11/18/2023 0 Comments Hubble reflection nebulaThe Cocoon Nebula lies in the same area of the sky as Deneb and the open cluster Messier 39. These are found both in the emission nebula, where they ionize the surrounding gas, and in the dark patch of nebulosity in the western part of the Cocoon. In 2008, infrared observations with the Spitzer Space Telescope identified more than 200 young stellar objects in the region of the Cocoon Nebula. It stretches from the Cocoon Nebula in the direction of the bright open cluster Messier 39.Ī 2018 study exploring the internal kinematics of young clusters with ages from 1 to 5 million years identified 115 members of IC 5146, located at a distance of 758 to 809 parsecs (2,472 to 2,639 light years). The dark nebula is catalogued as Barnard 168 (B168). The western part of the nebula is intersected by a dark lane that winds around the young cluster. The shape of the Cocoon Nebula has been explained as the result of BD +46☃474 having formed near the surface of the cloud and carved a cavity out of which nebular material is flowing in our direction. The estimated median age of these stars is around 1 million years.Ĭocoon Nebula (IC 5146), image: Adam Block/Mount Lemmon Sk圜enter/University of Arizona (CC BY-SA 3.0 US) Both stars are surrounded by clusters of young stars. BD +46☃471 lies about 10 arcminutes west of BD +46☃474. They show variability in brightness due to planetesimals in the circumstellar disks. HAeBe (Herbig Ae/Be) stars are A- and B-type pre-main sequence stars that are still embedded in clouds of dust and gas and may have circumstellar disks. One of the star’s neighbours, catalogued as BD +46☃471, has been identified as a HAeBe variable. The star has a mass of 14 ± 4 solar masses and is believed to be only 100,000 years old. A 2002 study identified it as the most massive member of IC 5146. It was reported to be a close binary system in 1987 and may even be a multiple star system. The star is enveloped in a molecular cloud at the eastern end of a dark lane spanning 2 degrees. The Cocoon Nebula is illuminated by BD +46☃474, a hot young main sequence star of the spectral type B0 V or B1 V. Also catalogued as Sh 2-125 and Caldwell 19, the nebula is an active star-forming region associated with the young open cluster Collinder 470. With an apparent magnitude of 7.2 and an apparent size of 12 arcminutes, it can be observed in amateur telescopes. The Cocoon Nebula (IC 5146) is a reflection/emission nebula located approximately 2,500 light years away in the constellation Cygnus.
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