The oldest recorded supernova observed by humans is SN 185, which was recorded by Chinese astronomers in 185 AD during the Han Dynasty. It’s sometimes also referred to as RCW 86, based on its modern astronomical designation.
Key facts about SN 185:
- Date of observation: 185 AD
- Location: Appeared in the constellation Centaurus
- Duration of visibility: It was visible in the night sky for about 8 months, which is consistent with a supernova.
- Type: Believed to be a Type Ia supernova, though this is still debated.
- Remnant: The modern remnant is known as RCW 86, a large supernova remnant detected in X-ray and radio wavelengths.
Chinese historical records describe it as a “guest star” (a term used for temporary stars, including supernovae), which did not move relative to other stars—unlike a comet—indicating a stellar explosion.