Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

Optical outburst of the quasar CTA 102

  • Please log in to reply
155 replies to this topic

#51 Augustus

Augustus

    Fly Me To The Moon

  • *****
  • Posts: 10,656
  • Joined: 26 Dec 2015
  • Loc: Stamford, Connecticut

Posted 08 December 2016 - 08:17 PM

 

Is it visible in a 6" in suburban skies?

Probably not, the main issue is the lack of contrast because of the moonlight.

But you can try, the magnitude is changing so,...

Michel

 

Hmm, I'll try it next week when it's clear. Moon won't be a problem then.

 

Is it getting brighter?



#52 Dave Mitsky

Dave Mitsky

    ISS

  • *****
  • Moderators
  • Posts: 95,930
  • Joined: 08 Apr 2002
  • Loc: PA, USA, Planet Earth

Posted 08 December 2016 - 09:14 PM

It cleared up to a degree after my previous post.  I spent an hour trying to locate CTA 102 with the ASH 17" f/15 classical Cassegrain.  I used the finder chart in Bob King's S & T article and an AAVSO chart.  I believe I was in the right general area but the bright moonlight, marginal transparency, and small maximum TFOV (26') of the 17" made it difficult to know whether I actually saw the blazar or not. 

 

Dave Mitsky



#53 Dave Mitsky

Dave Mitsky

    ISS

  • *****
  • Moderators
  • Posts: 95,930
  • Joined: 08 Apr 2002
  • Loc: PA, USA, Planet Earth

Posted 08 December 2016 - 10:54 PM

I also looked at a few fall and winter DSOs tonight before calling it quits, including Cr 69, Cr 70, M15, M35, M42, M43, NGC 2158, NGC 2169, NGC 2261, and NGC 2392.  Most of them faired poorly due to the moonlight and poor-to-middling transparency.

 

I should mention that it was very windy and rather cold.  The wind chill was 20 degrees.

 

Dave Mitsky



#54 Aquarellia

Aquarellia

    Gemini

  • *****
  • Posts: 3,347
  • Joined: 27 Oct 2012
  • Loc: Artignosc, Provence, France

Posted 09 December 2016 - 12:37 AM

Hmm, I'll try it next week when it's clear. Moon won't be a problem then.

 

Is it getting brighter?

 

We can say yes, the last observation reported in the AAVSO data base gives for yesterday m= +12.73, as written in S&T we can  observe rapid variations in the quasar's light of up to 0.4 magnitude in the span of just two hours, it looks that we are in this status.

Herea my last sketch: http://www.cloudynig...-102/?p=7579084

Michel


Edited by Aquarellia, 09 December 2016 - 12:44 AM.


#55 GUS.K

GUS.K

    Viking 1

  • -----
  • Posts: 839
  • Joined: 13 Aug 2014
  • Loc: Katoomba, NSW, Australia.

Posted 09 December 2016 - 07:23 AM

Saw it tonight after a week of crap weather. The field was easy to find using the S&T map, and could just make out the 12.9 magnitude star in "the triangle". CTA 102 was  barely visible, but a little easier with averted vision, seemed to be just slightly fainter than the 12.9 mag star. Will try again after full moon, hopefully it's still within reach of my scope(10 inch f6). 


  • Aquarellia and bladekeeper like this

#56 ianstone

ianstone

    Explorer 1

  • -----
  • Posts: 87
  • Joined: 03 Sep 2016
  • Loc: Poland

Posted 09 December 2016 - 03:47 PM

Hope it will be still visible at the end of the month and some clear skies will finally come... Here cloudy 5th week in the row...

#57 nytecam

nytecam

    Voyager 1

  • *****
  • In Memoriam
  • Posts: 12,692
  • Joined: 20 Aug 2005
  • Loc: London UK

Posted 11 December 2016 - 05:29 PM

Recorded CTA-102 again tonight under bright gibbous moon and it appears to be holding steady - will post pic tomorrow :)

Nytecam

 

-----------------------------------------------

Here's my brief 5sec unfiltered shot from last night under gibbous moon [Vega/Deneb/Altair only naked eye city stars!] that does down to m18 [marked] and I estimate the blazar = ~m12.9 so holding steady :)

 

 

Attached Thumbnails

  • cta102q161211x5smg.jpg

Edited by nytecam, 12 December 2016 - 06:41 AM.

  • Procyon, herschelobjects, Susan H and 1 other like this

#58 hdahle

hdahle

    Lift Off

  • -----
  • Posts: 6
  • Joined: 15 Nov 2009

Posted 15 December 2016 - 07:32 PM

The latest photometry reported to AAVSO indicates a further re-brightening, to V=11.8 at December 15.71 UT. 


