Alpha Cen to RCW 85 starfield mosaic in Ha (Alexandr Zaytsev)

Alpha Cen to RCW 85 starfield mosaic in Ha

Revision title: Original version of the image manually annotated for the objects of interest

Link: https://coalsack.online/chilescope/Cen_2023Q2/Cen_T5_26x600s_Ha_pan2_at.jpg

4h 20min of integral Ha exposure of the region between Alpha Cen and RCW 85 object, featuring numerous emission, reflection, planetary and dark nebulae and RCW 85 HII region - captured remotely using Telescope #5 (Officina Stellare Riccardi-Honders RH200 D = 200mm f/3, FLI Microline 16200) system of ChileScope on Apr 26 and 30, 2023.

The image is a two tile mosaic comprised of 12 frames stacked for tile 1 on the RCW85 side collected on Apr 26, 2023 and 14 frames stacked for tile 2 on the Alpha Cen side collected on Apr 30, 2023.

Besides the RCW 85 which is also captured earlier under [1] and [2] with Chilescope T3 and T1 instruments

[1] https://www.astrobin.com/502va6/

[2] https://www.astrobin.com/s69kvh/

the most prominent objects in this field are the open star cluster NGC 5617 accompanied by a smaller open cluster Cl Pismis 19 [3], [3(a-c)] (on the right) and PK 315-00.1 (Henize 2-111) planetary nebula of an unusual "barred spiral" shape (in the left lower corner):

[3] http://simbad.cds.unistra.fr/simbad/sim-id?Ident=Cl+Pismis+19&

[3(a)] https://iopscience.iop.org/article/10.1086/300443

[3(b)] https://iopscience.iop.org/article/10.1086/300443/pdf

[3(c)] https://academic.oup.com/mnras/article/347/2/625/1747096

The circular halo around R Cen is an aperture effect:

Furthermore, PK 315-01.1 (PN LoTr 9) planetary nebula [4] is also visible in this frame in the lower left side (zoom to 200% of original resolution in the cropped image below):

[4] http://simbad.cds.unistra.fr/simbad/sim-id?Ident=PN+LoTr+9&

A wider FOV image of the central part of Cir-Cen starfield obtained with Chilescope T4 instrument are also available under [5]:

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

The original resolution for the custom annotated original image (revision B) is also available under [6]:

[6] https://coalsack.online/chilescope/Cen_2023Q2/Cen_T5_26x600s_Ha_pan2_at_r.jpg

Two diffuse objects identified as "aCen Nebula X1" and "aCen Nebula X2" and annotated accordingly on revisions E, F and H are also identified on the images obtained earlier with Chilescope T3 instrument under [11] and the close-up image of "aCen Nebula X2" was also later obtained with Chilescope T1 instrument under [12]:

[11] https://www.astrobin.com/i72dq4/

[12] https://www.astrobin.com/84nak0/

B

Title: Original version of the image custom annotated with PixInsight tools

Uploaded: ...

C

Title: Version of the image with partial star suppression applied

Uploaded: ...

D

Title: Version of the image with full star suppression applied, for better identification aperture effects and diffuse structures

Description: The arc in the middle and the large circular structure on the right are likely the result of scattered light from Alpha Cen.

Uploaded: ...

E

Title: Original version of the image manually annotated for the objects of interest

Uploaded: ...

F

Title: Original version of the image with full star suppression manually annotated for the objects of interest

Uploaded: ...

G

Title: A subframe of the original image with full star suppression for the vicinity of Alpha Cen

Uploaded: ...

H

Title: A subframe of the original image with full star suppression for the vicinity of Alpha Cen - manually annotated

Uploaded: ...

I

Title: A subframe of the version of the image with full star suppression for the RCW 85 region

Description: Higher resolution version of the same scene is available under [13]:

[13] https://www.astrobin.com/502va6/D/

Uploaded: ...

J

Title: Original version of the image manually annotated for the objects of interest with 2 additional overlays

Description: Overlays on the right showing narrower FOV images obtained with Chilescope T3 instrument published under [14] and [15]:

[14] https://www.astrobin.com/6vb6nv/0/

[15] https://www.astrobin.com/502va6/0/

Uploaded: ...

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Status	Advanced success
Started	...
PixInsight job	2XLDM7APNL99EI65T8SCQRLKKFZ7V49W
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	14h28m15s.51
RA (top/left)	14h41m55s.50
RA (top/right)	14h14m29s.55
RA (bottom/right)	14h13m29s.13
RA (bottom/left)	14h43m06s.90

Dec (center)	-60°40′49″.5
Dec (top/left)	-59°23′37″.3
Dec (top/right)	-59°24′45″.8
Dec (bottom/right)	-61°52′22″.2
Dec (bottom/left)	-61°51′25″.2

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