SN 2021hpr
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 | |
| Event type | SN Ia |
|---|---|
| Date | April 2, 2021 |
| Constellation | Draco |
| Right ascension | 10h 16m 38.620s[1] |
| Declination | +73° 24′ 01.80″[1] |
| Epoch | J2000 |
| Distance | 45 Mpc |
| Host | NGC 3147 |
| Progenitor | Binary star |
| Peak apparent magnitude | 13.8[2] |
SN 2021hpr was a type Ia supernova located in the Constellation of Draco that occurred in the spiral galaxy NGC 3147 at a distance of about 45 Mpc.[3] Its discovery was reported by amateur astronomer Kōichi Itagaki on April 2, 2021.[4] The progenitor of this supernova was likely a star in a binary star system with a separation of ~15.84 AU.[5]
The expanding fireball produced by this supernova was homogeneous. This is likely due to the supernova ejecta interacting with its companion object and the surrounding circumstellar medium (CSM). The circumstellar medium was metal rich.[5][7]