Corona Australis nebula

Observational Data
Designation |  NGC 6729
Right ascension |  31h 01m 46.1s[1]
Declination |  -36° 57′ 40″[1]
Constellation |  Corona Australis
Type of object |  Reflection nebula
Dimensions |  1°
Astrometry
Distance from Earth |  420 ly[2]

The Corona Australis nebula is a reflection nebula in the constellation of Corona Australis.[3] The nebula is designated NGC 6729 in the New General Catalogue and is associated with two nearby nebulae, NGC 6726 and NGC 6727. Discovered in 1861 by Johann Friedrich Julius Schmidt in Athens, the nebula is known to contain several variable stars and Herbig-Haro objects.[4][5]

## Properties and Structure[edit]

The nebula is situated some 420 light years from Earth.[4] It has an apparent angular size of about 1 degree (12 times larger that a full Moon) or 9 light years across. The nebula contains gas as well as several clusters of stars, one example being the globular cluster NGC 6541.[6] There is a large dust lane found in the vicinity of the nebula.

The nebula contains many Herbig–Haro objects.[7] The material ejected from stars within the nebula slams into the gas and dust that surrounds them. Travelling at speeds up to 1,000,000 kilometres per hour, the resulting shockwaves cause the gas to glow. This creates strange arcs and streaks of glowing gas and these are Herbig–Haro objects.

## References[edit]

1. ↑ 1.0 1.1 NGC 6729 from the SIMBAD Astronomical Database
2. ↑ Neuhauser, R. and Forbrich, J. (2018). The Corona Australis Star Forming Region. [online] Arxiv.org. Available at: arXiv:0808.3374 [Accessed 8 June 2018].
3. ↑ Corona Australis from constellation-guide.com
4. ↑ 4.0 4.1 Stars and Dust in Corona Australis from apod.nasa.gov
5. ↑ Knox Shaw, H. (1916). Note on the Variable Nebula in Corona Australis. Monthly Notices of the Royal Astronomical Society, 76(8), pp.646-647. Online
6. ↑ Corona Australis constellation from universetoday.com
7. ↑ NGC 6729 from eso.org

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Nebula

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Barnard's loop · Bubble nebula · Bubble nebula in Barnard's galaxy · California nebula · Cave nebula · Corona Australis nebula · Cone Nebula · Crescent nebula · Double Helix nebula · Eagle nebula · Elephant's Trunk nebula · Eta Carinae nebula · Flame nebula · Gum nebula · Heart nebula · Lagoon nebula · North America Nebula · Omega nebula · Orion nebula · Pistol nebula · Rosette nebula · Soul nebula · Tarantula nebula · Trifid nebula · Witch head nebula

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Protoplanetary nebulae|

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Dark nebulae|

Coalsack nebula · Dark horse nebula · E nebula · Horsehead nebula · Pipe nebula · Snake nebula

Herbig–Haro objects|

HH32 · HH47

Supernova remnants|

Cassiopeia A · Crab nebula · Sagittarius A East · Veil nebula · Vela supernova · SN G1.9+0.3 · SN 1572 · SN 1604