› Forums › Deep Sky › Transient 2018bsr › Transient 2018bsr
20 May 2018 at 9:58 pm
#579513
![](https://britastro.org/wp-content/uploads/2016/11/picture-146-1478110706-80x80.jpg)
Participant
Hi David,
From the sharp H alpha emission line in the spectrum (from the host galaxy) the redshift = ~0.04 which corresponds to ~170MPc distance. The spectrum is clearly a type 1a. At this distance a type 1a SN would reach ~16.9 at maximum, not allowing for any redenning. The ASAS-SN mag 17.2 does seem rather bright for 9-12 days before maximum but ages estimated from the spectra can be notoriously unreliable so it could be closer to maximum than this
Robin