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bright Supernova in M82

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bright Supernova in M82

Posted by Denis Buczynski at 11:40 on 2014 Jan 22

Hello all,There has been a report on the Transient Objects Conformation Page of a bright SN in in galaxy M82.PSN J09554214+6940260R.A. 09h55m42.14s Decl. +69o40'26.0" (J2000.0)V=11.7 on 2014 Jan. 21.81 UTSeiichiro Kiyota (Kamagaya, Japan) reports:I took confirmation images (exp. times were 30 sec, each) of this PSN with0.43m Astrograph+FLI FLI-PL6303E CCD camera at Mayhill, USA (T21,iTelescope.NET), remotely. Photometry results were B=12.96, V=11.68,Rc=11.04 and Ic=10.63 using TYC 4383-2050-1 as a comparison. I checkedvarious CCD images via google image search. My image is available at http://meineko.sakura.ne.jp/ccd/PSN_J09554214+6940260.jpghttp://www.cbat... Buczynski

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Re: bright Supernova in M82

Posted by Robin Leadbeater at 15:28 on 2014 Jan 22

A type 1a so I make that around Vmag 8.5 (plus any extinction) in a couple of weeks time. I sense the first high resolution amateur sn spectra beckoning :-) Robin

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Re:bright Supernova in M82

Posted by R S Winter at 17:41 on 2014 Jan 22

Dear AllThis Supernova was observed by chance at ULO Mill Hill Observatory last night. This was during a student training session. Steve Fossey has applied for this to be a discovery image. See:http://www.ucl.ac.uk/maps-faculty/maps-news-publication/maps1405RegardsBob Winter

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Re:bright Supernova in M82

Posted by Nick James at 19:14 on 2014 Jan 22

Bob,The time of the first report on TOCP is 2014 01 21.81 which corresponds exactly to the UCL time of observation (19:20) so is the TOCP report from the UCL group?Well done to them! Nice to get an SN discovery from Mill Hill. What was the last object discovered from there I wonder?Nick.

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Re:bright Supernova in M82

Posted by Robin Leadbeater at 21:48 on 2014 Jan 22

I am following up a report of it being visible in an image taken 19th Jan. http://stargazerslounge.com/topic/206101-bright-supernova-in-m82/It seems a bit unlikely given how many people must look at this object every night but if it does pan out what is the procedure for reporting it? Anyone here versed in issuing ATELS ?CheersRobin

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Re:bright Supernova in M82

Posted by Robin Leadbeater at 21:58 on 2014 Jan 22

Images here show the sn clearly visible from Jan 15th. http://www.k-itagaki.jp/psn-m82.jpgHow was this missed in such a popular object for 6 days ?! There must be quite a few people kicking themselvesRobin

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Re:bright Supernova in M82

Posted by Gordon Mackie at 00:13 on 2014 Jan 23

Robin Leadbeater wrote:

Images here show the sn clearly visible from Jan 15th. http://www.k-itagaki.jp/psn-m82.jpgHow was this missed in such a popular object for 6 days ?! There must be quite a few people kicking themselvesRobin

I suppose I should be, but I'm still delighted I managed to discover it independently, even if it was a day after the first people did (http://stargazerslounge.com/topic/206101-bright-supernova-in-m82/#entry2...)Gordon

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Re:bright Supernova in M82

Posted by Gary Poyner at 10:15 on 2014 Jan 23

Gordon's pre-discovery image of SN 2014J and a spectrum and image taken by David Boyd can be seen on the BAAVSS web page...http://www.britastro.org/vss/Gary

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Re:bright Supernova in M82

Posted by David Strange at 13:33 on 2014 Jan 27

And here's my attempt with a Star Analyser and Celestron 9:http://spaceweathergallery.com/indiv_upload.php?upload_id=93325David

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Re:bright Supernova in M82

Posted by Mike Harlow at 14:50 on 2014 Jan 27

I made my first attempt at a supernova spectrum last night but using an objective prism. Reasonable result but it's just about at the limit of what I can do with my current set up. The spectrum is on the Forum of the Orwell Astronomical Society at:http://forum.oasi.org.uk/viewforum.php?f=6.Sorry that I've got red to the left in my image against the usual convention. But then prisms do disperse in the opposite direction to gratings(!).Mike.

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Re:bright Supernova in M82

Posted by Robin Leadbeater at 17:10 on 2014 Jan 27

And I see David's is still on the front page of spaceweather.com currentlyMike I see your spectrum shows the interstellar NaD line which does not bode well for this object reaching the originally predicted brightness Robin

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Re:bright Supernova in M82

Posted by David Strange at 18:47 on 2014 Jan 27

Why should that be Robin? I thought these things were meant to be standard candles!CheersDavid

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Re:bright Supernova in M82

Posted by Robin Leadbeater at 19:32 on 2014 Jan 27

Hi David,Type 1a are indeed the standard candle but you need to take into account the extinction due to everything between it and us. This is done in various ways eg by measuring the amount the spectrum is reddened (The spectrum should get brighter towards the blue but here has a downward slope towards the red) or by measuring the strength of the absorption lines from the interstellar material like the Na D lines here. There is an impressive (to me at least!) early analysis of these in http://www.astronomerstelegram.org/?read=5797 CheersRobin

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Latest SN 2014J lightcurve

Since posting this discovery announcement at the end of January, both Nick James and myself have been observing this bright Supernova using multicolour photometry. We have been pleasantly surprised by the number of observing opportunities that we have had during these winter months at opposite ends of the east coast. The weather has been very mobile and clear spells have been frequent, but sometimes fleeting. We hope other observers have had similar experiences over the last few months. Our observations are shown an the attached lightcurve which is from the AAVSO database (the crosses are NDJ observations and the squares are DGB). The SN is currently very red and we have not transformed our measurements to exactly match V and R hence the bias between our two sets of observations. This supernova is at an interesting stage of its development and we would encourage more observations from BAA observers.