SN 2022hrs bright in NGC4647

Robin Leadbeater
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SN 2022hrs bright in NGC4647

Post by Robin Leadbeater »

supernova SN 2022hrs is currently near maximum at mag 13 in NGC4647
https://www.rochesterastronomy.org/snimages/
It was formally classified as a type Ia (an exploding white dwarf in a binary system) by amateur Claudio Balcon using a slit grism spectrograph based around a Star Analyser just 50 minutes after its discovery was announced on TNS
https://www.wis-tns.org/object/2022hrs

Here is is with the ALPY600 (spectrum fits file in BAA spectroscopy database)
SN2022hrs_guider_15s_20220422.png
SN2022hrs_guider_15s_20220422.png (183.79 KiB) Viewed 3855 times
SN2022hrs_ALPY600_raw_4x600s_20220422.png
SN2022hrs_ALPY600_raw_4x600s_20220422.png (227.8 KiB) Viewed 3855 times
sn2022hrs_20220422_snidfit.png
sn2022hrs_20220422_snidfit.png (61.62 KiB) Viewed 3855 times
and with the Star Analyser 100
SN2022hrs_SA100_20220424_annot.png
SN2022hrs_SA100_20220424_annot.png (648.17 KiB) Viewed 3855 times
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Matthieu Le Lain
Posts: 24
Joined: Mon Apr 15, 2019 4:33 pm

Re: SN 2022hrs bright in NGC4647

Post by Matthieu Le Lain »

Hi all, Hi Robin,

Thanks for this informations, i take a spectrum of this sn last night with my alpy on C8. Here is the spectrum
SN2022hrs_ml
SN2022hrs_ml
I have a strange line at 4531A. I think it's a artefact, but it's present on each spectra (5 x 600s). Have you any idea ?
sn2022hrs_gelato
sn2022hrs_gelato
sn2022hrs_spec
sn2022hrs_spec
sn2022hrs_sky
sn2022hrs_sky
sn2022hrs_sky.jpg (232.37 KiB) Viewed 3786 times
Matthieu
Robin Leadbeater
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Re: SN 2022hrs bright in NGC4647

Post by Robin Leadbeater »

Matthieu Le Lain wrote:
I have a strange line at 4531A. I think it's a artefact, but it's present on each spectra (5 x 600s). Have you any idea ?
Nice spectrum ! You sometimes see sharp emission lines from contamination from the galaxy spectrum but this does not look like that. I suspect it is an artefact. (A cold pixel or a hot pixel that has been made black by the dark subtraction perhaps ?) Can you see it in the images? Does it look like a single pixel? (A real absorption line would appear across the full thickness of the spectrum)

Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Matthieu Le Lain
Posts: 24
Joined: Mon Apr 15, 2019 4:33 pm

Re: SN 2022hrs bright in NGC4647

Post by Matthieu Le Lain »

Yes, it is !

Thx for your help Robin

Here is the spectrum, without it
sn2022hrs_ml_2
sn2022hrs_ml_2
Matthieu
Vincent Lecocq
Posts: 40
Joined: Fri Mar 04, 2016 3:52 pm

Re: SN 2022hrs bright in NGC4647

Post by Vincent Lecocq »

hello,

here is also the spectrum of SN 2022hrs last night:
sn2022hrs.png
sn2022hrs.png (53.91 KiB) Viewed 3673 times
vincent
Juan Jose Pueyo
Posts: 21
Joined: Thu Nov 12, 2020 4:35 pm

Re: SN 2022hrs bright in NGC4647

Post by Juan Jose Pueyo »

Supernovae within the reach of amateurs have magnitudes usually between +12 and +18. So far, using the Alpy600 with Atik 314L+ (for spectrum) and Atik Titan (for observation and guidance) I have reached magnitude +14. The telescope is a SC8" at f/6.3. The problem to go lower is that I have to see the object, to keep it in the slit of the spectroscope, and guide it if possible. Is there a way to improve in that regard? How to get a better view of faint objects?
Cheers Juan José Pueyo
Juan José Pueyo
Azara Obs.
Azara (Huesca)
etienne bertrand
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Joined: Mon Aug 31, 2015 11:26 am

Re: SN 2022hrs bright in NGC4647

Post by etienne bertrand »

Bonjour à tous,

Un peu de retour après une reprise du sport !!! Ou il y a aussi le triptyque : repos-hydratation-alimentation qui ne permet pas trop de faire des nuits blanches !! je profite d'une pause pour refaire chauffer l'Alpy et j'espere bientot le Lhires.

Ma contribution pour cette SN : Alpy600 sur C11 - Atik414
Image
Benjamin Mauclaire
Posts: 258
Joined: Thu Sep 29, 2011 10:14 am

Re: SN 2022hrs bright in NGC4647

Post by Benjamin Mauclaire »

Hello,

Bertrand tu sembles confondre décalage Doppler et vitesse d'expension, respectivement ici de 248 A (-11699 kms) et 0.5fwhm=~100 A (4830 kms)

Benji
Spcaudace spectroscopy software: saving you hundred hours of frustration.
Robin Leadbeater
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Re: SN 2022hrs bright in NGC4647

Post by Robin Leadbeater »

Juan Jose Pueyo wrote:Supernovae within the reach of amateurs have magnitudes usually between +12 and +18. So far, using the Alpy600 with Atik 314L+ (for spectrum) and Atik Titan (for observation and guidance) I have reached magnitude +14. The telescope is a SC8" at f/6.3. The problem to go lower is that I have to see the object, to keep it in the slit of the spectroscope, and guide it if possible. Is there a way to improve in that regard? How to get a better view of faint objects?
Cheers Juan José Pueyo
Hi Juan José,

To guide on faint targets I offset guide using another star in the field. (I use PHD2 for guiding but it should be possible to do this with other guider programs.)

First I take a deep image of the field from the guider camera (typically 20x20 sec, aligned and stacked) and measure the difference in pixels X and Y between the star I want to guide on and the target. I also note the X Y coordinates of the centre of the slit.

I then add the XY offset to this, place the guide star at this position and start guiding. I usually then take a long guider exposure, say 15 sec to check everything is ok before starting a long exposure on the spectrum camera (typically 1-2 hours in 600 or 1200 seconds exposures)

Here is an example from last night of a 15 second exposure from the guide camera. (SN2022fuc at mag 16.5) The guide star was bright enough to use shorter exposures for guiding.
sn2022fuc_guider_15sec.png
sn2022fuc_guider_15sec.png (192.55 KiB) Viewed 3461 times
I use the same technique for extended objects like galaxies and nebula and for comets and asteroids where PHD2 can be programmed to automatically change the offset to keep the target on the slit

Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Robin Leadbeater
Posts: 1926
Joined: Mon Sep 26, 2011 4:41 pm
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Re: SN 2022hrs bright in NGC4647

Post by Robin Leadbeater »

Robin Leadbeater wrote:
First I take a deep image of the field from the guider camera (typically 20x20 sec, aligned and stacked) and measure the difference in pixels X and Y between the star I want to guide on and the target. I also note the X Y coordinates of the centre of the slit.
This is the image I used to measure the offset (4x20sec)
sn2022fuc_offset_guiding.png
sn2022fuc_offset_guiding.png (119.83 KiB) Viewed 3455 times
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
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