G111.7−2.1     Cassiopeia A, 3C461

Notes: Presumably the remnant of a late 17th century SN.

Radio: Bright shell with compact knots and extended plateau of emission.
Optical: Fast knots and quasi-stationary flocculli, with many filaments at large radii, and NE `jet'.
X-ray: Incomplete shell, with hard spectral component.
Point sources: Central compact X-ray source.
Distance: Optical expansion, plus proper motions indicate 3.4 kpc.

References:

Last updated: 30 May 2014


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Dave Green/Cambridge, UK/D.A.Green@mrao.cam.ac.uk