AT 2021hpr

AT 2021hpr

Postby Frederic Pastor » Thu Apr 08, 2021 8:46 am

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 SN2021hlp.jpg
Astrometry


After 6 pictures of 600 sec each, and star reference with HD107193, I obtained the following Spectra :

Sn2021hpr 8 avril 2021 Fred Pastor.jpg
Sn 2021hpr
Sn2021hpr 8 avril 2021 Fred Pastor.jpg (73.27 KiB) Viewed 1694 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.

gelatoplot (5).png
gelato SN2007ru
gelatoplot (5).png (55.98 KiB) Viewed 1694 times


Hope this SN will continue to get much brighter in the coming days !

Cheers
Frederic Pastor
 
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Re: AT 2021hpr

Postby JP Nougayrede » Tue Apr 13, 2021 8:10 am

Well done Frédéric, mag 16, getting serious !
Jp
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Re: AT 2021hpr

Postby Robin Leadbeater » Tue Apr 13, 2021 12:40 pm

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 1550 times


_sn2021hpr_20210412_999_SNIDfit.png
_sn2021hpr_20210412_999_SNIDfit.png (57.62 KiB) Viewed 1550 times


Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
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Re: AT 2021hpr

Postby Frederic Pastor » Tue Apr 13, 2021 5:59 pm

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
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Re: AT 2021hpr

Postby Jaroslaw Grzegorzek » Wed Apr 21, 2021 7:41 am

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 1381 times


SN2021hpr.png
SN2021hpr.png (15.96 KiB) Viewed 1381 times


2021hpr_GELATO.PNG
2021hpr_GELATO.PNG (76.16 KiB) Viewed 1381 times


2021hpr_SNID.PNG
2021hpr_SNID.PNG (27.01 KiB) Viewed 1381 times
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Re: AT 2021hpr

Postby Jaroslaw Grzegorzek » Wed Apr 21, 2021 12:42 pm

2021hpr_tns.png
2021hpr_tns.png (51.88 KiB) Viewed 1358 times
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