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Observing >> Variable Star Observing and Radio Astronomy

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NJScope
sage
*****

Reged: 03/08/04

Loc: NJ
Re: New nova in delphinus new [Re: Dean Norris]
      #6091306 - 09/20/13 08:59 AM Attachment (29 downloads)

Here's the latest spectrum (19Sept2013) from Nova Del 2013 which continues to show dominant Balmer emission lines (Halpha, Hbeta, Hdelta and Hgamma).

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SStoffer
member


Reged: 04/15/11

Loc: Grand Rapids, Michigan
Re: New nova in delphinus new [Re: NJScope]
      #6096156 - 09/23/13 01:33 AM

Long time, no see everybody! I had a very active summer observing just about everything. And the biggest event happened for me on August 16 with Nova Delphinus.

I have followed this nova for the past month because it is the first one I have ever seen. I finally got a chance this evening to observe it to see its color. It is red indeed as the spectrum in the last posting on this thread shows.

However, I was expecting it to be an even a deeper red. Can these novae appear like carbon stars when fading, at least part of the cycle? I sure would like someone else to answer this question.

Observing this object brings back memories when I had a chance in 1975 to see Nova Cygni. It was so notable an event our local weatherman one evening on television said there was a new star in the heavens. Unfortunately, he provided no chart to find it. Lack of current information (no internet in those days) available caused me to miss seeing it. If I only had been patient and used a star chart I could have easily seen it since it was so bright and near Deneb. I hope to live to see one that bright again.

-Stephen


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SStoffer
member


Reged: 04/15/11

Loc: Grand Rapids, Michigan
Re: New nova in delphinus new [Re: SStoffer]
      #6096228 - 09/23/13 03:20 AM

On a second thought, since my mirror fully cooled down and star images are more focused, it does seem to appear as a carbon star. And staring at it makes it appear less red.

It is around magnitude 8.

-Stephen


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BrooksObs
professor emeritus


Reged: 12/08/12

Re: New nova in delphinus new [Re: SStoffer]
      #6096585 - 09/23/13 10:47 AM

"Observing this object brings back memories when I had a chance in 1975 to see Nova Cygni. It was so notable an event our local weatherman one evening on television said there was a new star in the heavens. Unfortunately, he provided no chart to find it. Lack of current information (no internet in those days) available caused me to miss seeing it. If I only had been patient and used a star chart I could have easily seen it since it was so bright and near Deneb. I hope to live to see one that bright again." -Stephen

Might be a long wait. Although they occur quite randomly, there has been a decided lack of novae of 1st magnitude or brighter since the early 1940's. In fact, Nova Cygni in '75 is the sole example since I started observing back in the mid 1950's!

BrooksObs


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Special Ed
Postmaster
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Reged: 05/18/03

Loc: Greenbrier Co., WV 38N, 80W
Re: New nova in delphinus new [Re: BrooksObs]
      #6097557 - 09/23/13 10:23 PM

Hi,

Nova Del 2013 O210 24 September UT ~7.8 mag seeing and transparency above average. No moon. 12x36 IS II binoculars. No color noted at this magnification.


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John_G
sage


Reged: 01/18/10

Re: New nova in delphinus new [Re: Special Ed]
      #6099463 - 09/24/13 10:40 PM

About 3 weeks since may last observation. My estimate tonight with my 90mm was 8.2 with comp stars 80 and 82, 9/25/13 at 2:00 UT. I didn't notice any red color that some have reported.

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Sasa
professor emeritus


Reged: 11/03/10

Loc: Ricany, Czech Republic
Re: New nova in delphinus new [Re: John_G]
      #6099721 - 09/25/13 03:01 AM

My estimate from the same evening using 8x40 binoculars is the same:

9/25/2013 18:25UT V=8.2

BTW, here is the nova light curve based on my observations. One can clearly see a change in the trend:



Edited by Sasa (09/25/13 03:01 AM)


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Rich (RLTYS)Moderator
Post Laureate
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Reged: 12/18/04

Loc: New York (Long Island)
Re: New nova in delphinus new [Re: John_G]
      #6099804 - 09/25/13 06:24 AM

Quote:

About 3 weeks since may last observation. My estimate tonight with my 90mm was 8.2 with comp stars 80 and 82, 9/25/13 at 2:00 UT. I didn't notice any red color that some have reported.




Observed N Del 2013 last evening (9/24) and estimated its mag at 8.0. I did take a good look at the nova with my 10" refl and at 38x I didn't see any color but when I increased magnification to 76x N Del took on a pale orange color.

Rich (RLTYS)


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Sasa
professor emeritus


Reged: 11/03/10

Loc: Ricany, Czech Republic
Re: New nova in delphinus new [Re: Rich (RLTYS)]
      #6102554 - 09/26/13 03:32 PM

Today I had a quick look at nova. It was between the clouds, but I had a feeling that it is much fainter than two days ago, may be the speed of fainting again changed. My estimate is

9/26/2013 18:55UT V=8.5


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John_G
sage


Reged: 01/18/10

Re: New nova in delphinus new [Re: Sasa]
      #6103191 - 09/26/13 10:48 PM

I had a look tonight with my 200mm. I didn't make an estimate but the color red was easy to see. As red as a lot of carbon stars I've seen.

