SN2024ggi in NGC 3621

[Cyberman (Rob)]

Hello everyone,
Does anyone still do spectroscopy. There is a young type 2 SN2024ggi in NGC 3621. I thought this would be a good target. Would be interested to see your results, Rob

[Rob_K]

Mag 12 is a bit too faint for me unfortunately. Hoping to get a spectrum of comet 12P/Pons-Brooks after the Moon moves back. Thanks for the heads-up!

Cheers -

[bojan]

Yep, possibly too dark for spectroscopy...
I may try next weekend with my contraption (based on SA100), long exposure and relying on the RA drift (Moon rate), but I doubt it will be of any use, especially because of relatively crowded star field.

Attached image is a stack 64x15 sec @ISO6400, C11 _FR.63, L-Pro, Canon 60D(a).

[Cyberman (Rob)]

If you get any data Bojan, please post it. I saw some interesting spectroscopy of this on Transient name server showing it to be a SN type2 with interesting H spikes. Rob

[bojan]

I tried the spectrum tonight...
As suspected, SN is maybe too dim to pop out of background LP.

Maybe I should stack couple of tens of frames to improve S/N ratio and stretch the histogram a bit.
Also, without FR the background glow will be 3x lower.. possibly enough for spectrum to dominate.

This is crop from single frame, 2 minutes @ISO1600 (C11+FR+SA100+Canon 450D(modded)).

[bojan]

This is 64x30 sec stack, Canon 60Da, ISO 6400, at C11 prime focus.

Spectrum is not calibrated, but the emission in near IR (hump to the right) is clearly visible.... is it FeXXV ?

[bojan]

Calibrated spectrum [I hope (wavelengths-wise).. eta Car used as standard]

[Cyberman (Rob)]

That's great work Bojan. I don't know anything about spectroscopy. Can you interpret it for me. I suspect the spectroscopy will change as the SN evolves then dims. Rob

[Rob_K]

Originally Posted by bojan

Calibrated spectrum [I hope (wavelengths-wise).. eta Car used as standard]

Nice job Bojan!

Cheers -