SSTGFLS J222557+601148 explained

SSTGFLS J222557+601148
Type:	PLANETARY
Epoch:	J2000.0
Constellation:	Cepheus
Ra:	^[1]
Dist Pc:	2000–3000^[2]
Notes:	Originally misclassified as a supernova remnant
Names:	EQ J222557+601158

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]

Notes and References

1. 10.1086/503669 . 2006ApJ...640L.179M . 640 . Tentative Discovery of a New Supernova Remnant in Cepheus: Unveiling an Elusive Shell in the Spitzer Galactic First Look Survey . The Astrophysical Journal . 2006 . L179–L182. astro-ph/0602552 . Morris . Patrick W. . Stolovy . Susan . Wachter . Stefanie . Noriega-Crespo . Alberto . Pannuti . Thomas G. . Hoard . D. W. . 2 . 17002674 .
2. 10.1088/0004-6256/139/6/2595 . 2010AJ....139.2595F . 139 . The Nature of the Strong 24 micron Spitzer Source J222557+601148: Not a Young Galactic Supernova Remnant . The Astronomical Journal . 2595–2599. 1004.3293 . Fesen . Robert . Milisavljevic . Dan . 2010 . 6 . 119186785 .