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lamplight
Carpal Tunnel
*****

Reged: 09/18/12

Loc: western MA, U.S.
Re: New nova in delphinus new [Re: John_G]
      #6103422 - 09/27/13 01:46 AM

I noticed the red three days ago after not having seen it for a couple weeks. I was not expecting it, just was looking to do some practice magnitude evals (just starting, noob). Two nights ago when the seeing was not so good the outer red edge seemed far wider than the last two nights. I Get the sense, perhaps imagination, that the red is oozing into the black background.. Like its bigger than I can see. I wish I could see this through the Hubble or from somewhere free of atmosphere at higher magnification. I see a yellow white pinpoint center with this red surrounding it.. (All three nights in las 4 days). As I say, A couple of days ago the red part was larger, more visible. There was also more flicker so I'm not sure if it was just illusion.

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John_G
sage


Reged: 01/18/10

Re: New nova in delphinus new [Re: lamplight]
      #6114669 - 10/03/13 08:03 AM

I had a look last night with my 200mm. Still somewhat red in appearance but not as intense as my last observation. My estimate was magnitude 9.0 with comp stars 90 and 95 at 2:00 UT 10/3/13.

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Rich (RLTYS)Moderator
Post Laureate
*****

Reged: 12/18/04

Loc: New York (Long Island)
Re: New nova in delphinus new [Re: John_G]
      #6116603 - 10/04/13 06:18 AM

Maybe this is old news but Nova Del 2013 finally has a designation, it's V339 Del.

Rich (RLTYS)


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canukLX90
professor emeritus


Reged: 12/25/08

Loc: B.C. Canada
Re: New nova in delphinus new [Re: John_G]
      #6117713 - 10/04/13 05:42 PM Attachment (24 downloads)

Image from the night of 03 October.
10 X 30 seconds at ISO 800 / modded Canon 450D / PowerNewt
at F 2.8 No processing other than RAW to TIFF conversion,
crop and stacking.

Still looks red but dimmer than my last posted image.

PJ


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A. Viegas
scholastic sledgehammer
*****

Reged: 03/05/12

Loc: New York City/ CT
Re: New nova in delphinus [Re: canukLX90]
      #6119021 - 10/05/13 12:58 PM Attachment (21 downloads)

Here is an image from August 25th-- just to note the magnitude difference....

CPC1100 at ~F5.5 - Mallincam Xtreme 1 single 60 second exposure. No processing, just a screen capture.

Al


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nytecam
Postmaster


Reged: 08/20/05

Loc: London UK
Re: New nova in delphinus new [Re: A. Viegas]
      #6141432 - 10/16/13 06:02 PM Attachment (17 downloads)

My first shot tonight [Oct 16] of Nova Del for some weeks - data on image. It's faded noticeably - my est. m10.2 Inset 3s exp in hi-colour saturation shows a pink/reddish hue

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canukLX90
professor emeritus


Reged: 12/25/08

Loc: B.C. Canada
Re: New nova in delphinus new [Re: nytecam]
      #6144922 - 10/18/13 01:37 PM

It will be interesting to see how low it will go!
With the earlier onset of nightfall it will be possible to
keep tabs on the nova as it moves further to east with each
passing day.

F2.8 with the 30cm! That must be some reducer (:

PJ


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brianb11213
Postmaster
*****

Reged: 02/25/09

Loc: 55.215N 6.554W
Re: New nova in delphinus new [Re: canukLX90]
      #6145337 - 10/18/13 06:08 PM

Quote:

It will be interesting to see how low it will go!



Apparently the pre-outburst magnitude was around 17.1 (V) (from survey images) & since the nova outburst mechanism is essentially non destructive we should expect the nova to return to mag. 17 or thereabouts over the next year or two.

Quote:

With the earlier onset of nightfall it will be possible to
keep tabs on the nova as it moves further to east with each
passing day.



Sorry I don't get it. The nova's position is becoming increasingly unfavourable until it reaches conjunction with the Sun in late January ... should still be observable to those of us in temperate northern latitudes, though, as it is around 40 degrees North of the ecliptic.


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Rich (RLTYS)Moderator
Post Laureate
*****

Reged: 12/18/04

Loc: New York (Long Island)
Re: New nova in delphinus new [Re: brianb11213]
      #6146176 - 10/19/13 08:11 AM

Finally observed V339 Del last evening for the first time in weeks. Estimated mag 10.3 using comp stars 98 and 105.

Rich (RLTYS)


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nytecam
Postmaster


Reged: 08/20/05

Loc: London UK
Re: New nova in delphinus new [Re: canukLX90]
      #6147824 - 10/20/13 03:34 AM

Quote:

F2.8 with the 30cm! That must be some reducer (:
PJ


Yes - Meade f/3.3 FR cranked up to f/2.8 really sucks in the photons in my very brief exposures

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