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L 1157 is a dark nebula in the constellation Cepheus. It was catalogued in 1962 by U.S. astronomer Beverly T. Lynds in her Catalogue of Dark Nebulae, becoming the 1157th entry in the table; hence the designation.[2] The cloud contains an estimated 3,900 Solar masses of material.[1] It includes protostars that are ejecting material in bipolar outflows, forming bow shocks in the surrounding ambient gas. Formamide and HCNO have been detected in these shocked regions, among other compounds.[3]

L 1157
Dark nebula
Observation data: J2000 epoch
Right ascension20h 39.5m [1]
Declination+68° 00.7′[1]
Distance1,400 ly   (440[1] pc)
ConstellationCepheus
See also: Lists of nebulae

References


  1. Kun, M.; et al. (December 2008), Reipurth, Bo (ed.), "Star Forming Regions in Cepheus", Handbook of Star Forming Regions, vol. 1, p. 136, arXiv:0809.4761, Bibcode:2008hsf1.book..136K1
  2. Lynds, Beverly T. (May 1962), "Catalogue of Dark Nebulae", Astrophysical Journal Supplement, 7: 1, Bibcode:1962ApJS....7....1L, doi:10.1086/190072.
  3. Mendoza, Edgar; et al. (November 2014), "Molecules with a peptide link in protostellar shocks: a comprehensive study of L1157", Monthly Notices of the Royal Astronomical Society, 445 (1): 151–161, arXiv:1408.4857, Bibcode:2014MNRAS.445..151M, doi:10.1093/mnras/stu1718.




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