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Bright Nova in Cygnus

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#26 KMA

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Posted 10 August 2019 - 05:19 AM

Yes indeed!

and here is a little downer

after this morning obs...

best regards

KMA

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  • 2104+47k-UG  20190810.png

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#27 Aquarellia

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Posted 10 August 2019 - 05:28 AM

Correct. Tonight my visual estimation gives +12.75 posted in AAVSO.



#28 Rich (RLTYS)

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Posted 12 August 2019 - 08:52 AM

Yes indeed!

and here is a little downer

after this morning obs...

best regards

KMA

The important thing is that you caught it.



#29 KMA

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Posted 12 August 2019 - 01:47 PM

Thanks.

I may actually check this object more often

after I realized it is pretty close to one of my favorite

V407 CYG.

Here is what happened in 2010.....

best regards

KMA

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  • V407 CYG  date.png

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#30 KMA

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Posted 15 August 2019 - 04:54 AM

And it was a good decision

this early morning I caught the nova

at visual magnitude 11.8mV.

Later on instrumental magnitude report

confirmed my report.....

best regards

KMA

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  • 2104+47k-UG  20190815b.png

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#31 Aquarellia

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Posted 15 August 2019 - 04:01 PM

Indeed, I just made my observation +11.9

here the last 20 days:

1B448971-6146-4210-861A-3B13CD3A2C6F.jpeg

But what's happen there???

Michel


Edited by Aquarellia, 15 August 2019 - 04:03 PM.


#32 robin_astro

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Posted 15 August 2019 - 04:47 PM

 

But what's happen there???

Michel

The outbursts in dwarf novae are caused by instabilities in the accretion disc.  Rebrightenings following super outbursts are often seen in particular types of dwarf novae.  Observations up to the first rebrightening are discussed here in this ATel.  (Several of the authors are amateurs) 

http://www.astronome...org/?read=13009

 

Robin


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#33 KMA

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Posted 16 August 2019 - 10:04 AM

Thanks for all contributions and comments 

from everybody on this subject.

Very nice.

As far as my observation goes

this morning another rather fast decline....

best regards

KMA

Attached Thumbnails

  • 2104+47k-UG  20190816.png

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#34 Aquarellia

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Posted 20 August 2019 - 08:11 AM

The outbursts in dwarf novae are caused by instabilities in the accretion disc.  Rebrightenings following super outbursts are often seen in particular types of dwarf novae.  Observations up to the first rebrightening are discussed here in this ATel.  (Several of the authors are amateurs) 

http://www.astronome...org/?read=13009

 

Robin

Super Robin

What an interesting ATel !!!

The spectroscopy and precise photometry showing superhumps and suggesting short orbital period are facinating

However the short orbital period is not reflecting in the light curve.  Ilagine this star is at the distance of our sun, so I was wondering how can I sketch the look and feel of this behavior ?

Because of the distance, a sketch is possible via imagination, but ofcourse not a photo grin.gif !

 

Thank you a lot for your link.

Michel



#35 robin_astro

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Posted 20 August 2019 - 09:32 AM

Hi Michel,

 

I have to be a bit careful here as I am not a CV expert but the orbital period of the system (a white dwarf accreting material from a companion star via an accretion disc) was measured spectroscopically to be 77 minutes.  Similar but slightly longer periods were also found in the photometry (The superhumps) These are caused by localised distortions (hot spots)  in the disc during the outburst, the rotation of which is locked into resonance with the orbital period of the system. (The superhump period is slightly longer than the orbital period due to precession of the disc).  Note these superhumps are much smaller in magnitude and timescale than can be seen in the AAVSO light curves here. You need high cadence precision photometry to see them, as typically measured by members of the Centre for Backyard Astrophysics for example 

https://cbastro.org/

 

What causes the rebrightenings is not clear (to me at least!) though they seem to be caused by further instances  of instability and mass transfer within the disc following the main one.

 

Robin


Edited by robin_astro, 20 August 2019 - 09:40 AM.

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#36 Rich (RLTYS)

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Posted 24 August 2019 - 08:08 AM

My latest mag estimate of TCP J2104.... is 14.0 using comp stars 140 and 147 on 8-22-19.

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  • TCP J2104 Lightcurve 8-24-19.png

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#37 KMA

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Posted 25 August 2019 - 09:43 PM

Nice Sunday evening surprise 

best wishes

KMA

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  • 2104+47k-UG date 20190826.png

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#38 Aquarellia

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Posted 25 August 2019 - 11:38 PM

Nice Sunday evening surprise 

best wishes

KMA

That's funny, just some minutes (21h57 UTC) before your visual estimation I did mine: 12.6.

Michel



#39 KMA

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Posted 26 August 2019 - 06:37 AM

LCG I just posted also show
negative observations
which is rather confusing.
Here is a correct one.
Sorry bout this....
KMA

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  • 2104+47k-UG 20190826a.png

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#40 Aquarellia

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Posted 27 August 2019 - 02:57 AM

Here the same curve but with my estimations

aavso20190827.jpg

 

Terribly sorry, but I really feel better with the old LCG (1) than the new AAVSO one...

Michel



#41 KMA

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Posted 28 August 2019 - 01:24 AM

After one night rain wind and clouds
this evening weather improved
just at right time....
best wishes
KMA

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  • 2104+47k-UG  20190828.png


#42 KMA

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Posted 30 August 2019 - 05:50 AM

What a disappointment
nova is declining again...
best regards to all
KMA

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  • 2104+47k UG 20190830.png


#43 Rich (RLTYS)

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Posted 30 August 2019 - 09:29 AM

I observed J2104 on the 28th and estimated its mag at 11.0. Here's a light curve, including my observations. This dwarf nova is most interesting.

Attached Thumbnails

  • TCP J2104 Lightcurve 8-29-19.png


#44 KMA

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Posted 31 August 2019 - 05:48 AM

Sending my observations-reports to
AAVSO since 1976
I do not remember ever to have this kind
of weather luck.
The nova continues to decline...
best regards
KMA

Attached Thumbnails

  • 2104+47k UG 20190831.png


#45 KMA

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Posted 03 September 2019 - 05:31 AM

Finally clouds did go away
and nova almost too...
Waiting what instrumental guys will report...

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  • 2104+47k  20190903b.png

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#46 Rich (RLTYS)

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Posted 04 September 2019 - 08:48 AM

My latest observation of this interesting Dwarf Nova puts its magnitude at 13.8. Whats really neat is if you skim down this page and look at all the lightcurves it almost looks like a movie showing the continual brightness changes of this variable.

Attached Thumbnails

  • TCP J2104 Lightcurve 9-4-19.png

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#47 Aquarellia

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Posted 17 September 2019 - 12:21 AM

It's not the end, I observed a new up sept. 16th

Michel



#48 KMA

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Posted 17 September 2019 - 06:27 AM

Unfortunately I was clouded out
for 15 and 16 Sep.
Thanks for info
KMA

#49 Rich (RLTYS)

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Posted 17 September 2019 - 06:35 AM

I imaged it on the 14th but haven't had a chance to look at it. I hope to image it again tonight. I fear I might have missed this latest outburst.bawling.gif




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