Gum 48a / RCW 75 HII region in Centaurus in Ha (a "Southern Elephant Trunk" nebula?) (Alexandr Zaytsev)

Gum 48a / RCW 75 HII region in Centaurus in Ha (a "Southern Elephant Trunk" nebula?)

Link: https://coalsack.online/chilescope/Cen_2023Q2/Cen_z3_T5_6x600s_Ha_a5_at.jpg

60min of integral Ha exposure of Gum 48a (aka RCW 75) HII region [1] around HD 115669 star, complete with Stock 16 open cluster (very "young" one - "only" of 4–6 Myr of age) [2] at the tip of the "dark plume" structure in the middle of the image - captured remotely using Telescope #5 (Officina Stellare Riccardi-Honders RH200 D = 200mm f/3, FLI Microline 16200) system of ChileScope on Apr 14, 2023. The images is a subframe of the full FOV of the instrument.

[1] http://galaxymap.org/cat/view/gum/48a

[2] https://articles.adsabs.harvard.edu/pdf/1985ApJ...292..148T

The original resolution image of revision B is available under [3]:

[3] https://coalsack.online/chilescope/Cen_2023Q2/Cen_z3_T5_6x600s_Ha_a5_stl_at.jpg

A wider FOV image of the central part of Cir-Cen starfield obtained with Chilescope T4 instrument are also available under [4]:

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

The main "cosmic rift" / "dark plume" part of the nebula (that one might call a "Southern Elephant Trunk" nebula) in the middle of the original image contains some remarkable compact dark clouds:

A narrower FOV image for the same area obtained with T3 instrument of Chilescope is available under [5]:

[5] https://www.astrobin.com/8hcf8i/

B

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

Uploaded: ...

C

Title: Version of the original image with full star suppression applied

Uploaded: ...

D

Title: Wider view to the scene with original orientation of the frame

Description: (Full FOV of the Chilescope T5 instrument.)

Uploaded: ...

E

Title: Version of the image under revision D with partial star suppression applied

Uploaded: ...

G

Title: Version of the image under revision D with full star suppression applied

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	7545706
PixInsight job	P0S3UHJT5X05V7X0KALXS6OTMO9LAOC9
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	13h20m23s.20
RA (top/left)	13h20m19s.60
RA (top/right)	13h12m45s.60
RA (bottom/right)	13h20m27s.63
RA (bottom/left)	13h27m59s.99

Dec (center)	-62°33′09″.10
Dec (top/left)	-61°40′28″.5
Dec (top/right)	-62°32′51″.1
Dec (bottom/right)	-63°25′44″.3
Dec (bottom/left)	-62°31′55″.2

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