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alanjgreen

Supernova in NGC3254 (SN2019np)

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Type 1A supernova discovered in NGC3254 on 9Jan and brightening, now at 15.7 mag. Named as SN2019np.

http://www.rochesterastronomy.org/supernova.html#2019np

image.png.e59ccfd70456fc32997751999e63cfb7.png

image.png.ef948a5df9f5ac167fc8d5f6290830aa.png

Looks like an early morning target for the UK (shame about the moon), should be good for a couple of months though...

Alan

Edited by alanjgreen
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Just tried to take a couple of pic's of it but cloud and wind ruined them, looks possible though on a better night.

Dave

Edited by Davey-T

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It'd be visible to me, in principle, - shame I have no gear that would pick the galaxy up :(

Louise

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Persevered and got 5 short subs between the clouds and gusts of wind, no calibration as you can see :grin:

Dave

NGC3254-SN.png.2527e5d0848e904b8f71a433ea029ca1.png

 

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Cracking capture Dave.

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Thanks for the 'Heads Up' Alan - lets hope it gets a bit brighter and we have some clear skies to view it.

Nice capture Dave

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I’ve just spent a couple of happy hours attempting to observe this one. Wasn’t supposed to be clear, but turned out nice.

Not a definite observation. Something there which is in the right sort of orientation to the galaxy core. Being surprised by clear sky and thoroughly excited about getting some time with the scope, I didn’t print off any of the images or take a sketch pad out with me. Bare in mind that the majority of the really faint stars are not on any chart, so an image clearly showing the Galaxy and surrounding stars is vital. Or, a good detailed sketch will do for latter comparison.

I was using a 16” Dob and TV Plossls. First up. I hit NGC3245 (mag 10.8) by mistake nice and bright, so not a bad place to go from. It’s identity was verified by following the direction of drift past a distinctive pair of stars and straight onto NGC3237 (mag 11.7), then back to NGC3265 (mag 12.7) to confirm my position. A hop straight up to NGC3254 (mag 11.7). Spent a good hour of  trying different mags, scope wobbling, blinking etc. As mentioned, there is something there, but I need another session to claim a definite identification.

Hoping for another moonless session soon.

Paul

Edited by Paul73
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Great description of star hopping (well ok, galaxy hopping, same principle).  Also just to show that mega widefield eyepieces are not the only way to go......

“Wasn’t supposed to be clear but it was”, usually vice-versa........☹️

 

Ed.

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Can’t afford decent wide field eyepieces! It is a lot easier with a case full of Ethos ?.

Thanks for you comments on the galaxy hopping. A 70mm finder scope helps, but after that, you have to get creative.

Paul

Edited by Paul73

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I bagged SN 2019np this morning after 3am!

I saw it with the Ethos 13 (x150) & Ethos 10 (x200) then swapped to Night Vision and got it with the 55mm Plossl (x38).

The Moon was due to go at 4am so the sky was darkening all the time.

Here is my sketch of the star formation and SN 2019np.

image.png.e103e39f25af40b00c9cef277a8ae24d.png

With the Ethos 13 and 10, I basically saw the galaxy + SN and stars marked A,B,C that was about it. I saw many more stars with the Night Vision plus the galaxy core.

Hope you can get it too?

Alan

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Well done. Your sketch is pretty much exactly what I saw. Although, it was harder work with only 16” to work with ?. There are a couple of faint stars either side of the core in the images which look the same brightness as the Supernova. I was concerned that I had seen one of them. They are obviously dimmer if you didn’t catch them. So I’ll claim my observation as “verified” too! Thanks for posting the sketch.

Paul

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1 minute ago, Paul73 said:

 There are a couple of faint stars (one) either side of the core in the images which look the same brightness as the Supernova.

Yep, I saw both of those two stars with the Night Vision, they were both dimmer than the SN. I have them both on my "live" sketch but I just wanted to put fewer stars on the orientation sketch.

Alan

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Brightening nicely. Aprox 13.5 now!

The moon will be out of the way in a week. Should be accessible to a lot more scopes by then.

Paul

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CO forecast is clear tonight, mind it says it's cloudy ATM and there's not a cloud in sight, so will try to have another shot at it to compare to the last one.

Dave

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Not had another go at it yet, only clear night was occupied with Lunar eclipse, not looking good here until next week ATM

Dave

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On ‎24‎/‎01‎/‎2019 at 15:50, Mark at Beaufort said:

I notice that yesterday the mag was estimated at 13.5 - hopefully the skies will be clear over the weekend

Just had a look at it with 10"SCT and it looks brighter than last time I looked, comparing it to adjacent stars maybe mag 13.7.

A bit foggy but will have a go at imaging it before the Moon gets too high.

Dave

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I managed to get 15 x 2 minutes through thin high cloud earlier.  It's somewhat brighter than cotak's image of 15 Jan. but still no chance of me seeing it visually.

