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possible supernova AT 2021aai in NGC 2268

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Robin Leadbeater's picture
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Last seen: 16 hours 50 min ago
Joined: 05/03/2014 - 00:50
possible supernova AT 2021aai in NGC 2268

https://www.wis-tns.org/object/2021aai

mag 18.7 at discovery but could reach mag 13 (plus extinction) if type Ia

Robin
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nickjames's picture
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Joined: 12/10/2013 - 18:16
Just south of a field star

Here's an image of it from Jan 12.9. It is a difficult object to measure since there is a 17th mag star around 3 arcsec north of it. I get 17.9 tonight.

Robin Leadbeater's picture
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well done for splitting

Well done for splitting it from the nearby star. I put the spectrograph slit on it but it is so messy round there, it is going to have to outshine the star and galaxy background if I am going to have any chance.

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Yes, I thought this one would

Yes, I thought this one would be a challenge. It had a whole galaxy to go off in and it did it next to a relatively bright field star! How big is the slit you use and can you orient it to avoid that star?

Robin Leadbeater's picture
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23 microns

The slit is 23 microns or 3 arcsec. It normally runs in the Dec direction which is probably the best bet as the star and PSN will lie at different positions along the slit provided the seeing and guiding is good enough to split them. I could just pick up a weak spectrum of the pair with perhaps signs of a broad H alpha emission line  which would indicate a type II, though there is quit a bit of that around in the galaxy background as well. No split though (and to be honest at mag 17.9 I would not stand much of a chance of getting a useable spectrum in any case)