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Cassiopeia A
First Light
Cas A is the remnant of a star that exploded about 300 years ago. The X-ray image
shows an expanding shell of hot gas produced by the
explosion. This gaseous shell is about 10 light years in
diameter, and has a temperature of about 50 million
degrees.
| Fast Facts for Cassiopeia A: |
| Credit |
NASA/CXC/SAO |
| Scale |
Image is 6 arcmin on a side. |
| Category |
Supernovas & Supernova Remnants |
| Coordinates (J2000) |
RA 23h 23m 26s | Dec +58º 8' 53.4" |
| Constellation |
Cassiopeia |
| Observation Dates |
August 19, 1999
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| Observation Time |
1 hour |
| Obs. IDs |
214
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| Color Code |
Intensity |
| Instrument |
ACIS |
| Also Known As | Cas A |
| Distance Estimate |
10,000 light years |
| Release Date |
August 26, 1999 |
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