The Tarantula Nebula

The Tarantula Nebula (also known as 30 Doradus, or NGC 2070) is an H II region in the Large Magellanic Cloud (LMC). It was originally thought to be a star, but in 1751 Nicolas Louis de Lacaille recognized its nebular nature.

The Tarantula Nebula has an apparent magnitude of 8. Considering its distance of about 49 kpc (160,000 light years), this is an extremely luminous non-stellar object. Its luminosity is so great that if it were as close to Earth as the Orion Nebula, the Tarantula Nebula would cast shadows. In fact, it is the most active starburst region known in the Local Group of galaxies. It is also one of the largest such region in the Local Group with an estimated diameter of 200 pc. The nebula resides on the leading edge of the LMC, where ram pressure stripping, and the compression of the interstellar medium likely resulting from this, is at a maximum. At its core lies the compact star cluster R136 (approximate diameter 35 light years) that produces most of the energy that makes the nebula visible. The estimated mass of the cluster is 450,000 solar masses, suggesting it will likely become a globular cluster in the future.

Imaging telescopes or lenses: Boren-Simon PowerNewt 8
Imaging cameras: QSI 583 wsg
Mounts: Sky-Watcher NEQ6
Guiding telescopes or lenses: Boren-Simon PowerNewt 8
Guiding cameras: Starlight Xpress Lodestar
Focal reducers: Borel-Simon Coma Corrector
Software: Maxim DL, photoshop, Registax, CCDStack, Cartes du Ciel
Filters: Astrodon OIII 5nm, Astrodon SII 5nm, Astrodon H-alpha 5nm
Accessories: Sky-Watcher SW Electric Focuser
Resolution: 3326×2504
Dates: Dec. 10, 2013
Locations: Home
Astrodon H-alpha 5nm: 14×180″ -15C bin 1×1
Astrodon OIII 5nm: 14×300″ -15C bin 1×1
Astrodon SII 5nm: 14×420″ -15C bin 1×1
Integration: 3.5 hours
Darks: ~10
Flats: ~10
Bias: ~10

Autor: Jean-Marie Locci

22 December 2013

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