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Coal Sack and Jewel Box (77mm 5DII) #2.jpg
This is the Coal Sack and Jewel Box Cluster area on the east side of Crux, the Southern Cross. The Coal Sack, which to the eye looks like a large dark patch, under photography breaks up into small patches, the darkest just south of the Jewel Box Cluster, NGC 4755, here just below and left of Becrux, or Beta Crucis at top left.
Other star clusters in the scene are NGC 4852 at top left, Trumpler 20 at right. and NGC 4609 at lower centre. The cluster at far right above Acrux is NGC 4349. The small intensely red object left of centre is the nebula Gum 46. The star at lower right is Acrux, Alpha Crucis.
Technical:
This is a stack of 5 x 8 minute exposures with the Borg 77mm astrographic apo refractor (330mm focal length) at f/4.3 and with the filter-modified Canon 5D Mark II at ISO 800. Taken from Coonabarabran, Australia, March 2014. Reprocessed in 2025.
Other star clusters in the scene are NGC 4852 at top left, Trumpler 20 at right. and NGC 4609 at lower centre. The cluster at far right above Acrux is NGC 4349. The small intensely red object left of centre is the nebula Gum 46. The star at lower right is Acrux, Alpha Crucis.
Technical:
This is a stack of 5 x 8 minute exposures with the Borg 77mm astrographic apo refractor (330mm focal length) at f/4.3 and with the filter-modified Canon 5D Mark II at ISO 800. Taken from Coonabarabran, Australia, March 2014. Reprocessed in 2025.
- Copyright
- © 2014 Alan Dyer
- Image Size
- 5621x3747 / 25.6MB
- www.amazingsky.photoshelter.com
- Contained in galleries
- Star Clusters, Stars, NGC/IC Objects, Nebulas

