Cassiopeia A at Dusk

Minimum credit line: Image courtesy of NRAO/AUI and Michael Bietenholz, York University (data courtesy of NRAO and R. Perley)(for details, see Image Use Policy).

About this Image

A radio image of Cassiopeia A, which is a young supernova remnant nearby in our Galaxy, composited with a photograph of the NRAO Very Large Array telescope at dusk. Cassiopeia A is the brightest radio source in the sky except the Sun. It is about 10 light years across and about 10,000 light years away. It is the remnant of a supernova explosion that occurred approximately 300 years ago.

Investigator(s):  Anderson, M., Rudnick, L., Leppik, P., Perley, R., Braun, R.

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Technical Data

    Telescope VLA 
    Date of Observation 1987-07-30 
    Type of Observation Continuum Observations 
    Band L 
    Wavelength 20 cm 
    Frequency 1.4 GHz 
    Center of Image RA: 23:23:24.00, Dec: 58:48:54.00 (J2000)  
    Field of View 0.1083 x 0.1083 degrees  
    Technical Caption The VLA image of Cassiopeia A is courtesy of NRAO and R. Perley, and was made at a frequency of 1.38 GHz using the NRAO Very Large Array. The resolution is 1.3". The brightness scale runs from deep brown through blue to white. In addition, areas where the brightness gradients are steep are highlighted faintly in red. The original radio data was taken from the NRAO CD-ROM: "Images of the Radio Universe", 1992.  

  • Astronomical database entries for Cassiopeia A
    • Query SIMBAD for more Cassiopeia A data


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