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Possible nova in Aquila, 31 May 2013

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#1 RobK

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Posted 31 May 2013 - 07:19 PM

New possible nova PNV J19150199+0719471 in Aquila discovered by veteran nova hunter Koichi Itagaki, Yamagata, Japan. Mag 10.8 at discovery, several confirmations posted but needs a spectrum.
http://www.cbat.eps....99 0719471.html
http://www.aavso.org...-nova-en-aquila

Cheers -

Rob

#2 RobK

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Posted 31 May 2013 - 09:41 PM

Hmmm, B & V follow-up photometry by Enrique de Miguel suggests that it might be too blue to be a classical nova, possibly a dwarf nova?? This was posted to vsnet-alert by Taichi Kato.

Rob

#3 Rich (RLTYS)

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Posted 01 June 2013 - 06:56 AM

Rob, thanks for the info. Will try to observe this object if the weather cooperates.

Rich (RLTYS)

#4 RobK

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Posted 02 June 2013 - 11:11 AM

Looking like it will be a dwarf nova but still awaiting spectrum. An early reported time series on it appeared to show evidence of superhumps. Anyway, I managed to image it tonight, very close to another star (dimmer) at this scale

Cheers -

Rob

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#5 robin_astro

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Posted 03 June 2013 - 07:50 PM

Looking like it will be a dwarf nova but still awaiting spectrum.
Rob


Hi Rob,

Here you go
http://www.spectro-a...c.php?f=5&t=607

Amateur spectra from a variety of locations including a team using IAC80 Tenerife for a campaign on WR stars, the centre of Paris and mine from NW England where it does not get dark at this time of year.

Robin

#6 RobK

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Posted 03 June 2013 - 10:01 PM

Great job Robin!

Rob

#7 BrooksObs

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Posted 04 June 2013 - 03:18 PM

Further spectra indicates that the object is clearly a dwarf nova, probably of the UGWZ class. These objects, once thought to be excedingly rare, are being discovered in considerable numbers recently.

BrooksObs

#8 brianb11213

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Posted 04 June 2013 - 03:59 PM

These objects, once thought to be excedingly rare, are being discovered in considerable numbers recently.

Yeah ... when the intervals between outbursts is measured in decades & the outbursts don't last long, it's going to take a considerable time of high quality survey work to find a significant proportion of them ... I guess the numbers are going up simply because the surveys are getting more complete, deeper & have been going longer.

"Exceedingly rare"? Well, maybe not, but the number visibly in outburst at any particular time remains small.

#9 nytecam

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Posted 06 June 2013 - 06:18 PM

My pic from tonight May 6 below - on the Sloan DSS there's a faint blue star at this location :grin:

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#10 RobK

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Posted 07 June 2013 - 05:33 AM

Nice job Nytecam!

Rob

#11 BrooksObs

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Posted 07 June 2013 - 10:47 AM

" 'Exceedingly rare'? Well, maybe not, but the number visibly in outburst at any particular time remains small."

No, exceedingly rare definitely was the proper term to use in regard to these stars for many decades. For most of my very long observing career with AAVSO only a handlful of these objects had been positively identified.

BrooksObs

#12 Rich (RLTYS)

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Posted 08 June 2013 - 06:58 AM

Took this image this morning 6-8-13 with the Slooh Remote Observatory.

Rich (RLTYS)

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#13 Rich (RLTYS)

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Posted 10 June 2013 - 07:54 AM

I estimated this PNV at mag 11.9.

Rich (RLTYS)

#14 RobK

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Posted 12 June 2013 - 03:35 AM

Now a CBET has been issued, officially confirming it as a dwarf nova.

CBET 3554 : 20130611 : DWARF NOVA IN AQUILA = PNV J19150199+0719471
http://www.cbat.eps....ecentCBETs.html

Rob

#15 nytecam

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Posted 14 June 2013 - 04:18 PM

My 60s pic in late twilight from last night June 13 @ 2200UT :rainbow:

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#16 Rich (RLTYS)

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Posted 16 June 2013 - 07:49 AM

Imaged PNV J19150199+0719471 last evening (6/15) with the Slooh Remote Observatory and it has definitely faded. I'd estimate its mag at 12.5.

Rich (RLTYS)

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#17 Rich (RLTYS)

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Posted 18 July 2013 - 06:58 AM

Imaged PNV J19150199+0719471 last evening (7/16) with the Slooh Remote Observatory and it continues to fade. This dwarf nova has faded to about 16th magnitude.

Rich (RLTYS)

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#18 nytecam

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Posted 19 July 2013 - 02:28 AM

Hi Rich - thanks for the heads up. My unfiltered shot from last night I estimate mag ~16.9 against Sloan DSS [inset below].
The blue star seems a favoured candidate but is in the wrong place! - unless proper motion between epoch dates ie mine and Sloan. A second much fainter [mag 20?] candidate is marked but again is slightly displaced. Has a precurser been identified ? :grin:

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#19 Rich (RLTYS)

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Posted 19 July 2013 - 05:14 AM

It's definitely the brighter blue star. The AAVSO LCG shows this dwarf nova between 16th and 17th mag. It seems after my previous observation (6/26) the nova suddenly faded quite a bit.

Rich (RLTYS)






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