The Ghost of Hadar (fully structurally resolved for the first time!) (Alexandr Zaytsev)

The Ghost of Hadar (fully structurally resolved for the first time!)

Revision title: Narrower view to the center of the original image, processed to emphasize the diffuse structures

Link: https://coalsack.online/chilescope/Cen_2023Q1/Beta_Cen_T3_z1_11x180s_Ha_a4_at.jpg

33min of integral Ha exposure of immediate surroundings of Beta Centauri (Hadar) showing surprisingly complex structures not so noticeable in G or B broadband or OIII exposures (and barely visible in SII and R exposures) - captured remotely using Telescope #3 (ASA-N D = 0.5m f/3.8, FLI ProLine 16803) system of ChileScope on Mar 28, 2023. Original revisions and revision B-E are based on this Ha exposure.

Revision F is a separate 33min integral OIII exposure of exactly the same target captured with the same instrument on Mar 29, 2023. The OIII exposure shows none of the structures visible on Ha exposure.

Revision G is another separate 24min integral SII exposure of exactly the same target captured with the same instrument on Apr 1, 2023. The SII exposure shows a hint of structures visible on Ha exposure, so making a two-color narrowband Ha / SII composite image for this scene should be possible.

A wider FOV image of the central part of Cir-Cen starfield obtained with Chilescope T4 instrument are also available under [1]:

[1] https://www.astrobin.com/gcqtmj/

Since the attempts to find any previous optical images that would show the full structure of this nebula or even explicit references in the literature were unsuccessful so far (as of Apr 16, 2023, albeit its presence is found in several all-sky surveys which were reveling no internal structure or just a hint of presence - as identified during the discussion in Forum thread [2]), it is possible that this object was fully structurally resolved here for the first time!

[2] https://www.astrobin.com/forum/c/astrophotography/other/need-help-identifying-nebulae-in-immediate-vicinity-14-radius-of-beta-cen/

B

Title: Version of the original image with partial star suppression and additional corrections applied

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C

Title: Narrower view to the center of the original image, processed to emphasize the diffuse structures

Description: (Also slightly rotated for better composition.)

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D

Title: Version of the revision C with partial star suppression and additional corrections applied

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E

Title: Understanding parasitic light from the main star (Beta Cen) in the original image

Description: The fully star suppressed version of original revision of the image showing the Newtonian aperture effects in that image, remaining after the image integration / detects rejection. Most of these effects, except the inner disks are completely masked by the starfield otherwise.

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F

Title: A "control exposure" in OIII showing the parasitic light from the main star (Beta Cen) but no sign of structures visible in Ha

Description: 33min of integral OIII exposure of immediate surroundings of Beta Centauri (Hadar) - captured remotely using Telescope #3 (ASA-N D = 0.5m f/3.8, FLI ProLine 16803) system of ChileScope carried out on Mar 29, 2023.

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G

Title: Another "control exposure" in SII showing a hint structures visible in Ha

Description: 24min of integral SII exposure of immediate surroundings of Beta Centauri (Hadar) - captured remotely using Telescope #3 (ASA-N D = 0.5m f/3.8, FLI ProLine 16803) system of ChileScope carried out on Apr 1, 2023.

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I

Title: Custom annotated version of Ha exposure close-up view (revision C)

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J

Title: Custom annotated version of OIII exposure close-up view (revision F)

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K

Title: Custom annotated version of SII exposure close-up view (revision G)

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L

Title: Yet another "control exposure" in R showing traces of structures visible in Ha

Description: 1h 9min of integral R exposure of immediate surroundings of Beta Centauri (Hadar) - captured remotely using Telescope #3 (ASA-N D = 0.5m f/3.8, FLI ProLine 16803) system of ChileScope during two imaging session carried out on Apr 12 & 13, 2023.

Uploaded: ...

M

Title: Custom annotated version of R exposure close-up view (revision L)

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Status	Advanced success
Started	...
Astrometry.net job	7449860
PixInsight job	TGNYXH3ZDM4TX0DPJ8SPW88KTSQY2ZES
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	14h03m44s.165
RA (top/left)	14h01m49s.939
RA (top/right)	14h01m28s.337
RA (bottom/right)	14h05m40s.439
RA (bottom/left)	14h05m58s.185

Dec (center)	-60°22′15″.46
Dec (top/left)	-60°05′31″.65
Dec (top/right)	-60°36′26″.29
Dec (bottom/right)	-60°38′53″.31
Dec (bottom/left)	-60°07′56″.59

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