SSTGFLS J222557+601148

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SSTGFLS J222557+601148
Emission nebula
Planetary nebula
Observation data: J2000.0 epoch
Right ascension 22h 25m 57s[1]
Declination 60° 11.8′[1]
Distance 2000–3000[2] pc
Constellation Cepheus
Notable features Originally misclassified as a supernova remnant[2]
Designations EQ J222557+601158
See also: Lists of nebulae

SSTGFLS J222557+601148 is a planetary nebula in the constellation Cepheus. Located between 2000 and 3000 parsecs distant from Earth, it was originally classified in 2006 as a supernova remnant. Thought to be the first supernova remnant first detected in the infrared wavelengths,[1] the spectrum and properties of the object did not match up well with that of a typical supernova remnant, and it was reclassified as a planetary nebula in 2010. A candidate central star has been identified, with an apparent infrared magnitude of 22.4.[2]


  1. ^ a b c "Tentative Discovery of a New Supernova Remnant in Cepheus: Unveiling an Elusive Shell in the Spitzer Galactic First Look Survey". The Astrophysical Journal. 640: L179–L182. arXiv:astro-ph/0602552Freely accessible. Bibcode:2006ApJ...640L.179M. doi:10.1086/503669. 
  2. ^ a b c "THE NATURE OF THE STRONG 24 μm SPITZER SOURCE J222557+601148: NOT A YOUNG GALACTIC SUPERNOVA REMNANT". The Astronomical Journal. 139: 2595–2599. arXiv:1004.3293Freely accessible. Bibcode:2010AJ....139.2595F. doi:10.1088/0004-6256/139/6/2595.