11 February 2018 at 2:23 pm #573954Callum PotterKeymaster
With thanks to Owen Brazell for highlighting this via the Webb Society.
There is a bright magnitude 12.7 supernova in NGC 3941 – a barred lenticular galaxy in Ursa Major – 2018pv
More details available on the Rochester supernova site.11 February 2018 at 10:04 pm #579106
Here’s an image of it from a few minutes ago. The telescope wasn’t tracking very well and the SN is very close to the centre of the galaxy but you can see it.12 February 2018 at 11:19 am #579110
Yes, thanks to Owen’s alert I got a visual on it this morning with my driven 24″ Dobsonian and managed a sketch. I had to go up to an 8mm Ethos e/p (x340) to seperate the SN from the core. I found the SN to be brighter than the core. I didn’t see as much of the outer halo as you captured in your image Nick. Skies were excellent with SQM readings of 21.44 in direction of target and a NELM of 5.8 to my old eyes. Seeing about ant III.12 February 2018 at 7:37 pm #579111
Andrew – Nice observation. I guess this is way too faint to see any colour in the SN even with the 24-inch.12 February 2018 at 7:54 pm #579114
No colour seen Nick but I’m never particularly good at detecting colour in DSO’s so doesn’t mean it’s not there to be seen. I’ll have another look tonight, all set up and off out now.
Andrew12 February 2018 at 8:16 pm #579115Robin LeadbeaterParticipant
According to the spectrum on TNS
This is a type Ia and ngc3941 has a distance modulus of mag 30.3 so theoretically it should top out around mag 11. The spectrum shows signs of high extinction from the host galaxy though (strong insterstellar Na line) so probably will struggle to reach that
Robin12 February 2018 at 10:22 pm #579118
I managed to stack 20 x 10s frames. Midpoint of capture 21:09:25 UT. It’s bright! See also the attached png.12 February 2018 at 10:51 pm #579119
In-line image cropped13 February 2018 at 11:42 am #579122
Nick, I did get another visual about 3am this morning with the 24″. Unbelievably conditions were even better than the previous morning with SQM readings of 21.52 and glimpsing M13 N/E. So this time I could split it with a 13mm Ethos (x208) but still much clearer with 8mm (x340). The 4.7mm Ethos (x575) didn’t improve the view just seperated core and SN more but at the expense of crispness due to seeing conditions. I would still say it’s white to off-white and brighter than the core. If really pushed I would say a hint of greenish-blue along the lines of planetary nebula but this probably a combination of imagination because I was looking for any colour and that faint objects (relatively) always having a tendecy of being gray or ‘bluish’ to me. Andrew16 February 2018 at 10:21 pm #579128Dean EvansParticipant
I imaged it on Tuesday night (first real photography attempt for me) I think the Supernova looks brighter that the galaxy core In my image.
50 x 30s exposures with C9.25 and Canon 450D camera18 February 2018 at 11:27 pm #579139
Thanks Andrew.19 February 2018 at 9:28 pm #579142Callum PotterKeymaster
Thanks all for the observations.
I have been trying to observe with iTelescope in Spain, but the weather there has been poor the last few nights.
Cheers, Callum19 February 2018 at 9:37 pm #579143
So the weather there is no different to here then! I have my fingers crossed for a bright supernova (mag 11-13), well separated from the host galaxy nucleus, and present in a relatively sparse star field. I would like to try to get a spectrum using my slitless StarAnalyser. Is this too much to ask? 🙂
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