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Bright (6.8U) possible nova in Del?

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Patrick Schmeer alerted us via several lists and facebook groups that K. Itagaki discovcered a bright possible nova in Delphinus:

PNV J20233073+2046041

PNV J20233073+2046041 2013 08 14.5843* 20 23 30.73 +20 46 04.1 6.8 U

more info: http://www.cbat.eps.harvard.edu/unconf/followups/J20233073+2046041.html

Discovered by Koichi Itagaki,
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Discovered by Koichi Itagaki, Yamagata, Japan, using 0.18-m reflector + unfiltered CCD. This Nova was confirmed on the frames taken on August 14.750 UT using 0.60-m f/5.7 reflector + unfiltered CCD after discovery. Then CCD magnitude is 6.3. Also nothing is visible at this location on his past frames (limiting mag.= 13.0) taken on 2013 August 13.565 UT.

Itagaki's image :
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Just visualy observed it and
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Just visualy observed it and estimated it 6.5.  AAVSO chart 12506UL 

Compstars 62 and 70.

Easy visible in 8x42 bino.

Nova del
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Hi all,

i am making pictures of this star now in BVR

Laurent

Hi all I hope I got the
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Hi all


I hope I got the right thing ....

Bino Chart created with VSP
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For those who'd like to just grab it quickly and not create another one.

Jim

Nova
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Great, will get right on this as son as dark here,

Its still brightening it appears!

Mario

Prelim. estimate from my
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Prelim. estimate from my images now is 6.2 +-0.1mag, so not that much brighter than the 6.3 mag reported in the confirmation (see link in thread starter) for August 14.750 UT. Looks like clouds are closing in on me now :-( Good luck everyone CS HB

My visual estimate: 6.0 at
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My visual estimate: 6.0 at 00:50 UT 15 August using AAVSO chart 12506SZ.

/Gustav, HGUA

m(vis) = 6.1
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My visual estimate is 6.1 using comps from BSC (59 and 63).
An image is available at this: http://www.geocities.ws/costeira1/img/ndel2013_20130815_0005.jpg

Nova Del 2013
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Here is one of the V-band BSM_Berry images of the nova.

Arne

V-band magnitudes
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Here are my first photometric V-band estimates under not so good sky conditions. A rise in magnitude can be seen...

6.3 vis tonight
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Visual magnitude estimate  2013 Aug 15.025 UT 6.3.
Instrument: 20x60 binoculars

Nova Delphinus
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This will be my first officlal report, so no gurantees, but I'd put it at 6.1 or so, based upon comparison to nearby stars.

Good to be on board.

-RRL

Newcastle Observatory via Twitter
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Newcastle Observatory via Twitter reported Nova PNV J20233073+2046041 in Delphinus now at Bmag 6.117 +/-0.014, and Vmag 5.920 +/- 0.004

I just made a visual estimate
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I just made a visual estimate @ 6.0 with 10x50 binoculars. 

Nova Del is apparently still
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Nova Del is apparently still rising, judging by earlier reported mags and my two observations of this evening.

Aug. 15.0576  5.9

Aug. 15.1431  5.7

J.Bortle    (BRJ)

 

At 0500UT, it seemed clearly
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At 0500UT, it seemed clearly brighter than the 5.7 comp star the plotter is showing next to it.  I put it at 5.4.  35mm binoculars.  Glen

nyc obs..
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saw it in NYC.  Agree with the ~6.0 visual at 1:35 EST.   very clear night...

The nova appears brighter
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The nova appears brighter than the brightest compstar on the AAVSO chart.

 

I think it's urgent to put some brighter compstars on the chart.

Brighter comps
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This 20 degree chart, 12508ANJ, has plenty of brighter comps.

AUID
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Observations may be entered under AUID 000-BLC-933.

Thanks.
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Thanks.

And what about those who are
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And what about those who are entered under PNV J20233073+2046041?

000-BLC-933 = PNV J20233073+2046041
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They are linked under that AUID.  It's just easier to type. :-)

Science fom Nova Del 2013
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I was wondering about dstance and possible peak magnitude we could expect from this. I found a distance estimate of 1 Kpc here:http://www.astronomerstelegram.org/?read=5283

Should we expect this to reach N Sco 2007 brightness? (3.9)

Or is N 1975 Cyg brightness in the realm of possibility? Too early to tell?

According to this  http://en.wikipedia.org/wiki/V1500_Cygni; Nova Cyg 1975 was twice as far away (If the above 1Kpc estmate is reasonable.

Does anyone know what kind of nova we have? (Fast , Slow, He, Fe)?

If so how do you know?

