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Old 16-03-2015, 08:46 AM
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astroron (Ron)
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Supernova in NGC2442

My first new Supernova observation for 2015.
I have observed the PSN J7361 in NGC 2442.
Seeing was only average 3-5 Transparency 7/10
16" Newtonian 6mm radian 300 xmag 3.5mm TVNagler 533xmag
Seen with direct vision. estimated mag 15xmag
15/03/15 10:35 UT 20 :35 AEST
This galaxy has a low surface brightness even though it has a given magnitude of 10.4. it has a bright starlike nucleus.
On the meridian at time of observation.
Cheers
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Old 17-03-2015, 12:20 PM
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barx1963 (Malcolm)
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Nice one Ron!!
Do you know what the current mag. of the supernova is? Hoping to have a try for it on the weekend.

Cheers

Malcolm
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Old 17-03-2015, 01:19 PM
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Originally Posted by barx1963 View Post
Nice one Ron!!
Do you know what the current mag. of the supernova is? Hoping to have a try for it on the weekend.

Cheers

Malcolm
Hi Malcolm, as in my report my estimation is Mag 15.0 but the bright supernova page gives it at mag 15.3.
http://www.rochesterastronomy.org/snimages/

It should be a lot higher from your location the chances of a better observation are with you.
On or around the meridian at 10:00 UT 21:00 ASDT.
Cheers
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Old 17-03-2015, 09:02 PM
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Originally Posted by astroron View Post
Hi Malcolm, as in my report my estimation is Mag 15.0 but the bright supernova page gives it at mag 15.3.
http://www.rochesterastronomy.org/snimages/

It should be a lot higher from your location the chances of a better observation are with you.
On or around the meridian at 10:00 UT 21:00 ASDT.
Cheers
Sorry Ron, didn't read it carefully enough, that's what comes of trying to read posts while at work!!

I have had a bit of a read up on this galaxy, seems John Herschel recoded it initially as 2 objects so it is recorded as both NGC 2442 and NGC 2443, but it seemed he was seeing patches rather than the whole objects.
It is odd as the entire galaxy was easy to see in my 12" back in Feb 2012 when I nabbed it at Snake Valley.
Hopefully if the SN peaks on the weekend should make a nice sight!!

Cheers

Malcolm
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Old 17-03-2015, 09:34 PM
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Asterix2020 (Paul)
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Gee that's a faint galaxy. I'm taking a bunch of 5 min subs, but the tracking / alignment isn't quite there for the RC8. Will need to work on that. Here's a single 5 min sub, quickly processed. Shows the supernova quite well, I'd say from comparison with my SkyTools map that it is about 13 mag? I could be wrong
Attached Thumbnails
Click for full-size image (NGC2442 1 sub quick.jpg)
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Old 17-03-2015, 09:35 PM
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Quote:
Originally Posted by barx1963 View Post
Sorry Ron, didn't read it carefully enough, that's what comes of trying to read posts while at work!!

I have had a bit of a read up on this galaxy, seems John Herschel recoded it initially as 2 objects so it is recorded as both NGC 2442 and NGC 2443, but it seemed he was seeing patches rather than the whole objects.
It is odd as the entire galaxy was easy to see in my 12" back in Feb 2012 when I nabbed it at Snake Valley.
Hopefully if the SN peaks on the weekend should make a nice sight!!

Cheers

Malcolm
Malcolm, I can see where John Herschel could mistake it for two objects as the starlike nucleus can at times make it look as two close objects.
Glen Cozens (GlenCon here) estimated that Herschel's 18.5" speculum mirror was the equivalent of a goods 16" mirror of today's telescopes.
My view of the galaxy was not the best, the seeing and transparency was as I said average.
I have seen it much better in the past.
Best of luck with your obs of the SN,let me know how you got on?
I will be interested to see if it is visible in a 12" scope.
Cheers
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Old 17-03-2015, 09:50 PM
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Quote:
Originally Posted by Asterix2020 View Post
Gee that's a faint galaxy. I'm taking a bunch of 5 min subs, but the tracking / alignment isn't quite there for the RC8. Will need to work on that. Here's a single 5 min sub, quickly processed. Shows the supernova quite well, I'd say from comparison with my SkyTools map that it is about 13 mag? I could be wrong
Good to see you getting some images Paul.
Bright Supernova http://www.rochesterastronomy.org/snimages/
are still reporting it as 15.3.
Going by your pic I would say it is still around 15, going by those two other stars which are around the same brightness, if not a little fainter.
Cheers
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Old 17-03-2015, 10:17 PM
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Quote:
Originally Posted by astroron View Post
Malcolm, I can see where John Herschel could mistake it for two objects as the starlike nucleus can at times make it look as two close objects.
Glen Cozens (GlenCon here) estimated that Herschel's 18.5" speculum mirror was the equivalent of a goods 16" mirror of today's telescopes.
My view of the galaxy was not the best, the seeing and transparency was as I said average.
I have seen it much better in the past.
Best of luck with your obs of the SN,let me know how you got on?
I will be interested to see if it is visible in a 12" scope.
Cheers
Unfortunately I don't have a 12" anymore, will be make do with the 20". Might try to steal a look through a 12" at the camp on the weekend if I can.

