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NGC 6726/6727 Area in Corona Australis

This high resolution 4-pane mosaic is displaying a unique area of the sky.

NGC 6726 and NGC 6727 - These spectacular reflection nebulae in Corona Australis are the result of a few bright stars caught up in a large, dusty cloud. The peculiar colorful curved streak north of the two bright reflection nebulae surrounds an intriguing object best seen in infrared light. It is R CrA, a young star still accreting interstellar material on to its surface. These compact nebulae are ejected from proto-stars during the later stages of star formation and sometimes appear in pairs, moving in opposite directions from the hidden star-forming region. The R CrA complex is about 500 light years distant, one of the nearest star-forming regions. 

IC 4812 - The two close stars in the reflection nebulaIC4812 are BSO 14 The dense globular cluster NGC 6723 was discovered by James Dunlop in 1826 and cataloged as Dunlop 573. While NGC 6723 appears to be just outside Corona Australis in the constellation Sagittarius, it actually lies nearly 30 000 light-years away, far beyond the Corona Australis dust cloud.  NGC 6729 is a reflection/emission nebula in the constellation Corona Australis located some 424 light-years away. It was discovered by Johann Friedrich Julius Schmidt in 1861.This fan-shaped nebula opens from the star R Coronae Australis toward the star T CrA to the south-east. Bernes 157, a boomerang -shaped dark nebula partly seen in the bottom left corner is 520 light years distant. It stretches around the Corona Australis Nebula like a huge, draping black scarf.

HH 82, 96, 97, 98, 99, 100,101, 104 - High-speed jets of material that travel away from the baby stars at velocities as high as one million kilometres per hour are slamming into the surrounding gas and creating shock waves. These shocks cause the gas to shine and create the strangely coloured glowing arcs and blobs known as Herbig–Haro objects. are narrow jets of gas and matter ejected by young stars at speeds of 100 to 1000 kilometers per second that collide with the surrounding nebula, producing bright shock fronts that glow as the gas is heated by friction while the surrounding gas is excited by the high-energy radiation of nearby hot stars. These objects are transient phenomena, lasting not more than a few thousand years.

Image Data
LRGB (L 12x20m, R 6x20m, G 6x20m, B 6x20m for each of the 4 panels) total 30 h, seeing 0.8-1.3 arcsec, North is up
80cm f/7 Astrooptik Keller cassegrain, FLI Proline 16803, Baader Filters, Prompt 7 CTIO Chile
Processing: Johannes Schedler   APOD on Jan 08, 2015

Find an annotated version here. (with assistance from Sakib Rasool)

Find the mosaic image in 13/50% size below

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Find a crop on the NGC6726/6727 nebula and HH objects in 23/80% size below

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Last modified on Friday, 25 March 2016 08:13

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