X-ray image of the Cosmic Cannonball in Puppis A
|Observation data (Epoch J2000)|
|Host galaxy||Milky Way|
|Right ascension||08h 24m 07s|
|Declination||-42° 59' 48|
|Galactic coordinates||l = 260.2°, b = -3.7°|
|Notable features||central source: RX J0822-4300.
Apparent size: 1°
Puppis A is a supernova remnant (SNR) about 10 light-years in diameter. The supernova 'occurred' (i.e. would have been seen on earth) approximately 3700 years ago. Although it overlaps the Vela Supernova Remnant, it is four times more distant.
Puppis X-1 (Puppis A) was discovered by a Skylark flight in October 1971, viewed for 1 min with an accuracy ≥ 2 arcsec, probably at 1M 0821-426, with Puppis A (RA 08h 23m 08.16s Dec -42º 41' 41.40") as the likely visual counterpart.
Puppis A is one of the brightest X-ray sources in the X-ray sky. Its X-ray designation is 2U 0821-42.
- Wiggin M (December 2000). "The Dome on Ball Hill – The RAE Observatory" (PDF).
- "Puppis A: Chandra Reveals Cloud Disrupted By Supernova Shock", Chandra: NASA/CXC/GSFC/U.Hwang et al.; ROSAT: NASA/GSFC/S.Snowden et al., 
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