Malcolm
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Old 17-03-2015, 10:25 PM
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Originally Posted by barx1963 View Post
Unfortunately I don't have a 12" anymore, will be make do with the 20". Might try to steal a look through a 12" at the camp on the weekend if I can.

Malcolm
Should be a piece of cake in the 20"
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Old 18-03-2015, 09:13 PM
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Nabbed it tonight. Very easy to see in the 20". Also had a look at ESO 59-11 which is a nice little galaxy sitting just west of NGC2442

Malcolm
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Old 18-03-2015, 09:47 PM
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Originally Posted by barx1963 View Post
Unfortunately I don't have a 12" anymore, will be make do with the 20".

Malcolm
Don't go looking at the new nova in Sagittarius Malcolm, you might blind yourself!!

Cheers -
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Old 23-03-2015, 07:01 PM
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Here's the final image. I think the focus was off a bit. Not sure why, but on my original sub RAW and this processed image, the supernova appears brighter than the adjacent star, which is why I guessed bright than you said Ron.

Tracking and focus was not the best, but the aim was the get the supernova.

Better resolution: http://www.astrobin.com/166633/B/
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Last edited by Asterix2020; 23-03-2015 at 07:41 PM.
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Old 23-03-2015, 07:59 PM
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Just look it up and found it's full catalog name is PSN J07361576-6930230
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Old 23-03-2015, 10:02 PM
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Quote:
Originally Posted by Asterix2020 View Post
Just look it up and found it's full catalog name is PSN J07361576-6930230
Yep that is correct,but the usually only use the first four numbers for short.
It's full title was in the link I provided in my opening post.
Cheers
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Old 27-03-2015, 10:13 PM
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Originally Posted by Asterix2020 View Post
Just look it up and found it's full catalog name is PSN J07361576-6930230
Now it's 2015F, refer CBET 4081 : 20150326 : SUPERNOVA 2015F IN NGC 2442 = PSN J07361576-6930230:
http://www.cbat.eps.harvard.edu/cbet/RecentCBETs.html

That's the first supernova CBET issued since late January. CBAT must be either overwhelmed with discoveries or short on staff!

Cheers -
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Old 27-03-2015, 11:09 PM
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Originally Posted by Rob_K View Post
Now it's 2015F, refer CBET 4081 : 20150326 : SUPERNOVA 2015F IN NGC 2442 = PSN J07361576-6930230:
http://www.cbat.eps.harvard.edu/cbet/RecentCBETs.html

That's the first supernova CBET issued since late January. CBAT must be either overwhelmed with discoveries or short on staff!

Cheers -
Thanks Rob,
I was wondering when they were going to start putting titles to the myriad of Supernova's discovered this year
Cheers
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Old 28-03-2015, 08:58 AM
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Clouded out or Moon in the way every night I had the time...
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Old 28-03-2015, 09:37 AM
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Clouded out or Moon in the way every night I had the time...
THE Supernova was observed with ease in the sky glow of the 5 day old moon.in both 16" and 10" scopes.
Best of luck in getting an observation,it will be quite bright for a little while yet.
Cheers
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Old 13-04-2015, 02:58 PM
N1 (Mirko)
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Hi Ron, when was your latest observation? Just wondering if it's still worthwhile. I might get a chance to point a 14" and 18" at it this week, unfortunately from suburbia only. Thanks
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Old 13-04-2015, 04:14 PM
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Hi Ron, when was your latest observation? Just wondering if it's still worthwhile. I might get a chance to point a 14" and 18" at it this week, unfortunately from suburbia only. Thanks
Hi Mirko,last night,it is still bright at 12.8,should be quite visible in said scopes.
Print off a pic to make sure you have the right star.
The galaxy has a low surface brightness but a bright star like nucleus.
I have attached a pic the SN is marked in the upper hook,the brightest of the three stars.
This was taken when the SN was nearly 14 mag.
Use the little galaxy ESO 59-11 as your guide.
In my scope the small galaxy is below NGC2442 and the SN is too the left of the nucleus.
Cheers
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