G89.0+4.7

HB21

Radio: Distorted shell (4C50.52, an extragalactic double, is within the boundary of the remnant).
Optical: Filaments and patches.
X-ray: Centrally brightened.
Distance: Various associations imply 0.8 kpc.

References:

Last updated: 13 May 2017


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Dave Green/Cambridge, UK/