Puppis A

{{Short description|Supernova remnant}}

{{Supernova |

| name = Puppis A

| image = Puppis A Chandra + ROSAT.jpg

| caption = The Chandra three-color image (inset) is a region of the supernova remnant Puppis A (wide-angle view from ROSAT in blue) which reveals a cloud being torn apart by a shock wave produced in a supernova explosion. ROSAT image is 88 arcmin across; Chandra image 8 arcmin across. RA 08^h 23^m 08.16^s Dec -42° 41′ 41.40″ in Puppis. Observation date: September 4, 2005. Color code: Energy (Red 0.4-0.7 keV; Green 0.7-1.2 keV; Blue 1.2-10 keV). Instrument: ACIS. Credit: Chandra: NASA/CXC/GSFC/U.Hwang et al.; ROSAT: NASA/GSFC/S.Snowden et al.

| epoch = J2000

| type = S

| host = Milky Way

| constellation = Puppis

| gal = l = 260.2°, b = -3.7°

| ra = 08^h 24^m 07^s

| dec =-42° 59' 48

| discovery = 1971

| iauc =

| mag_v =

| distance = 7,000 ly

| progenitor = Unknown

| progenitor_type = Unknown

| b-v = Unknown

| notes = central source: RX J0822-4300.
Apparent size: 1° }}

Puppis A (Pup A) is a supernova remnant (SNR) about 100 light-years in diameter and roughly 6500–7000 light-years distant.{{cite web

|url= http://wise.ssl.berkeley.edu/gallery_Puppis_A.html

|title=Puppis A

|author=

|date=9 Dec 2011

|website=WISE Multimedia Gallery

|publisher=NASA

|accessdate=21 Nov 2014

}} Its apparent angular diameter is about 1 degree.{{cite journal |last=Milne |first=D. K. |title=Radio observations of the supernova remnants IC443 and Puppis A |date=1971 |journal=Aust. J. Phys. |volume=24 |pages=429 |bibcode=1971AuJPh..24..429M |doi = 10.1071/PH710429 |doi-broken-date=1 November 2024 }} 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.

A hypervelocity neutron star known as the Cosmic Cannonball has been found in this SNR.