AT 2021hpr

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Frederic Pastor
Posts: 23
Joined: Wed Jan 22, 2020 4:57 pm

AT 2021hpr

Post by Frederic Pastor »

Hi Everyone,

A new Supernova discovered last 2nd of April into NGC3147 (well placed for northern hemisphere observers), to share with you. Easy to catch at the begining of the evening, it reached to my estimation a Mag 16 (after a Mag 17.7 when discovered).

Link to get the coordinates : https://www.wis-tns.org/object/2021hpr

Here is a view of my guiding camera, through Astrometry.net :
Astrometry
Astrometry
After 6 pictures of 600 sec each, and star reference with HD107193, I obtained the following Spectra :
Sn 2021hpr
Sn 2021hpr
Sn2021hpr 8 avril 2021 Fred Pastor.jpg (73.27 KiB) Viewed 5291 times
Despite noise (the seeing was excellent and clear sky but I think I reached the limit of my set up), we could recognize a type I b/c with broad lines. It also matched in Gelato database with the SN 2007ru,in term of continuum at least.
gelato SN2007ru
gelato SN2007ru
gelatoplot (5).png (55.98 KiB) Viewed 5291 times
Hope this SN will continue to get much brighter in the coming days !

Cheers
JP Nougayrede
Posts: 152
Joined: Tue Oct 20, 2015 8:33 pm

Re: AT 2021hpr

Post by JP Nougayrede »

Well done Frédéric, mag 16, getting serious !
Jp
Robin Leadbeater
Posts: 1926
Joined: Mon Sep 26, 2011 4:41 pm
Contact:

Re: AT 2021hpr

Post by Robin Leadbeater »

Hi Frederic,

Take care when using classification programs. They are not always reliable. This is type Ia, not 1b/c

I took ALPY200 spectra of this object on 20210403 at ~mag 17(also in TNS) and 20210412 (last night) at ~mag 14.5

The strong broad SiII absorption line characteristic of type Ia supernovae is clear (at 6000A in the earlier spectrum and 6150 A now) and SNID confirms with high confidence that it is a type Ia at the host galaxy redshift from both my spectra
SN2021hpr_20210403_SNIDfit.png
SN2021hpr_20210403_SNIDfit.png (66.79 KiB) Viewed 5147 times
_sn2021hpr_20210412_999_SNIDfit.png
_sn2021hpr_20210412_999_SNIDfit.png (57.62 KiB) Viewed 5147 times
Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Frederic Pastor
Posts: 23
Joined: Wed Jan 22, 2020 4:57 pm

Re: AT 2021hpr

Post by Frederic Pastor »

Hi Jean-Philippe,

Thanks a lot for your post ;)
Getting serious but limit of my humble skywatcher 250mm has been reached apparently ! I should have increased exposures. Particularly when I see the nice spectra of Robin.
And too cloudy at the moment to do it again, unfortunately.
Hope you are doing good.

Cheers.

Fred
Jaroslaw Grzegorzek

Re: AT 2021hpr

Post by Jaroslaw Grzegorzek »

SN 2021hpr spectrum obtained using my R~100 SN-Spec spectrograph. Obs. date: 2021-04-20. Exposure: 3 x 1200 sec. Telescope: SCT Meade 10" f/6.3. Camera: Trius SX-825 mono. Software: MaxImDL+BASS+RSpec:
SN2021_spectrum.jpg
SN2021_spectrum.jpg (36.97 KiB) Viewed 4978 times
SN2021hpr.png
SN2021hpr.png (15.96 KiB) Viewed 4978 times
2021hpr_GELATO.PNG
2021hpr_GELATO.PNG (76.16 KiB) Viewed 4978 times
2021hpr_SNID.PNG
2021hpr_SNID.PNG (27.01 KiB) Viewed 4978 times
Jaroslaw Grzegorzek

Re: AT 2021hpr

Post by Jaroslaw Grzegorzek »

2021hpr_tns.png
2021hpr_tns.png (51.88 KiB) Viewed 4955 times
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