 

NGC3254 SN 2019-01-28.jpg

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Got it visually last night. There was a period of good seeing around midnight.

The Galaxy was clear and large (in 16” f4 Dob at approx x105 mag 5.25ish Sky), not much of a core visually, which might hinder those with more LP or fewer inches. The SN was clear and unmistakable at mag 13-14 ish direct vision.

I wonder how long it will last?

Paul

Edited by Paul73
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1 hour ago, Paul73 said:

Got it visually last night. There was a period of good seeing around midnight.

The Galaxy was clear and large (in 16” f4 Dob at approx x105 mag 5.25ish Sky), not much of a core visually, which might hinder those with more LP or fewer inches. The SN was clear and unmistakable at mag 13-14 ish direct vision.

I wonder how long it will last?

Paul

Yep, me too. SN2019np was much brighter & easier last night. I could see the galaxy disk in the 20” but the two faint stars close in on either side were much fainter. So, I also agree that conditions were not as good as my first sighting on the 17th Jan.

I got it just after 1am. I was using the 55mm plossl and night vision device at x38 magnification.

Alan

Edited by alanjgreen

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I tried last night with the 12" Dob and I needed averted viewing to see the galaxy. I think it was partly because the view was just above the house and looking towards Hereford with some LP.

As you can guess I did not see the SN.

I will hopefully try again if the sky remains clear over the next few days but wait for Leo Minor to rise higher.

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    • By alanjgreen
      Date: Thursday 17th January 2019. 0310-0640hrs
      Scope: 20” f3.6 Lukehurst Dob with Paracorr (fl = 2089mm & f4.1).
      Night Vision: PVS-14 with Photonis 4g INTENS. Plossl 55mm (f2 x38).
      Eyepieces: Ethos 13mm (x150), Ethos 10mm (x200).
      Moon: 75% (until 4am)
      Introduction.
      Last night was one of those “nervous” nights when you go to bed early with clear skies outside (including a 75% Devils Orb ?) and set your alarm for 3am hoping the clear skies will still be there (but not the Orb)…
      I awoke around 0250am and checked outside, still clear! I dressed and headed off down to the shed…
      Once setup and having completed the alignment for Nexus, I headed straight for the supernova SN 2019np in NGC3254. (I had drawn a star map earlier from some of the posted images!)
      Supernova SN 2019np ?
      I started with the Ethos10 (x200) and could see the hazy galaxy patch with a dot in the right place for the supernova. I could pick out 3 other stars and went to check my star map. I recognized the 2 bright stars and swapped to the Ethos13 (x150) for a bit more of the field. I could still see the SN with the lower power but field stars were still at a premium (the moon had not quite gone in the West so the sky was being impacted).
      I switched to Night Vision and added the 55mm Plossl with the PVS-14 NVD attached. Now I was down to only x38 magnification but the galaxy and SN were clear and easy. I now had many more fainter stars to work with and returned to my drawn star map. I matched up a few more stars and hey presto – the SN 2019np was observed!
      Now, I sketched out a new map based on what I could see…

      Brightest Galaxy Observing List
      I had come across a post on cloudynights detailing a list of 210 brightest galaxies and had used this list to make an “observing list” in Sky Safari 5. Now it was time to highlight that list and see what Night Vision could make of these brightest few…
      NGC3432 – edge-on. Bright. Seems to have a black mark coming in on one side. Needs more magnification.
      ?NGC3184 – ARMS! Decent size too. Circle of arms around the core then backwards “S” of arms clearly seen.
      M108 – Flat edge-on disc. 2 bright patches (1 is core and other on RHS). Two large black areas above and below.
      ?NGC3631 – ARMS! Core surrounded by circular disk. Playing with the gain, I see what looks like a double arm up over the top.
      NGC3718 (+ 3729) – both galaxies seem to have delicate faint arms. 3729 is tiny. 3718 has a circular arm shape around the core & black patches on both sides.
      NGC3917 – faint vertical edge-on.
      NGC3953 – bright side-on. 2 black patches on either side.
      ?M109 – ARMS! Central horizontal bar then 2 sweeping arms in a backwards “S” shape.
      NGC3893 (+3896) – ARMS! 3893 is bright with a clear arm underneath which seems to exit at 12 o’clock and swing left, down and underneath. Tiny 3896 sits nearby.
      NGC3877 – Long flat edge-on with bright core.
      ?NGC3726 - ARMS! Bright side-on with circular arms close-in. Averted reveals a second layer of arms outside.
      ?NGC3938 – ARMS! A fainter galaxy but faint arms can be seen.
      NGC4111 (+4117) – Small edge-on with a bright core. Underneath lies tiny 4117. Just above I see a large faint edge-on (UGC7089) & another (PGC38276) is also faintly seen (separated by a star).
      ?NGC4449 – ARMS! This is an interesting one! It seems to have bright patches either side of the core that appear as a “vertical bar”. There is an arm underneath RHS (it seems to exit the lower bar).
      NGC4490 (Cocoon) – Vertical bar with curve of partial arm at top. Smaller NGC4485 to the side appears to have tiny “flick” arms.
      ?NGC4618 (+4625) – ARMS! 4618 has an arm to RHS. Tiny 4625 nearby surrounded by a tiny circular disk. Both galaxies are quite faint.
      M94 – ARMS! Very bright core then surrounding halo then blackness & finally a faint circular disk. Unusual.
      M63 (Sunflower) – Bright core with a halo then more of a bar style extension. Blackness on both sides.
      ?M51 (+5195) (Whirlpool) – ARMS!!! Core of M51 shows both arms exciting. The inner arm shows a black dust lane within as it comes down and under the core. Arms make it over the bridge then go beyond and curve back into NGC5195 (which has a bar shape core).
      ?M101 – ARMS!! As soon as it comes into the FOV, multiple arms are seen in clear view curving over the top of the galaxy. I start to sketch the arms returning for more information at the eyepiece multiple times. I make three iterations of adjustments to the sketch as time passes by…

