None
Focal Length: 300mm
F/5
Focal Reducer: None
Mount: Orion Atlas Pro
Filter Adaptor: ZWO Filter Drawer
Filter: IDAS NBZ, Camera UV-IR
Focuser: ZWO EAF
Autoguiding: ASI120 Mini attached to a ZWO Mini guidescope
Exposure: UV-IR 358 x 120 (11h 56m), NBZ 318 x 180 (15h 54m)
Gain: 100
Offset 0
Temp: -10 C
Processing: Asiair app, PixInsight, Photoshop, BlurXT, NoiseXT, StarX, Bill's Color Masks, Bill's Star Reduction, GraXpert

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