_cleaned_up.jpg) Pa 30 is the supernova remnant of SN 1181. Here the nebula is seen as long thin filaments radiating out from the central star. | |
F  | |
| Date | between August 4 and August 6, 1181 |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 00h 53m 11.2s |
| Declination | +67° 30′ 02.4″ |
| Epoch | J2000 |
| Remnant | Pa 30 |
| Host | Milky Way |
| Notable features | Visible at night for 185 days |
| Peak apparent magnitude | 0? |
| Preceded by | SN 1054 |
| Followed by | SN 1572 |
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First observed between August 4 and August 6, 1181, Chinese and Japanese astronomers recorded the supernova now known as SN 1181 in eight separate texts. One of only five supernovae in the Milky Way confidently identified in pre-telescopic records,[1] it appeared in the constellation Cassiopeia and was visible and motionless against the fixed stars for 185 days. F. R. Stephenson first recognized that the 1181 AD "guest star" must be a supernova, because such a bright transient that lasts for 185 days and does not move in the sky can only be a galactic supernova.[2]
- ^ Stephenson, F. Richard; Green, David (2002). Historical Supernovae and their Remnants. Clarendon Press. ISBN 0-19-850766-6.
- ^ Stephenson, F. Richard (1971). "A Suspected Supernova in A. D. 1181". Quarterly Journal of the Royal Astronomical Society. 12: 10–38. Bibcode:1971QJRAS..12...10S.