Sn 2018 gjx

[Olivier GARDE]

During our mission at Calern Observatory, we have take the spectrum of Sn 2018 gjx with a one meter telescope and a LISA spectrograph with 50 µm slit.

Here's the result with 2 hours exposures (6x1200s)



The auto guiding sensor during acquisitions



And a comparison with a spectrum taken 4 days ago with NTT telescope (not by us...)

[Christian Buil]

Très joli boulot de l'équipe !

et la classe ce télescope... j'arrive

Elle tourne autour de quelle magnitude cette SN au moment de la prise de vue ?

Christian

[Olivier GARDE]

Christian,

Au moment ou l'on a fait le spectre, la magnitude de la Sn devait être dans les 16.
A voir sur :
https://wis-tns.weizmann.ac.il/object/2018gjx

[Robin Leadbeater]

Hi Olivier,

It is interesting that the He II line has disappeared

Are you planning to go any fainter? It could be a good chance to set a new amateur magnitude record for officially classifying a supernova if you can get ~20 SNR in a spectrum filtered to ~40A. (My current limit with the ALPY 200 /C11 is mag 17.5)

Cheers
Robin

[Robin Leadbeater]

at2018gro would be a good one to try for
https://wis-tns.weizmann.ac.il/object/2018gro
It was discovered yesterday in ngc7228 at mag 18.6 by an amateur team led by Dick Post and is probably brightening. It is too faint for me but f you can get it I could try classifying it and could submit it on your behalf if you don't have a TNS account.

Cheers
Robin

[etienne bertrand]

Bravo pour ce résultat !

[Christian Buil]

Un clin d'oeil, car difficile de lutter avec un télescope de 1 m sous le ciel de la Cote d'Azur, cette SN faite la nuit dernière avec le RC de 25 cm et UVEX2 (partie bleu du spectre). Malheureusement, passage de cirrus et puis jolie pollution de la ville (comparer l'aspect de l'image de la SN avec les caméras de guidage du Toulouse et Calern... il y a un monde !) :



A part peut-être vers 4680 A et 4080 A on ne voit pas grand chose avec un tel rapport signal sur bruit (RSB = 4,5), à part l'allure générale du continuum qui indique que l'on a à faire à une type II.

Christian

[Olivier GARDE]

Are you planning to go any fainter? It could be a good chance to set a new amateur magnitude record for officially classifying a supernova if you can get ~20 SNR in a spectrum filtered to ~40A. (My current limit with the ALPY 200 /C11 is mag 17.5)

Cheers
Robin

Hi Robin,

Yes we are planning to go any fainter, but actually, the weather is not find, so we are waiting for a good sky...

[Robin Leadbeater]

at2018gro would be a good one to try for
https://wis-tns.weizmann.ac.il/object/2018gro
It was discovered yesterday in ngc7228 at mag 18.6 by an amateur team led by Dick Post and is probably brightening. It is too faint for me but f you can get it I could try classifying it and could submit it on your behalf if you don't have a TNS account.

Cheers
Robin

now classified as a subluminous type 1a 91bg-like

Robin