Note: this is an archived version which has been superseded. The current SNR catalogue is at http://www.mrao.cam.ac.uk/surveys/snrs/

G57.2+0.8     (4C21.53)

• Right Ascension: 19 34 59
• Declination: +21 57
• Size (/arcmin): 12?
• Type: S?
• Flux density at 1 GHz (/Jy): 1.8
• Spectral Index: 0.62

Radio: Extended non-thermal arc.

Point sources: Near the millisecond pulsar, but not thought to be related.

References:

• Sieber & Seiradakis 1984, A&A, 130, 257. Effelsberg 100-m at 1.4 GHz (8'.8: 1.34±0.1), 2.7 GHz (4'.3: 0.86±0.1), plus other surveys of the area. ADS
• Caswell et al. 1985, AJ, 90, 488. DRAO at 1.4 GHz (1'×3'). ADS
• Hurley-Walker et al. 2009, MNRAS, 396, 365. Radio observations at 14 to 18 GHz. ADS
• Sun et al. 2011, A&A, 536, A83. Urumqi 25-m at 5 GHz (9'.5: S=0.74±0.04 Jy) including polarisation and review of flux densities. ADS

Last updated: 24 May 2014