|Observation data: J2000.0 epoch|
|Right ascension||22h 25m 57s|
|Notable features||Originally misclassified as a supernova remnant|
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, 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.
- "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: . Bibcode:2006ApJ...640L.179M. doi:10.1086/503669.
- "THE NATURE OF THE STRONG 24 μm SPITZER SOURCE J222557+601148: NOT A YOUNG GALACTIC SUPERNOVA REMNANT". The Astronomical Journal. 139: 2595–2599. arXiv: . Bibcode:2010AJ....139.2595F. doi:10.1088/0004-6256/139/6/2595.
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