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Comet C/2017 S3 (PANSTARRS) in outburst!

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#1 Uwe Pilz

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Posted 03 July 2018 - 12:00 AM

Dear observers,

yesterday I read the first report about the outburst of this comet. We have very clear sky at the moment here in Germany, so I brought my 12 inch Dob to my rural observation site. Wen the moon rose I finished my observation. The sky was still bright, so the comet is probably even brighter and more brilliant than I saw. I measured a total brightness of 9m7, but the comet may be closer to 9 mag.

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#2 frank5817

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Posted 03 July 2018 - 02:03 AM

Uwe,

 

Thank you- good to know.

Fine sketch.

 

Frank :)



#3 Uwe Pilz

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Posted 03 July 2018 - 04:18 AM

An outburst so far away form the perihel is uncommon. It may be that the core has broken, and that this outburst is the start of disintegration. That means it is worth looking at the comet as soon as possible.


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#4 niteskystargazer

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Posted 04 July 2018 - 02:52 PM

Uwe,

 

Fine sketch of  Comet C/2017 S3 (PANSTARRS) (In outburst!) smile.gif .

 

CS,KLU,

 

thanx.gif ,

 

Tom



#5 iainp

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Posted 05 July 2018 - 01:50 AM

Fantastic Uwe, thanks for this. I just read about the outburst but couldn't find any images or reports about it. Having seen your sketch I'll be hunting for this tonight! 

Iain 



#6 Uwe Pilz

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Posted 05 July 2018 - 04:19 AM

Here is an entry in our German forum, which contains two photographs.

 

the first image is in the sentence

 

und ein schönes Bild von Michael.



#7 iainp

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Posted 05 July 2018 - 08:36 AM

Great information in the link there Uwe, I'm hoping I can see this over my neighbour's house tonight! 

Iain



#8 Aquarellia

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Posted 05 July 2018 - 01:17 PM

Thank you for this "alert" Uwe.  This comet was the star of Spaceweather.com today.

I'll try an observation at 1:00 utc tonight.

Michel


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#9 Aquarellia

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Posted 06 July 2018 - 04:44 AM

Here my observation at 2:16 UTC July 6th on a dark site, but with my Vixen 2x126mm only.  As Uwe said, we have to observe quickly, but it's maybe too late.

The comet was far than conspicious, no pseudo nucleus, so maybe magn +10 but very difficult to estimate a so big diameter (more or less 15' !!!).

 

c2017s320180706_l.jpg

 

So it's probably an "out of outburst".


Edited by Aquarellia, 06 July 2018 - 04:47 AM.

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#10 Uwe Pilz

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Posted 06 July 2018 - 05:47 AM

>  So it's probably an "out of outburst".

 

That would mean, that is "out of a comet". I look whether I find observations somewhere and keep you informed.

 

Two more images with 12 inch aperture (Michael Jäger):

July 4 00.33 UT 22x150sec

July 5 00.53 UT 7x150

 

At the moment, there are not too much visual observations. It seems, however, that the comet gets weaker:

July 2: 9m7 (me)

July 3: 9m7...9m0 (6 obs)

July 4: 9m1 (one obs)

July 5: 9m6 (one obs)

July 7: 9m9 (one obs)

 

The last two are form observers which I don't know by name. Which may mean that they are not as experienced and report weaker magnitudes.


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#11 iainp

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Posted 06 July 2018 - 07:37 AM

Nice capture Michel. "On a dark site, but with my Vixen 2x126mm only". This is a good example of dark skies beating big aperture. I observed the comet at the same time as you last night with the 20" / 509mm scope but it was situated in a light dome and my SQM reading was 19.33!  The comet was basically invisible but with the LP filter and a magnification of 182X I could just glimpse a faint glow with averted vision, no shape, no edges, no brighter centre, just a hint of something there. 

Iain 


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#12 Special Ed

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Posted 06 July 2018 - 07:53 AM

Are you guys observing before moonrise?



#13 iainp

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Posted 06 July 2018 - 10:57 AM

I was, but the light dome of my nearby town centre was brighter than the light dome which would have been caused by the moon!



#14 Uwe Pilz

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Posted 06 July 2018 - 11:28 AM

Our German comet group uses a method of calculating pseudo-visual magnitudes from electronic images. Normally, "electronic" magnitudes are much to faint. This is not the case with the approach of our Thomas Lehmann, which uses all of the coma (easy task visual, hard task from images).

