Note: this is an archived version which has been superseded. The current SNR catalogue is at

G89.0+4.7 HB21

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


Last updated: 11 Jan 2004

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Dave Green/MRAO, Cambridge, UK/