  • Dave Mitsky likes this

#59 GUS.K

GUS.K

    Viking 1

  • -----
  • Posts: 839
  • Joined: 13 Aug 2014
  • Loc: Katoomba, NSW, Australia.

Posted 16 December 2016 - 04:52 AM

Will give it another go tomorrow night, weather predicted to be good and moon doesn't rise till 11pm.



#60 Sasa

Sasa

    Mercury-Atlas

  • *****
  • Posts: 2,579
  • Joined: 03 Nov 2010
  • Loc: Ricany, Czech Republic

Posted 16 December 2016 - 01:05 PM

It is definitely there. Just saw it through 63mm Telementor. Hard to estimate the brightness for such threshold objects. It was definitely fainter than nearby V=11.0 and V=11.3 stars and easier than last time when it was of V~13.0 magnitude. So it could be around V~12.0 this time.


  • Dave Mitsky likes this

#61 Aquarellia

Aquarellia

    Gemini

  • *****
  • Posts: 3,347
  • Joined: 27 Oct 2012
  • Loc: Artignosc, Provence, France

Posted 16 December 2016 - 02:47 PM

Exact Sasa, I just post my visual estimations between 11.7 and 11.9, this was a surprise!

Michel


  • Sasa likes this

#62 herschelobjects

herschelobjects

    Vostok 1

  • -----
  • topic starter
  • Posts: 194
  • Joined: 12 Jan 2013

Posted 17 December 2016 - 12:41 PM

Latest on CTA 102: http://www.astronome....org/?read=9868



#63 BrooksObs

BrooksObs

    Gemini

  • *****
  • Posts: 3,350
  • Joined: 08 Dec 2012

Posted 17 December 2016 - 02:26 PM

Just as quickly as CTA 102 recently rose to a new brightness peak culminating at magnitude 11.8(V) on December 16th, it has just as quickly subsided back to a pre-flare visual magnitude of just below 13.0 as of December 17.79UT. This is now the second brief intense flaring for CTA 102, so perhaps these brightness spikes mark some sort of maximum in the object's current outburst intensity. Possibility a few more such brief flarings await us before the outburst begins its ultimate subside and exhibit a long slow decline back toward obscurity.

 

BrooksObs


  • Dave Mitsky, Sasa, Aquarellia and 1 other like this

#64 Aquarellia

Aquarellia

    Gemini

  • *****
  • Posts: 3,347
  • Joined: 27 Oct 2012
  • Loc: Artignosc, Provence, France

Posted 17 December 2016 - 02:50 PM

Indeed BrooksObs I'm just back from my observatory and my estimation was 13.0 at 19UTC

Michel


  • Cames and Sasa like this

#65 GUS.K

GUS.K

    Viking 1

  • -----
  • Posts: 839
  • Joined: 13 Aug 2014
  • Loc: Katoomba, NSW, Australia.

Posted 19 December 2016 - 07:54 AM

Had another look tonight and it seems as if the quasar has brightened, seemed brighter than the 12.9 mag star in the "triangle" ( S&T finder chart) at 10.30 utc 19th December.


  • Sasa and herschelobjects like this

#66 goodricke1

goodricke1

    Viking 1

  • -----
  • Posts: 646
  • Joined: 18 May 2013
  • Loc: Ireland

Posted 19 December 2016 - 04:17 PM

Good clear skies across Ireland this evening; estimated magnitude of 12.4 as at 1900 UT.


  • Sasa, herschelobjects and havasman like this

#67 Dave Mitsky

Dave Mitsky

    ISS

  • *****
  • Moderators
  • Posts: 95,930
  • Joined: 08 Apr 2002
  • Loc: PA, USA, Planet Earth

Posted 21 December 2016 - 12:24 AM

I gave CTA 102 another go on Tuesday evening with the 17" f/15 classical Cassegrain at the Naylor Observatory.  The conditions, which weren't ideal to begin with, deteriorated rapidly.  I'm fairly sure that I was at the right location and may have actually seen the blazar but not long after I acquired the field the sky clouded over. 

 

Through occasional breaks in the clouds I observed a very tiny Mars (apparent diameter 6"), a 61%-illuminated Venus, R Leporis, Sigma Orionis, Struve 761, M41, M42, M43, M47, M50, M78, M79, NGC 1980, NGC 1981, NGC 2244, NGC 2261, NGC 2264, and NGC 2301 before closing up the dome.

 

Perhaps I'll have better luck on Thursday night.

