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New transient in Monoceros (mag 10.4)

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#1 Aquarellia

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Posted 23 February 2019 - 05:42 AM

From Patrick SPK - (AAVSO)

Discovery details:

Discoverer: Shizuo Kaneko (Kakegawa, Shizuoka-ken, Japan)
R.A. 06h37m32.99s, Decl. -09°35'42.0" (J2000.0)
2019 Feb. 21.4516 UT, 10.4 mag (CCD, unfiltered)

My first visual estimation was done the date of the discovery : 21/2/2019 20h35 UT magn +10.4, then last night 22/2/2019 18:57 UTC magn +10.45.

This object(?) is easy to spot from every where (if weather cooperate) at the beging and until middle of the night.

Here is a sketch of the 30' field made yesterday:

Mon2019_l.jpg
Last information from AAVSO: Photometry and spectroscopy indicate that this object shows a UGWZ superoutburst.

 

More information here : https://www.aavso.or...4-mag-monoceros

Michel


Edited by Aquarellia, 23 February 2019 - 06:07 AM.

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#2 robin_astro

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Posted 24 February 2019 - 06:49 AM

The spectrum using an ALPY 600.

 

tcpj06373299-0935420_20190221_814_Leadbeater.png

 

Typical of a Dwarf nova in outburst (Very hot, the continuum fits to a 35000K Planck curve, with weak Balmer lines in absorption, H alpha is not obvious) 

 

 

Robin


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#3 Rich (RLTYS)

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Posted 26 February 2019 - 09:26 AM

Imaged this nova on the 2-25-19 with the SLOOH C1hm scope in Chile. Using comp stars 107 and 113, I estimated the nova's mag at 11.3. This nova is fading rapidly.

 

Rich (RLTYS)

Attached Thumbnails

  • TCP J06373299-0935420 C1hm 2-25-19.png

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#4 Rich (RLTYS)

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Posted 27 February 2019 - 09:54 AM

Once again I imaged this nova and estimated its magnitude. Using comp stars 113 and 121, estimated magnitude 11.7. The nova has the designation of ASASSN-19de.

 

Rich (RLTYS)


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#5 Rich (RLTYS)

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Posted 01 March 2019 - 01:06 PM

Continuing to monitor this Dwarf Nova as it continues to fade. As of 3/1/19 I estimated this nova at mag 12.0 using comp stars 117 and 124.

 

Rich (RLTYS)


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#6 vakulenko_sergiy

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Posted 07 March 2019 - 07:01 AM

It continues to fade. 12.4 cV mag at March 4 evening.

ASASSN 19de X3

Edited by vakulenko_sergiy, 07 March 2019 - 07:01 AM.

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#7 Aquarellia

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Posted 15 March 2019 - 01:05 AM

The magnitude drop is huge, last estimations gives between 15 and 16, so -3 mag in less than 3 days!

Far from any hub!

 

Have a look to this brand new very similar object in Auriga (m 13.5)

https://www.cloudyni...ient-in-auriga/

 

Clear sky to you all!

Michel


Edited by Aquarellia, 15 March 2019 - 01:12 AM.

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#8 Rich (RLTYS)

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Posted 15 March 2019 - 07:54 AM

Your right, I was just comparing images of this dwarf nova (ASASSN-19de) taken on 3/12 and last evening 3/15, she has faded considerably. Haven't done an mag estimate yet.

 

Rich (RLTYS)



#9 Aquarellia

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Posted 15 March 2019 - 11:50 AM

Your right, I was just comparing images of this dwarf nova (ASASSN-19de) taken on 3/12 and last evening 3/15, she has faded considerably. Haven't done an mag estimate yet.

 

Rich (RLTYS)

Hi Rich, I have a question...

I wonder, I'm not specialised in spectroscopy but are we sure that this object is a nova or a dwarf nova ???

There is a galaxy in the background and from my experience the curve is not a typical nova one,...

A friend of mine made some photos for the photometry process, he send me one of the picture and I made a rapid look at different sources as follows:

 

galaxy.jpg

 

So I wonder... is this really impossible that this transient would be a SN ?

Michel



#10 Rich (RLTYS)

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Posted 15 March 2019 - 11:55 AM

My brightness estimate as of 3/15/19, using comp stars 157 and 162 is 16.1. Here's a lightcurve for this Dwarf Nova.

 

Rich (RLTYS)

 

 

Attached Thumbnails

  • LightCurve.png


#11 robin_astro

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Posted 15 March 2019 - 12:12 PM

 

I wonder, I'm not specialised in spectroscopy but are we sure that this object is a nova or a dwarf nova ???

 

I routinely record and classify supernovae spectroscopically.  My spectrum of this object matches that of a dwarf nova, not a classical nova or supernova.  

https://www.cloudyni...4/#entry9169736

Additionally we know that this is a Milky Way object by the low redshift of the Hydrogen lines. 

 

Robin


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#12 robin_astro

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Posted 15 March 2019 - 12:16 PM

A sudden steep drop in brightness may indicate it is an eclipsing dwarf nova. 

 

Robin

 

EDIT:  unlikely as period is so short that several eclipses would already have been observed


Edited by robin_astro, 15 March 2019 - 12:21 PM.

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#13 Aquarellia

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Posted 15 March 2019 - 12:22 PM

Ok, thank you Robin, that's exactly the answer I was wating for!

Michel




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