NGC 7538

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NGC 7538
Diffuse nebula
NGC 7538.jpg
NGC 7538
[SII] = Red, = Green, [OIII] = Blue
Observation data: J2000.0 epoch
Subtype emission or reflection
Right ascension 23h 13m 45.7s[1]
Declination +61° 28′ 21″[1]
Distance 9,100[2] ly   (2,800 pc)
Apparent dimensions (V) 9′.00 × 6′.0
Constellation Cepheus
Notable features Contains largest known protostar
Designations Bubble Nebula, Dreyer's Object, Sharpless 158
See also: Lists of nebulae

NGC 7538, near the more famous Bubble Nebula, is located in the constellation Cepheus. It is located about 9,100 light-years from Earth. It is home to the biggest yet discovered protostar which is about 300 times the size of the Solar System. It is located in the Perseus Spiral Arm of the Milky Way and is probably part of the Cassiopeia OB2 complex.[2] It is a region of active star formation including several luminous near-IR and far-IR sources.[2]


  1. ^ a b "SIMBAD Astronomical Database". Results for NGC 7538. Retrieved 2006-10-20. 
  2. ^ a b c Balog, Z.; Kenyon, S. J.; Lada, E. A.; Barsony, M.; et al. (2004). "A Near-Infrared (JHK) Survey of the Vicinity of the H II Region NGC 7538: Evidence for a Young Embedded Cluster". The Astronomical Journal. 128 (6): 2942–2953. arXiv:astro-ph/0409115Freely accessible. Bibcode:2004AJ....128.2942B. doi:10.1086/425548. 
Map showing location of NGC 7538 (Roberto Mura)