bright supernova in M82 (mag 11.7)

[James Long]

I have a skywatcher 90 ....

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[Stu]

I have a skywatcher 90 ....

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Depending on your skies I think you'll struggle unless it does brighten significantly. Last night I just got it in a very good 106mm refractor with the dimmest naked eye star at mag 4.2. If you were under mag 5.5 or better skies you might get it but it's tough for a new observer.

It is predicted to brighten so perhaps it will be easier in a few days or a week. Keep an eye on the forum

Stu

[James Long]

Thanks stu....I will ...just learning the basics just now and enjoying the forum

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[Jack Martin]

Robin,

I am using a 300 grating with my Lhitres III what exposure time do you advise.

Jack

[nytecam]

Here my quickie RO spectrum from tonight in 30s via Lodestar-M on 30cm f/3.3 SCT binned 2x2 and rescaled with 2D profile via AstroArt  - there's a hint of H-alpha for M82 core so maybe 'dip' is Si - more images to stack tomorrow

[robin_astro]

Robin,

I am using a 300 grating with my Lhitres III what exposure time do you advise.

Jack

Hi Jack,

Paolo  used 23 x 6 min exposure for his latest spectrum with the LHIRES and a 150 grating but he was complaining of very poor 6 arcsec seeing 

http://www.spectro-aras.com/forum/viewtopic.php?f=5&t=766

All things being equaly you would need ~ double the exposure for the 300 grating to get the same SNR,  but the exposure will depend on your aperture, focal length, seeing and  the slit width.  

 I think with my LHIRES setup I would use a 35um slit and 10 or perhaps 20 min subs and sum enough to get a good SNR 

Cheers

Robin

[Jack Martin]

Robin,

Thanks for you advice.

Jack

[michael.h.f.wilkinson]

Just got it yesterday evening. Nice sight indeed. Mag 10.5 was my estimate (visual)

[DaveGarland]

Can I ask a quick super nova question?

When the white dwarf reaches its critical mass and goes kaboom, is it fission, fusion or both that drives the kaboom?

[michael.h.f.wilkinson]

As I understand it fusion is the main energy source.For fission to contribute energy, the elements undergoing fission must be heavier than iron, and these elements are rare.

[hippie]

Still haven't had clear sky's to see it yet Hear  ,  Now I just learn of another supernova going of in M99

http://www.disclose.tv/forum/and-another-possible-supernova-in-m99-galaxy-t90828.html

Hoping for clear sky's soon as I'm getting webbed feet & Gazing withdrawal symptoms Hear? .