Russell Croman Astrophotography  



The Dumbbell Nebula

About This Photograph

It is somewhat ironic that the deaths of stars can be some of the most beautiful spectacles in the sky. Here we see the Dumbbell Nebula, the remains of a star not unlike our sun, its outer layers flung off into space and illuminated by the hot but fading ember of the original star. This remnant appears here as the small, blue star at the center of the nebula. Having run out of hydrogen "fuel," it shines only by the heat leftover from its life as a true star. Over a period of thousands of years, the nebula will expand and dissipate, and the stellar remnant will cool and fade from visibility.


Technical Details

Optics:14" f/10 RCOS Ritchey-Chr├ętien Cassegrain
Camera:SBIG ST-10XME, CFW-8.
Mount:Takahashi NJP Temma 2.
Filters:SBIG standard LRGB
Custom Scientific 3nm H-alpha
Custom Scientific 3nm O-III.
Dates/Times:30 June 2003, 14, 29, 30 July, 3 August 2003.
Location:my backyard observatory in Austin, Texas.
Exposure Details:LRGB = 60:30:15:30 minutes
Ha = 200 minutes
O-III = 140 minutes.
Processing:This is an enhanced natural color image: H-alpha and O-III data were blended with the original clear-filtered data to form a new luminance channel. This allowed a less aggressive DDP on the clear-filtered data, so the star images are much tighter


Publication Data for this Photograph

Date Publication Type
2006-11-00 The NewAstro Zone System for Astro Imaging,
p. 227