-----Andy

Do not know the answers to
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Do not know the answers to your questions, but a few minutes ago I made it at 5.0 mag in my 10x50 binoculars and saw it easily with naked eye.

5.1 using 6x30 at 20:41 UT,
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5.1 using 6x30 at 20:41 UT, 15 August.

/Gustav

I also have seen it with the
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I also have seen it with the naked eye.  Visual estimation was done by 8x42 bino.  Magnitude 5.1   2013/08/15  at 20.45 UT.

N Del 2013
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This is already a big deal, and may even be a bigger deal.

Playing with this Magnitude calculator and plugging in numbers: http://www.1728.org/magntudj.htm

Using 1Kpc = 3200 LY as from http://www.astronomerstelegram.org/?read=5283

From wikipedia and cited paper----Common peak Absolute mags for classical novae are what they call bimodal. Most are -7.5M and a second common brightness is -8.8

Robert, Gilmozzi; Della Valle, Massimo (2003). "Novae as Distance Indicators". In Alloin, D.; Gieren, W. Stellar Candles for the Extragalactic Distance Scale. Springer. pp. 229–241. ISBN 3-540-20128-9

Using the above Absolute mag calculator, I get 2.5V peak for the -7.5group and a whopping 1.2V! for the -8.8 group! (Extinction not accounted for)

This sort of rare thing , seems unlikely to me. The principal of Occum's Razor would suggest that this may too optimistic. I make some assumptions. Info coming out is only as good as data going in.

Any toughts?

Still rising visually
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Well skies have cleared now here in Ireland, I've just taken a look at it with my 15x70mm binos, visually I now estimate this nova at magnitude 4.8, I can easily see it with the naked eye under excellent clear skies.

I hope that you are right and this gets even brighter !

Keith..

Distance not yet known
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Hi Andy.  Thanks so much for your thoughtful questions.

 

Actually, the authors of ATel 5283 did not quote a distance -- they

just used a fairly arbitrary distance-scaling of 1 kpc to report an

X-ray luminosity (as is often done).

 

The E-Nova collaboration has triggered radio observations, and once

these are performed, they will provide a good first distance estimate.

This is because the radio flux density is proportional to the size of the

ejecta, modulo the distance, and we know the size of the ejecta from

published velocities muliplied by the time since the start of the

eruption.

 

Once we have a good distance estimate, we will be able to have a

better sense of how bright this nova might get (assuming that it has

not already started to fade by then!).

 

All the best, from Chalkidiki, Greece,

 

Jeno

Heres's a spectrum of this
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Heres's a spectrum of this nova

ARAS Spectra are gathered on web page : http://www.astrosurf.com/aras/Aras_DataBase/Novae/Nova-Del-2013.htm

N Del 2013
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Hi again, Andy.  It looks like you are finding all the right references and doing all the right calculations!

Now, we just need to get a good distance and extinction... :)

- Jeno

N Del 2013
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I just got it at V  4.727 (0.005) on 16/8 1:00 UT, starting at 4.900 on 15/8 22:47 UT. It steadily brightens, no slope decrease in view ! 

Clear Skies !

Roger

An interesting nova and the
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An interesting nova and the first in a long time that I recall seeing distinctly with the unaided eye. I concur with others that the nova continues to slowly brighten. I obtained 4.8 with the unaided eye using multiple comp stars on August 16.0743UT, a full magnitude above what I got last evening. The nova's slow, but steadily continuing  increase in brightness hints at a "relatively slow" nova to me and I will be extremely interested to see more pre-discovery magnitudes come to light.

J.Bortle   (BRJ)

Nova Del 2013 near 4.5 visually
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Observing through hazy skies in Denver, Nova Del appears brighter than nearby 4.8 mag star, 29 Vul.

Nova has orange appearance (H-alpha) and may appear slightly brighter (Purkinje effect).  Observation at 2145MDT 15-Aug-2013 = JD 2456520.6645.  SVR.

Nova Del 13 still rising
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4.6 and easily visible naked eye in urban Honolulu.  How high will it go?

Still rising
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Mag 4.4  at 0820 UT using binoculars, though can be seen naked eye as well.

N Del 2013
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Imaged last evening with iTelescope T18 in V for 90 seconds.

V = 6.243, with error = 0.001, airmass = 1.0782. Check star=98, Comp star = 100.  All data from VPHOT.

Tried to get a nice color image this morning but everything was down...I'll try again later.

Also will try to image over the next several days/weeks to see what happens.

