Puppis A (Pup A) is a supernova remnant (SNR) about 100 light-years in diameter and roughly 6,500–7,000 light-years distant. Its apparent angular diameter is about 1 degree. The light of the supernova explosion reached Earth approximately 3,700 years ago. Although it overlaps the Vela supernova remnant, it is four times more distant. A hypervelocity neutron star known as the Cosmic Cannonball has been found in this SNR.
Puppis X-1 Puppis X-1 (Puppis A) was discovered by a Skylark flight in October 1971, viewed for 1 minute with an accuracy ≥ 2 arcseconds, probably at 1M 0821-426, with Puppis A (RA 08h 23m 08.16s Dec -42° 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.
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References
See also List of supernova remnants
External links Media related to Puppis A at Wikimedia Commons
Chandra: Puppis A, date: 10 September 2014, retrieved 4 March 2025 Puppis A: Chandra Reveals Cloud Disrupted By Supernova Shock, Chandra: NASA/CXC/GSFC/U. Hwang et al.; ROSAT: NASA/GSFC/S. Snowden et al., Simbad