Abstract
We analyze X-ray and radio observations of the supernova remnant G84.2?0.8. 1420?MHz atomic hydrogen (H I) line and radio continuum data yield H I absorption spectra and a new H I absorption distance of 5.8-6.2?kpc. Archival X-ray observations from ROSAT and Chandra which cover the area including G84.2?0.8 are analyzed to show extended X-ray emission from G84.2?0.8. Fits to X-ray spectra from Chandra, with the new H I distance of 5.8-6.2?kpc, are used to determine the Sedov parameters of the supernova remnant. G84.2?0.8 is large (16-18?pc radius), middle aged (~9000?yr), expanding in low-density interstellar medium (0.02?cm?3), and consistent with a low explosion energy (0.8-6.5 ? 1050 erg).
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