Caldwell 19. Cocoon Nebula -- Stellar Nursery
Captured 1 Nov 20, 22:15 hrs ET, Springfield, VA, USA. Bortle 8 skies, MallinCam DS10c camera, 10 inch SCT f6, E 30 sec, gain 60, bin 1, stack 20, LeNhance filter.
Clouds: partly cloudy
Seeing: 30
Transparency: 30
FOV: 37 x 28 arcmin
Moon phase: 100%
Apparent magnitude: +10
Size: 20 arcmin
Surface brightness: 16.2 magnitudes per square arcmin
Appearance: oblong red 'lumpy' nebulosity, with bright star near center.
Note: intermittent star trailing due to wind gusts buffeting the scope during live stacking.
from Wikipedia
IC 5146 (also Caldwell 19, Sh 2-125, and the Cocoon Nebula) is a reflection/emission nebula in the constellation Cygnus. The NGC description refers to IC 5146 as a cluster of 9.5 mag stars involved in a bright and dark nebula. The cluster is also known as Collinder 470. It is located near the naked-eye star Pi Cygni, the open cluster NGC 7209 in Lacerta, and the bright open cluster M39. The cluster is about 4,000 ly away, and the central star that lights it formed about 100,000 years ago. The nebula is about 12 arcmins across, which is equivalent to a span of 15 light years.
When viewing IC 5146, dark nebula Barnard 168 (B168) forms the dark lane that surrounds the cluster and projects westward forming a 'tail' behind the Cocoon.
IC 5146 is a stellar nursery where star-formation is ongoing. Observations by both the Spitzer Space Telescope and the Chandra X-ray Observatory have collectively identified hundreds of young stellar objects. Young stars are seen in both the emission nebula, where gas has been ionized by massive young stars, and in the infrared-dark molecular cloud that forms the "tail". The most-massive star in the region is BD +46 3474, a star of class B1 that is an estimated 14±4 times the mass of the sun.
Another interesting star in the nebula is BD +46 3471, which is an example of a HAeBe star, an intermediate mass star with strong emission lines in its spectrum.
Caldwell 19. Cocoon Nebula -- Stellar Nursery
Captured 1 Nov 20, 22:15 hrs ET, Springfield, VA, USA. Bortle 8 skies, MallinCam DS10c camera, 10 inch SCT f6, E 30 sec, gain 60, bin 1, stack 20, LeNhance filter.
Clouds: partly cloudy
Seeing: 30
Transparency: 30
FOV: 37 x 28 arcmin
Moon phase: 100%
Apparent magnitude: +10
Size: 20 arcmin
Surface brightness: 16.2 magnitudes per square arcmin
Appearance: oblong red 'lumpy' nebulosity, with bright star near center.
Note: intermittent star trailing due to wind gusts buffeting the scope during live stacking.
from Wikipedia
IC 5146 (also Caldwell 19, Sh 2-125, and the Cocoon Nebula) is a reflection/emission nebula in the constellation Cygnus. The NGC description refers to IC 5146 as a cluster of 9.5 mag stars involved in a bright and dark nebula. The cluster is also known as Collinder 470. It is located near the naked-eye star Pi Cygni, the open cluster NGC 7209 in Lacerta, and the bright open cluster M39. The cluster is about 4,000 ly away, and the central star that lights it formed about 100,000 years ago. The nebula is about 12 arcmins across, which is equivalent to a span of 15 light years.
When viewing IC 5146, dark nebula Barnard 168 (B168) forms the dark lane that surrounds the cluster and projects westward forming a 'tail' behind the Cocoon.
IC 5146 is a stellar nursery where star-formation is ongoing. Observations by both the Spitzer Space Telescope and the Chandra X-ray Observatory have collectively identified hundreds of young stellar objects. Young stars are seen in both the emission nebula, where gas has been ionized by massive young stars, and in the infrared-dark molecular cloud that forms the "tail". The most-massive star in the region is BD +46 3474, a star of class B1 that is an estimated 14±4 times the mass of the sun.
Another interesting star in the nebula is BD +46 3471, which is an example of a HAeBe star, an intermediate mass star with strong emission lines in its spectrum.