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: ...

Open Star Clusters
Narrowband imaging
PixInsight Addicts
Edit with Mouseover
Deep Sky Mosaics
Dark Nebula
Planetary Nebulae
FLI Microline images
AstroBin Platform open discussions community forum
Black and White images
Rarely Imaged Small DSOs
Southern Hemisphere Astro
Imaging off the beaten track
Processed with Photoshop

	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Advanced success
Started	...
Astrometry.net job	7726596
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

Image Index:

Contribution Index (beta):