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Title: Corona Australis HDR

Description: Close to the galactic center of the Milky Way, next to Sagittarius, we find this amazing area in the Corona Australis constellation. Full of cosmic dust clouds, this area shows a rich field of stars, with several hidden gems across the field, such as several tiny galaxies hidden behind the main scene.


With a blueish color we can see a reflection nebulae group catalogued as NGC 6726, 6727, 6729 and IC 4812. The characteristic blue color is produced as the light from hot stars is reflected by the cosmic gas. The dust also obscures from view stars in the region still in the process of formation. Smaller yellowish nebula NGC 6729 surrounds the young variable star R Coronae Australis.

This star scape also includes the amazing NGC 6723 globular star cluster, that lies some 30,000 light-years away, further away than the denser clouds of this region, that are found some 500 light-years away from us and that block light from more distant background stars.

I captured this image with my portable telescope on my last trip to Tivoli Astrofarm, Namibia, last September 2022. It was a memorable trip that I'll never forget.

A special mention to Astronomy Picture of the Day for its excellent page that helped me to document the text above.

Image details:

L: 45x300" (3h45')RGB: 20 x 60" each channel (1h) Calibrated with darks, flats. dark-flats.

Total exposure: 4h 45'

Moon at 4%
Sky darkness: 22,05 mag/arcsec2
Image resolution: 2.59”/pixel
FOV (full image): 4º26' x 2º56'

Equipment:

FRA300 + ASI2600MM + LRGB ZWO filters + ZWO EFW 7 pos + ZWO EAFZWO AM5 mountASI AIR PlusGuiding with ASI120MM and ZWO Mini Guide Scope

Aleix Roig, April 2023.Tivoli Astrofarm (Namibia).

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This image is a revision of the original work with a better processing for the bright areas. I have applied an HDR using the short R,G,B exposures that allowed me to recover several super bright details.

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