 

Dave Mitsky



#68 BrooksObs

BrooksObs

    Gemini

  • *****
  • Posts: 3,350
  • Joined: 08 Dec 2012

Posted 21 December 2016 - 09:33 AM

It would appear that CTA 102 is now undergoing  series of closely spaced flarings, having Monday night reached another brief new peak in brightness at 11.6 magnitude. As previously, this spike was immediately followed by the onset of a sharp decline in the object's brightness. It should prove most interesting to see just how long this violent oscillation phase will continue.

 

BrooksObs


  • Dave Mitsky, Aquarellia, herschelobjects and 1 other like this

#69 goodricke1

goodricke1

    Viking 1

  • -----
  • Posts: 646
  • Joined: 18 May 2013
  • Loc: Ireland

Posted 21 December 2016 - 03:37 PM

DSLR image from this evening Dec 21 at 1900 UT; I estimate mag 12.4

 

rw845x.jpg


  • Sasa and Aquarellia like this

#70 Aquarellia

Aquarellia

    Gemini

  • *****
  • Posts: 3,347
  • Joined: 27 Oct 2012
  • Loc: Artignosc, Provence, France

Posted 21 December 2016 - 04:55 PM

This evening Dec. 21 I just post two visual estimations made with a 6" refractor, (AAVSO) 12.6 @ 18:43 and 12.5 @ 19:25 UT.

Strange behavior, strange object...

Michel



#71 Sasa

Sasa

    Mercury-Atlas

  • *****
  • Posts: 2,579
  • Joined: 03 Nov 2010
  • Loc: Ricany, Czech Republic

Posted 21 December 2016 - 06:16 PM

Interesting reading about this blazar is here

https://books.google...utburst&f=false

Truly spectacular object.


Edited by Sasa, 22 December 2016 - 02:17 AM.

  • Dave Mitsky, Cames and Aquarellia like this

#72 Cames

Cames

    Apollo

  • -----
  • Posts: 1,018
  • Joined: 04 Aug 2008

Posted 21 December 2016 - 07:16 PM

Interesting reading about this blazar is here is

https://books.google...utburst&f=false

Truly spectacular object.

Thank you, Sasa, for giving us such a comprehensive reference. The combination of the in-depth info in your link combined with the complex behavior that has been reported and that we see with our own eyes has made this such a rich experience for me. What an amazing way to be introduced into the phenomenon of quasars!

 

In addition, the ongoing collaboration of observers in the CloudyNights community sharing in discussions of this type is a wonder of modern amateur astronomy. Just imagine if this event were taking place 30 years ago, when we had to wait for information to be published in an astronomy journal or magazine. We most likely would have missed the event altogether.  I have really come to appreciate these CN forums that Astronomics so graciously provides us and more so with each passing year.

----------

C


  • Dave Mitsky, Sasa, Aquarellia and 2 others like this

#73 Dave Mitsky

Dave Mitsky

    ISS

  • *****
  • Moderators
  • Posts: 95,930
  • Joined: 08 Apr 2002
  • Loc: PA, USA, Planet Earth

Posted 22 December 2016 - 10:17 PM

Well, I got skunked again. The sky has cleared a bit but I won't be doing any blazar observing tonight. It's supposed to be mostly clear later tonight and tomorrow prior to sunset.
 
Dave Mitsky
  • GUS.K likes this

#74 GUS.K

GUS.K

    Viking 1

  • -----
  • Posts: 839
  • Joined: 13 Aug 2014
  • Loc: Katoomba, NSW, Australia.

Posted 23 December 2016 - 07:18 AM

Good luck in seeing it Dave, it's worth the effort tracking it down. I'm still amazed that I can see an object 8 billion light years away with  a relatively small(8 inch) scope, and it will probably be the most distant object I will ever see. 



#75 BrooksObs

BrooksObs

    Gemini

  • *****
  • Posts: 3,350
  • Joined: 08 Dec 2012

Posted 23 December 2016 - 09:02 AM

Well, I got skunked again.  The sky has cleared a bit but I won't be doing any blazar observing tonight.  It's supposed to be mostly clear later tonight and tomorrow prior to sunset.

 

Dave Mitsky

 

Yup and just as I posted yesterday, it once again rapidly clouded up in the late afternoon yesterday - although predictions were for it to be clear over night - and remained so until at least midnight. Thereafter it was probably clear the rest of the night since sunrise occurred in a beautiful clear blue sky this morning.

 

The forecast is for clear all day today...right up until sunset, when it is predicted to become cloudy once again over night! This has been the ongoing story of this December for me and to say the least , it is most unusual.

 

BrooksObs.




CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics