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Contains:  NGC 2808
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NGC 2808 Globular Cluster in Carina, 





    
        

            Paulo Cacella
NGC 2808 Globular Cluster in Carina

NGC 2808 Globular Cluster in Carina

Technical card

Imaging telescope or lens:William Optics FLT98

Imaging camera:ZWO ASI 1600MM-Cooled ASI1600

Mount:Sky-Watcher AZEQ6-GT

Guiding telescope or lens:Orion 400mm F/4

Filter:Astrodon RGB

Resolution: 4656x3520

Dates:Feb. 2, 2019

Frames: 3x120"

Integration: 0.1 hours

Avg. Moon age: 27.41 days

Avg. Moon phase: 5.01%

Astrometry.net job: 2503292

RA center: 9h 12' 20"

DEC center: -64° 51' 57"

Pixel scale: 1.270 arcsec/pixel

Orientation: 87.592 degrees

Field radius: 1.030

Locations: DogsHeaven Observatory, Brasilia, DF, Brazil

Data source: Backyard

Description

NGC 2808 is a globular cluster[6] in the constellation Carina. The cluster belongs to the Milky Way, and is one of our home galaxy's most massive clusters, containing more than a million stars. It is estimated to be 12.5-billion years old.

Star Generations
It had been thought that NGC 2808, like typical globular clusters, contains only one generation of stars formed simultaneously from the same material. In 2007, a team of astronomers led by Giampaolo Piotto of the University of Padua in Italy investigated Hubble Space Telescope images of NGC 2808 taken in 2005 and 2006 with Hubble's Advanced Camera for Surveys. Unexpectedly, they found that this cluster is composed of three generations of stars, all born within 200 million years of the formation of the cluster.[7]

Astronomers have argued that globular clusters can produce only one generation of stars, because the radiation from first generation stars would drive the residual gas not consumed in the first star generation phase out of the cluster. However, the great mass of a cluster such as NGC 2808 may suffice to gravitationally counteract the loss of gaseous matter. Thus, a second and a third generation of stars may form.

An alternative explanation for the three star generations of NGC 2808 is that it may actually be the remnant of a dwarf galaxy that collided with the Milky Way, the Sausage Galaxy

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cacella
Paulo Cacella
License: None (All rights reserved)
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NGC 2808 Globular Cluster in Carina, 





    
        

            Paulo Cacella