      ?NGC4278 – ARMS! A smallish side-on with time at the eyepiece then arms appear as a spiral. [Looks like this is elliptical so the “arms” must have been the outer fainter halo?]
      NGC4314 – Bright core. Horizontal bar and black patches on both sides. No arms seen.
      NGC4414 – similar to previous. There is a bright dot in close to the core.
      ?NGC4559 – ARMS! Bright core and surrounding dust disk. Multiple arms coming & going with averted.
      NGC4565 (Needle) – GREAT. ?Long sleek edge-on. Bright central bulge. Lovely black dust lane running through. Galaxy gets longer with averted vision.
      NGC4494 – Bright core & surrounding disk. Blackness on both sides. No arms.
      NGC4631 (Whale) (+4627) – Long thin edge-on. Has bright line detailing on central lower side and a black dart section to RHS. Tiny 4627 sits underneath.
      NGC4656 (+4657)(HockeyStick) – Bright core then brighter one side out to a curve (4657). Other side of the core is less bright.
      NGC5005 – Bright core. Vertical disk side-on. The disk gives the impression of many tiny curved black lanes running within it.
      NGC4244 (Silver Needle) – Long, thin edge-on. Lacks brightness.
      NGC4214 – Core with a dust disk. No arms.
       
      Galaxies have slipped beyond the shed, what else can I find?
      ?M3 globular – Fantastic! Looks like an “Olympic speed skater”. It is resolved to the core revealing 100s of stars. There are so many fainter stars just outside the brighter core area too.
      NGC5466 globular – Faint and widespread with many fewer stars than the “big boys”. I see the shape of “Orion” within it!
      ?M13 Globular – Lovely and bright. The propeller is easy to see. The globular is resolved to the core with the central section so very bright and shimmery. Again, there are so many fainter stars around the edges of the bright core section.
      ?M5 Globular – Lovely and bright. I don’t get to bag this one often from the shed. It has an intriguing star formation that looks like there are “chains of stars” busy orbiting the centre in wide looping orbits.
      M104 Sombrero – Another rare sight from the shed. Its so low that the percentage of mirror on the target must be miniscule! But there it is…
      Sh2-73 – I notice some Sharpless coming up in the South. I throw in the Chroma 5nm Ha filter and manage to bag the large circular (egg) shaped patch of sh2-73. The edges are easily traceable.
      It is now getting lighter to the East and I decide to call it a night!
       
      Thoughts of the observer.
      It was a great start to bag SN 2019np so quickly. I love chasing supernovas so that got me into a great mood to start off! The 210 brightest galaxies should be a nice task for the upcoming galaxy season. I am hitting them with the 55mm Plossl as this gives me the fastest focal ratio for my setup and from my testing last April, is the best way to “see the arms” of galaxies, no matter how small they may be. I counted 13 galaxies showing their arms and I have to be pleased with that. Night Vision does just increase the odds of seeing arms in our favour but its not the silver bullet, the galaxies need to be bright and not too small to increase our chances. It was an added bonus to get into some Globulars. I love the way that the absence makes the heart grow fonder and I never tire of that “first night” explosion of brightness (especially after looking at faint galaxies. I even bagged an additional Sharpless for the icing on the cake. Finally, I was pretty cold when I came in. I am sitting in the study now with my feet on a hot water bottle and wearing a bobble hat on my head. The hot coffee is really hitting the spot too. Here is my Sky Safari Brightest Galaxy observing list should you wish to try it too…(you can import it into your Sky Safari - just email it to yourself then when you try to open the file in the email app it should offer you the chance to "open with Sky Safari") !
      Galaxy High Brightness.skylist Clear Skies,
      Alan
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