G1.9+0.3
G1.9+0.3 is a supernova remnant (SNR) in the constellation of Sagittarius. It is the youngest-known SNR in the Milky Way, resulting from an explosion the light from which would have reached Earth some time between 1890 and 1908. The explosion was not seen from Earth as it was obscured by the dense gas and dust of the Galactic Center, where it occurred. The remnant's young age was established by combining data from NASA's Chandra X-ray Observatory and the VLA radio observatory. It was a type Ia supernova. The remnant has a radius of over 1.3 light-years.
| Event type | Supernova remnant |
|---|---|
| Date | 1985 |
| Right ascension | 17h 48m 45.4s |
| Declination | −27° 10′ 06″ |
| Distance | 27,700 ly (8,500 pc) |
| Other designations | NVSS J174846-270950, F3R 101, RFS 24, [SKM2002] 41, [SKM2002] G001.9+0.3, [ADP79] 001.873+0.323, MGPS J174846-270950 |
| Preceded by | SN 1604 (observed), Cassiopeia A (unobserved, c. 1680) |
| Followed by | SN 1885A |
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