Emission nebula in the constellation Ara
NGC 6164, known as theDragon's Egg Nebula, [ 1] [ 2] emission nebula located in the constellationNorma . The nebula was discovered byastronomer John Herschel on the 1st of July 1834,[ 3] [ 4] light years from theSolar System .
Its shape gives it the appearance of a planetary nebula resulting from the death of an old star similar to the Sun, but it is in reality an emission nebula. The gas from this nebula was ejected by the star located at its center, and this is also the source of its energy. In theHenry Draper Catalogue , this star is designated asHD 148937 .[ 5] [ 6] O-type star whose age is between three and four million years.[ 7] [ 8] [ 9] [ 10] Sun , and is expected to end its life on themain sequence in three to four million years.[ 8]
^ information@eso.org."The nebula NGC 6164/6165 in the constellation of Norma" .www.eso.org . Retrieved2024-07-25 . ^ Starr, Michelle (2024-04-11)."Enigmatic 'Dragon's Egg' Star Is a Magnetic Monster And We Finally Know Why" .ScienceAlert . Retrieved2024-07-25 . ^ Herschel, John Frederick William (1847)."Results of astronomical observations made during the years 1834, 5, 6, 7, 8, at the Cape of Good Hope; being the completion of a telescopic survey of the whole surface of the visible heavens, commenced in 1825" .London . ^ Herschel, John F. W. (John Frederick William); United States Military Academy, former owner DSI (1847).Results of astronomical observations made during the years 1834, 5, 6, 7, 8, at the Cape of Good Hope : being the completion of a telescopic survey of the whole surface of the visible heavens, commenced in 1825 ^ info@noirlab.edu."Nebula NGC 6164-5" .www.noirlab.edu . Retrieved2024-07-25 . ^ Henize, Karl G. (1959-01-01)."A new planetary nebula NGC 6164-65 (Cederblad 135a, b)" .The Astronomical Journal .64 : 51.Bibcode :1959AJ.....64S..51H .doi :10.1086/108043 .ISSN 0004-6256 . ^ "A Halo for NGC 6164" .www.as.arizona.edu . Retrieved2024-07-25 .^a b "APOD: 2014 May 22 - A Halo for NGC 6164" .apod.nasa.gov . Retrieved2024-07-25 .^ Lim, Beomdu; Naze, Yael; Chang, Seok-Jun; Hutsemekers, Damien (2023-12-05)."A Morpho-Kinematic Study of the Enigmatic Emission Nebula NGC 6164/5 Surrounding the Magnetic O-type Star HD 148937" .The Astrophysical Journal .961 (1): 72.arXiv :2312.03211 Bibcode :2024ApJ...961...72L .doi :10.3847/1538-4357/ad12c4 ^ Wade, G. A.; Grunhut, J.; Gräfener, G.; Howarth, I. D.; Martins, F.; Petit, V.; Vink, J. S.; Bagnulo, S.; Folsom, C. P.; Nazé, Y.; Walborn, N. R.; Townsend, R. H. D.; Evans, C. J. (2012-01-01)."The spectral variability and magnetic field characteristics of the Of?p star HD 148937" .Monthly Notices of the Royal Astronomical Society .419 (3):2459– 2471.arXiv :1108.4847 Bibcode :2012MNRAS.419.2459W .doi :10.1111/j.1365-2966.2011.19897.x ISSN 0035-8711 .
