Hemisphere:  Southern  ·  Constellation: Corona Australis (CrA)  ·  Contains:  IC 4812  ·  IC4812  ·  NGC 6723  ·  NGC 6726  ·  NGC 6727  ·  NGC 6729  ·  NGC6723  ·  NGC6726  ·  NGC6727  ·  NGC6729
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IC 4812 & NGC 6726/27, 



    
        

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IC 4812 & NGC 6726/27

Getting plate-solving status, please wait...
IC 4812 & NGC 6726/27, 



    
        

            Los_Calvos
Powered byPixInsight

IC 4812 & NGC 6726/27

Imaging telescopes or lenses: PlaneWave Instruments CDK 12.5"

Imaging cameras: Moravian Instrument G4-16000

Mounts: Astro-Physics Inc AP 1100 GTO

Guiding telescopes or lenses: PlaneWave Instruments CDK 12.5"

Guiding cameras: Atik 414EX

Software: TheSkyX  ·  Adobe Photoshop CC 2020  ·  Pixinsight  ·  MaxPilote  ·  FocusMax4

Filters: Chroma Technology Chroma Ha 3nm  ·  Chroma Technology Chroma OIII 3nm  ·  Chroma Technology Chroma Blue  ·  Chroma Technology Chroma Green  ·  Chroma Technology Chroma R  ·  Chroma Technology Chroma L  ·  Chroma Technology Chroma SII 3nm

Accessory: Skyméca DO 3"


Dates:May 16, 2021May 17, 2021May 18, 2021May 19, 2021

Frames:
Chroma Technology Chroma Blue: 40x300" (3h 20') -20C bin 1x1
Chroma Technology Chroma Green: 40x300" (3h 20') -20C bin 1x1
Chroma Technology Chroma L: 86x300" (7h 10') -20C bin 1x1
Chroma Technology Chroma R: 37x300" (3h 5') -20C bin 1x1

Integration: 16h 55'

Darks: ~55

Flats: ~7

Bias: ~200

Avg. Moon age: 5.66 days

Avg. Moon phase: 32.50%

Bortle Dark-Sky Scale: 1.00


Astrometry.net job: 4720439

RA center: 19h 1' 17"

DEC center: -36° 55' 25"

Pixel scale: 0.732 arcsec/pixel

Orientation: 1.071 degrees

Field radius: 0.552 degrees


Resolution: 3860x3810

Data source: Own remote observatory

Remote source: Observatorio El Sauce

Description

This time, we turned to a more well-known region that we find beautiful and very varied:

At 424 light years, within the limits of the constellation of Sagittarius and at the edge of the Southern Crown is the molecular cloud of Corona Australis, in which we find several magnificent nebulae by reflection (dust clouds reflecting the light of neighboring stars) and several dark nebulae (clouds of gas and dust that do not receive not enough light from any nearby star and present themselves as dark and mask the stars behind).

NGC 6726/6727 and IC 4812 are blue reflection nebulae, NGC 6729 is a butterfly-shaped object acting in emission/reflection around an irregular variable star R Coronae Australis (R CrA) discovered in 1866 with a magnitude varying from 9.7 to 13.5. This star is so hot that it causes the ionization of the gas present which therefore emits light. Be 157 original is a little and faint reflexion nebula.

There are also herbig-haro objects, the most visible of which in the image are HH98,99, 100, 101 and 104. These are small clouds associated with some very young stars, which form when matter ejected by these nascent stars collides with the surrounding clouds of gas and dust, at speeds of several hundred kilometers per second. Herbig-Haro objects are ubiquitous in regions of stellar formation, and often it is possible to observe several around the same star, aligned along its axis of rotation.

They are seen as delicate little arcs of luminous gas. All in a set of dark nebulae: SL 39, SL 41, Be 158 and part of the large Be 157. In addition, in the top right corner shines the globular cluster NGC 6723 of magnitude 6 to 6.8 of class VII consisting of stars of magnitude 14 and less.

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IC 4812 & NGC 6726/27, 



    
        

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