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Hello, sn type II discovered the 2024-03-02. See discovery report here : https://www.wis-tns.org/object/2024drt/discovery-cert H alpha and H epsilon redshifted show z of about 0.024 spectrum taken with an alpy 200 on a Newton 300 f/4 Data Process with Isis. Star ref is hd 113697 sn2024drt_png.png Ch...

Hello,

Here is a spectrum taken last night with the new Alpy 200 spectrograph.
47 days after first detection, sn2024bch develops strong broad Balmer lines due to the very high ejection velocities (mesured at about 8000 km/s)
P cygni profil not yet visible.

Cheers
Emmanuel

If it is, it should develop strong broad Balmer P Cygni lines like here
https://britastro.org/observations/obse ... 4d96087a30

Excellent reason to continue observations.

Hello,
Here is a spectrum taken last night. Despite the very low signal noise ratio, we can see a wide line in emission around 4680 A and a short Ha line slighty redshifted. More exposure is required asap. Possible sn type II.
Poor weather conditions : fog and few high level clouds
Cheers
Emmanuel

Hi Juan José,

Input beam focal ratio of Alpy 600 is f/4. So, this spectrograph is fully suitable to work with a f/4 telescope and needs no additional optics that can introduce chromatism.

Regards

Emmanuel

Hello Robin
nice target. Waiting for better weather condition.
Emmanuel

I'm also agree with you and Olivier. Redshift=0 does not coincide with a distant galaxy. Good point, I will complete the information in the TNS. I am currently pointing this object in order to check if there are changes in the spectrum. I hope that weather remains ok. Looking for the DSS. Thank you ...

Hello, the survey of 1.2m of Mount Palomar detected an transient of m=13.5 in the constellation of the Dragon on April 16. At present time, no classification has been given. However, the position of this event seems to be associated with a galaxy of m=21 and would suggest a possible supernovae. sn20...

Hello, sn 2023eoc appeared in the constellation of the dragon and taked with a Newton 0.3 m and Alpy 600. When it was discovered on April 4, it had a magnitude of 17.4 (z=0.036). It is given for 16.3 today. Host galaxy is anonymous (possible CGCG275-028) sn2023eoc_f.png See the comparing spectrum wi...

Hello,
here is an Ia type supernova (m~16) in LEDA 83768 taken the 20230412 with a Newton 300 f/4 and Alpy 600 spectrograph.
Regards
Emmanuel