Note: this is an archived version which has been superseded.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

G39.7-2.0 W50, SS433

Notes: Eastern part has been called G40.0-3.1. Is this a SNR?

Radio: Elongated shell, containing SS433, adjacent to the HII region S74.
Optical: Faint filaments at the edge of the radio emission.
X-ray: Emission from SS433 and two lobes.
Point sources: SS433 is the compact source in the centre of the W50.
Distance: Distance to SS433 is 5 kpc.


Last updated: 1 Aug 2000

Dave Green/MRAO, Cambridge, UK/