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The Coalsack Nebula (Southern Coalsack, or simply the Coalsack) [3] is a dark nebula, which is visible to the naked eye as a dark patch obscuring part of the Milky Way east of Acrux (Alpha Crucis) in the constellation of Crux.
Crux also contains the bright and colourful open cluster known as the Jewel Box (NGC 4755) on its eastern border. Nearby to the southeast is a large dark nebula spanning 7° by 5° known as the Coalsack Nebula, portions of which are mapped in the neighbouring constellations of Centaurus and Musca.
NGC 4609 (also known as Caldwell 98) is an open cluster of stars in the southern constellation of Crux. It was discovered on May 12, 1826 by the Scottish astronomer James Dunlop. [4] The cluster has an apparent visual magnitude of 6.9 [2] and spans an angular size of 6.5′. [1]
HD 110432 is a Be star in the south-east of Crux, behind the center of the southern hemisphere's dark Coalsack Nebula. It has a stellar classification of B1IVe, which means it is a subgiant star of class B that displays emission lines in its spectrum.
The Coalsack Nebula is a dark nebula in the constellation of Crux Australis.Dark nebulae consist of cold dense clouds of gas and dust, which are only seen because they obscure visible light from more distant objects.
Crux: 6.9 C99 - Coalsack Nebula: Dark Nebula: 0.61 Crux - C100 IC 2944: Lambda Centauri Nebula: Open Cluster and Nebula: 6 Centaurus: 4.5 C101 NGC 6744 Spiral Galaxy: 34,000 Pavo: 9 C102 IC 2602: Theta Car Cluster: Open Cluster: 0.492 Carina: 1.9 C103 NGC 2070: Tarantula Nebula: Open Cluster and Nebula: 170 Dorado: 8.2 C104 NGC 362 Globular ...
HD 106906 is a binary star [6] system in the southern constellation of Crux. It is too faint to be visible to the naked eye, having a combined apparent visual magnitude of 7.80. [2] The distance to this system is approximately 337 light years based on parallax, and it is receding from the Sun with a radial velocity of +10 km/s. [2]
It lies in the small southern constellation of Crux, halfway between η Crucis and ζ Crucis and close to the constellation's brightest star α Crucis. This area of sky lies within the Milky Way and close to the Coalsack Nebula .