In the meantime, I have some such results. These result show that the coma increases by more or less stead magnitude. This means the comet produces no gas anymore, at least not at the level of the outburst. But the "single event gas" dissipates in the room, and makes the comet harder to detect.

 

   Comet   yyyy mm dd.dd    mag  diameter

   2017S3  2018 05 16.43  Z 15.9  1.2
   2017S3  2018 06 12.43  Z 13.3  3.7
   2017S3  2018 07 03.94  Z  9.4  5.7
   2017S3  2018 07 04.03  Z  9.1 10


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#15 Randolph Jay

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Posted 06 July 2018 - 08:34 PM

Wow Uwe, so glad you got to sketch this before it fades!!  I knew about the outburst and wanted to check it as soon as possible, but I live in ...the clouds ( I wish I was back in the desert ).  Tomorrow night/morning might be clear and maybe it will still be at the tail end of this outburst.

Regards,

Randolph



#16 Aquarellia

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Posted 07 July 2018 - 12:11 AM

Are you guys observing before moonrise?

Yes I did, otherwise I had no chance.

 

Ok Uwe, I read in your interesting posts 2 magnitudes for July 7th : +9.1 and +9.9, mine was +10 with low precision.

and one diameter 10' with mine 15'.  I think that you are right with the gas expansion, so for the magnitude and so for the huge diameter.

So probably +9.1 is possible but with a so big diameter only similar and close DSO can give a comparison.

 

Michel



#17 frank5817

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Posted 07 July 2018 - 01:38 AM

No luck here ~ cloudy.

And it looks like I may be too late.

Excellent reports Uwe and fine sketch Michel.

 

Frank :)



#18 Uwe Pilz

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Posted 08 July 2018 - 01:12 AM

 Artyom Novichonok. wrote yesterday:

C/2017 S3 (PANSTARRS) dramatically changed after outburst. It becomes much diffuse and bigger quickly. Now it is not so easy object for 15-cm telescope as few days ago.

My visual observations below.

2018 07 03.85: m1=9.3, Dia.=3.5, DC=3/
2018 07 04.90: m1=9.1, Dia.=3.9, DC=2/
2018 07 05.90: m1=9.5, Dia.=4.3, DC=1/
2018 07 06.90: m1=9.8, Dia.=5, DC=0/

 

I observed the comet this night (July 7th 23:00 h UT = true midnight) again. I measured a magnitude of 11m1 and a diameter of 2 arcmins. The comet is less condensed now, and weaker of course.
 



#19 Uwe Pilz

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Posted 15 July 2018 - 06:09 AM

The comet hat a second outburst an brightened 2 mag in 24h. This was seen by many observers.


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#20 Uwe Pilz

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Posted 16 July 2018 - 11:50 PM

A friend of min saw it yesterday in a 8x40 binocular. Brightness is around 8 mag.


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#21 Heidescoper

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Posted 19 July 2018 - 02:12 PM

hi all,

 

here a sketch which showed the comet after the second outburst. 

The big dobson showed a short tail start in the east direction.

 

16.July 2018, 23:00 UT 

16" Dobson, V 75x

 

I  measured:  8.2mag, Diameter 3.8`, DC 4

My swanfilter showed more detail.

 

Bye

Christian

 

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#22 Special Ed

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Posted 19 July 2018 - 02:54 PM

Nice sketch, Christian.  smile.gif 

 

I finally saw it this morning with my 12x36 IS binoculars.  Report (but no sketch) is here.



#23 Uwe Pilz

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Posted 22 July 2018 - 11:27 PM

Dear observers, Michael Jäger showed two photographs of the comet, both form July 20th, one aroung 0h and oen 23h later. The comet lost it's tail and the coma is more than 1 mag weaker.



#24 SilentArtPhotography

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Posted 26 November 2018 - 10:28 AM

Hi Uwe, 

 

I recently registered to iTelescope and new to the astronomical community. 

I managed to take a few good shots (i think) of the 46P Wirtanen on the 25th Nov. 

I was checking how the weather is and can see a user named "Thomas Lehmann" trying to take a few shots (at the moment). Searching of this name on-line i came across this blog.. 

Unfortunately the weather does not look good for him. 

If you guys require and if would assist you in your works i can possibly share the images i took. 

Please let me know. 



#25 Uwe Pilz

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Posted 28 November 2018 - 12:35 AM

Dear Mehmet,

 

as you might know, I am the leader of the German comets group. We have a large archive of images, and Thomas is on of our most productive posters. I have seen that you sent first images to our archive too.
Beside this archive, I use such images for our German magazines "Sterne und Weltraum" and VdS-Journal"




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