What has surprised me greatly
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What has surprised me greatly regarding this nova is the lack, at least so far, of almost any pre-discovery observations. We have just gone through the peak of the Perseid meteor shower occurring during a virtually moonless period. One would usually anticipate that large numbers of amateurs would have been out taking wide-field images of the sky in hopes of capturing meteors. Cetainly, many would have covered this region of the sky. Yet, all we seem to have are two strongly conflicting datapoints pre-discovery so far. And where are the reports from those known to be carrying out amateur nova photo patrol programs this time?

I do appreciate that it is still early, but past such events generally have quickly produced a number of early sightings. Cetainly, the nova's observed behavior so far could suggest that its rise in brightness in the days just prior to discovery may not have been as abrupt and steep as might have first been assumed. Perhaps over the coming weekend, as folks have an opportunity to go over their Perseid images more, some new information will surface?

In the meantime, I think we may be in for quite a show from Nova Del.

J.Bortle   (BRJ)

  

T18
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Hi daveh,

Anytime I see a formal error of 0.001, I assume two things.  First, this is purely Poisson error, which does not reflect real error.  You need to at least compare (C-K) and take ~3 readings to get an uncertainty.  Second, 0.001 Poisson error almost always means saturation.  You indicate 90 seconds of exposure: was this all at one time?  If so, you were dramatically overexposed.  Note that your V=6.2 measure is very different than everyone else's at the same time.  Give us details of your observation.

Arne

T18
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Arne,

Yes, you're right.  It was just a very quick target of opportunity last night and it was definitely oversaturated.  I just thought I would post results, but I should have mentioned this...sorry.

 

Dave

Re: What has surprised me greatly
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Hi John,

Frans Van Loo (VNL), Genk, Belgium, has captured the field on Aug. 13th at 23h05m 25 s UT using a Nikon D3100 DSLR + 18-55mm zoom lens at 18-mm-f.l. in the course of the Perseid observations.

His image shows the nova slightly brighter than the image background. Although a decent measure is impossible, the brightness estimated from this image is about magnitude 8. The 8th magnitude star just NW of the nova is also visible. Frans did report his observation to the AAVSO and is shown in the LCG, but is indeed conflicting with the ~5.2 observation which is also shown.

Another image captured by Guiseppe Cannonaco, Genk, Belgium, has been taken on Aug. 13th, at 20h41m53s does not show the nova. The limiting magnitude of the image is however about magnitude 7.5.

I am wondering whether the ~5.2 magnitude datapoint shown in the LCG has a typo in the date or magnitude.

We are also eagerly looking forward to more pre-discovery images. Indeed, one could expect that other observers of the Perseid meteor shower have captured the area.

 

Best Regards,

Eric Broens (BOS)

Pre-discovery observations of Nova
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BRJ wrote:
What has surprised me greatly regarding this nova is the lack, at least so far, of almost any pre-discovery observations. We have just gone through the peak of the Perseid meteor shower occurring during a virtually moonless period. One would usually anticipate that large numbers of amateurs would have been out taking wide-field images of the sky in hopes of capturing meteors. Cetainly, many would have covered this region of the sky. Yet, all we seem to have are two strongly conflicting datapoints pre-discovery so far. And where are the reports from those known to be carrying out amateur nova photo patrol programs this time?

Hello,

I've taken some pictures from 13/14 August taken at 21:20 (GMT) and I couldn't find this Nova. It was fainter than 10.2 mag. at that time and I added this observation to AAVSO database.

I've found some more pictures (where Nova's position was close the edge of photo) taken 10 minutes later and Nova was fainter than 10.6 mag. I'll add this to the database too, might be useful.

Regards,

libmar96

Nova Del - prediscovery image
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Attached is an image of this region taken by Johan Smit in Sout Africa on 8th August.

 

Dave

PEPV Comparisons
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Has anyone done PEPV photometry for this target?  If so could you suggest some comparison stars.  It would be useful if we are all using the same ones for consistency.

 

I've written a couple of blog
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I've written a couple of blog posts about the nova.

  1. http://dbenn.wordpress.com/2013/08/16/nova-delphinus-2013
  2. http://dbenn.wordpress.com/2013/08/15/possible-nova-in-delphinus

What an exciting object!

David

C. Jacques image
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Cristovao Jacques (Brazil) took an image in 2013 Aug. 14.095 UT and N Del was fainter than 11.2 , using Tycho-2 comps.

A crop animated gif, including another image taken in 2013 Aug. 17.089 UT, is available at this link: http://www.ceamig-rea.net/nova/nova.gif

The whole animated gif is at link (3 Mb)
http://www.ceamig-rea.net/nova/NOVA_NOCROP.gif

Bright nova in Delphinus - animation
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