another potentially bright supernova 2020hvf in NGC 3643

[Frederic Pastor]

Hi All,

Here is below my spectrum taken yesterday, 12 days after my first "shot". According to the calculation of PRISM, Sn2020hvf should have reached a mag of 12.88. And by comparison with the star just beside (Mag 13.19), Sn2020hvf should be more close than a Mag of 13.

According to Gelato, this spectrum fits well with a Sn1998bu after 9.5 days at Bmax; which is almost the same phase.

Also included, a comparison of my two spectrum.

cheers

Fred

sn2020hvf

Sn2020hvf publication Forum ARAS.jpg (76.97 KiB) Viewed 4238 times

gelato

gelatoplot (1).png (62.75 KiB) Viewed 4238 times

Sn2020hvf comparaison 8 mai 20 mai.jpg (104.48 KiB) Viewed 4238 times

[Daniel Dejean]

Bravo Frédéric,
Sans être un expert compétent, il me semble que l'on distingue une évolution entre tes deux spectres pour la "raie" du silicium SIII 4580 qui est maintenant plus proche (4380) de sa valeur au repos (ralentissement de la vitesse d'expansion ?). Vers 5050 on commence aussi à distinguer nettement ce qui pourrait être la "raie" du FeII 5169,
Très intéressant en tous les cas pour cette SN peu fréquentée.
Bon ciel.

[James Foster]

Here's my try at this rather bright extra galactic SN (Processed in IsisV5.93), shot from home on my CDK17 on 19May20 (in Red)
and shot from Mt. Pinos, CA on 27May20 (purple) with my CC13 (33Cm aperture classical cassegrain):


I may try it again from Pinos this weekend if the weather holds.

James