potentially bright SN in NGC3254

potentially bright SN in NGC3254

Postby Robin Leadbeater » Thu Jan 10, 2019 8:35 pm

A supernova has been reported in NGC3254
https://wis-tns.weizmann.ac.il/object/2019np
It is currently faint at mag 18 (right at my limit) but according to the published spectrum it is a type Ia, possibly caught a remarkable 2 weeks before maximum so based on the distance to NGC3254 and that from the spectrum there does not seem to be much redenning, it could reach ~mag 13.

One to watch!

Robin
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Re: potentially bright SN in NGC3254

Postby Rainer Ehlert » Fri Jan 11, 2019 6:58 pm

Hi Robin,

Interesting, Well situated for me right now at a good time of the night too. Midnight :-)

Rainer
regards Rainer____Observatorio Real de 14_____MÉXICO_____N 22° W 101°

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Re: potentially bright SN in NGC3254

Postby Peter Somogyi » Sat Jan 19, 2019 5:58 pm

Hello,

Last night's result (300/1200 Newton, Alpy 600, 18 micron slit, ATIK 414 EXm, 8 x 1800 sec, 2019.01.18,917, R~670), using Gelato's comparison graph (gelato.tng.iac.es):
gelato_asdb_sn2019np_20190118_917.png
gelato_asdb_sn2019np_20190118_917.png (75.37 KiB) Viewed 32 times

The moon was high and had to subtract lots of background (30 min exposures at -20C), but the features matching very well.
There is only some shift in the H-alpha absorption .
This SN is reported now at 13.7 mag (http://www.rochesterastronomy.org/snimages/), but since no obvious emission, had to produce good SNR at continuum level.
The weather was good, but I was rather unsure when the clouds will come. Nevertheless, taken ref.stars 3 times (HD89744) as IR and response, so the response calibration quality should be good.
Gelato says 100% SN Ia match, and enlists outstanding confidence with SN2003du (phase: -9.9d).
I believe that my extra UV end here is real (except the last 1-2 pixels cutoff).

Happy hunting!
Peter

PS: attaching the zip
asdb_sn2019np_20190118_917.zip
(9.76 KiB) Not downloaded yet
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