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 100 lightyears in diameter and roughly 6500–7000 lightyears distant. Its apparent angular diameter is about 1 degree. The light of the supernova explosion reached 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.
- "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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