IC443, 3C157

Radio: Limb-brightened to NE, with faint extension to the E.
Optical: Brightest to the NE, with faint filaments outside the NE boundary.
X-ray: Shell, brightest to the NE, plus compact source with nebula.
Point sources: X-ray source and nebula in S.
Distance: Mean optical velocity suggests 0.7–1.5 kpc, association with S249 gives 1.5–2 kpc.


Last updated: 16 Jun 2017

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Dave Green/Cambridge, UK/