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Observing >> Variable Star Observing and Radio Astronomy

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Dean Norris
Carpal Tunnel
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Reged: 11/05/08

Loc: Santa Cruz, Ca
Re: New nova in delphinus new [Re: SabiaJD]
      #6045409 - 08/25/13 03:30 PM

Here's my last 3 estimations of the nova's magnitude:

5.8 on 5 UT 8/23/13
6.1 on 5 UT 8/24/13
6.2 on 5:45 UT 8/25/13

Dean


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canukLX90
professor emeritus


Reged: 12/25/08

Loc: B.C. Canada
Re: New nova in delphinus new [Re: Dean Norris]
      #6046363 - 08/26/13 03:21 AM Attachment (34 downloads)

Finally a clear night sky to view this wonder. Easily
visible in the 8X50 finder. If it wasn't for the clouds
I probably would have seen my first naked eye nova when it
was at its peak.

10 X 30 seconds at ISO 800 / F 2.8 PowerNewt / no processing
taken on the night of the 24th

PJ


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Rich (RLTYS)Moderator
Postmaster
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Reged: 12/18/04

Loc: New York (Long Island)
Re: New nova in delphinus new [Re: canukLX90]
      #6046452 - 08/26/13 06:29 AM

Observed N Del 2013 last night (8/25) using comp stars 57 and 61 I estimated the magnitude at 6.0. N Del's rate of fadeing seems to have slowed down.

Rich (RLTYS)


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SabiaJD
scholastic sledgehammer


Reged: 02/20/05

Loc: Clarks Summit, PA
Re: New nova in delphinus new [Re: BrooksObs]
      #6047047 - 08/26/13 01:57 PM

Quote:

It is becoming ever clearer that Nova Del's rise must have been very steep for a "slow" nova. The latest data provided through the AAVSO indicates that the nova was still fainter than at least magnitude 11.0 on Aug. 13.96UT, just a day and a half prior to the nova's discovery.

Considering that the rise occurred almost immediately following the scheduled peak of the Perseid meteor shower, one thing surprises me. Given that countless amateurs must have been out documenting the meteor shower with cameras of all sorts for several nights either side of the peak, it is a bit perplexing that as yet no positive observations of the rising nova have so far been reported. Will such yet come to light, I wonder?

BrooksObs




That is a good question. A 35mm SLR (film) with 50mm lens on a tracking platform will record stars to 10 magnitude. I have used such a setup to record the variable star U Sagitta on film. Modern DSLR camera with 50mm to 85mm does this with ease on a tracking platform. At the present time I do not own a DSLR camera, just a "point and shoot" with zoom features.

So why have no pre discovery images come to light? Poor record keeping practice comes to mind. Only the images that contain a meteor were kept, the rest were deleted. If all of the images made it from the camera storage device to a computer or storage then there is s better chance that one or more may have the area of the nova.
To identify the region of the sky the images were taken would be difficult task to any one who is not familiar with the constellations. More difficult if a written or verbal record was not taken during the sessions. Novice would have a hard time knowing what area of the sky the images show.

I have assisted many people with DSLRs on tripod image the sky, very few could identify the bright stars of Cassiopeia in their photos.

Looking at the meteor images posted on www.spaceweather.com for any pre discovery of Nova DEL 2013 finds very few with Delphinius in the image.

These are worth a look. I question the dates on some of these; local, UT or uploaded date? EXIF file with no information usually indicates a processed image.

http://spaceweather.com/gallery/indiv_upload.php?upload_id=85358 Nova not visible

http://spaceweather.com/gallery/indiv_upload.php?upload_id=85318 ?

http://spaceweather.com/gallery/indiv_upload.php?upload_id=85487 ?


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BrooksObs
professor emeritus


Reged: 12/08/12

Re: New nova in delphinus new [Re: SabiaJD]
      #6049513 - 08/27/13 07:35 PM

Hey, John, how ya doing? I think I've pinned down the explanation for a lack of positive imagining of the nova prior to its discovery.

It looks to me increasingly likely that most of the nova's rise between perhaps magnitude 12, or fainter, and its 6.8 discovery brightness must have taken place during just the hours when it was evening over the mid Pacific Basin on August 14th UT (the discovery coming on August 14.58UT). This is certainly what the improving negative observations are implying now.

Such timing would severely limit the number of potential ground station observers who might have been imaging the sky at the critical time. We do know with certainty now that the nova was still fainter than, and not detected, at magnitude 11.0 on August 13.96UT and fainter than 8.0 on August 14.21UT. Thus, the rise must have been very steep, perhaps surprisingly so for a rather "slow" nova, occurring at the least favorable longitude on the Earth for it being discovered during its rise.

BrooksObs

Edited by BrooksObs (08/27/13 07:38 PM)


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Dave Mitsky
Postmaster
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Reged: 04/08/02

Loc: PA, USA, Planet Earth
Re: New nova in delphinus new [Re: Dean Norris]
      #6049514 - 08/27/13 07:36 PM

Quote:

Here's my last 3 estimations of the nova's magnitude:

5.8 on 5 UT 8/23/13
6.1 on 5 UT 8/24/13
6.2 on 5:45 UT 8/25/13

Dean




I observed Nova Del 2013 with Celestron Ultima 10x50s at 23:30 p.m. EDT (3:30 UT) on Saturday night and put its brightness at approximately magnitude 6.2.

Dave Mitsky


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EJN
Carpal Tunnel
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Reged: 11/01/05

Loc: 53 miles west of Venus
Re: New nova in delphinus new [Re: Dave Mitsky]
      #6050009 - 08/28/13 02:23 AM

Quote:

Quote:

Here's my last 3 estimations of the nova's magnitude:

5.8 on 5 UT 8/23/13
6.1 on 5 UT 8/24/13
6.2 on 5:45 UT 8/25/13

Dean




I observed Nova Del 2013 with Celestron Ultima 10x50s at 23:30 p.m. EDT (3:30 UT) on Saturday night and put its brightness at approximately magnitude 6.2.

Dave Mitsky




Sunday night (8/25/13) at 11:30 pm CDT I estimated it at mag 6.2, there are 2 nearby stars on
the AAVSO chart marked 61 & 62, it was definitely dimmer than the mag. 6.1 star, and looked
the same as the 6.2 star.

Last night there were too many high clouds, and haze.

Just a few minutes ago, at 01:00 am CDT 08/28/13, in binoculars, it looked closer
to the mag 6.1 star, so it has leveled off again, and might be brightening
slightly.

I checked the latest AAVSO light curve plot, and it seems to bear this out.

http://www.aavso.org/lcg/plot?auid=000-BLC-933&starname=NOVA%20DEL%202013...


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John_G
sage


Reged: 01/18/10

Re: New nova in delphinus new [Re: EJN]
      #6052006 - 08/29/13 07:06 AM

On 8/29/13 at 2:30 UT my estimate was 6.5 with comp stars 64 and 69. I used my 10x50s.

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SteelStar
super member


Reged: 11/08/09

Loc: Oklahoma
Re: New nova in delphinus new [Re: John_G]
      #6052091 - 08/29/13 08:34 AM

My estimate was also 6.5 using my trusty ST120 refractor at 30x on the evening of the 28th.

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Rich (RLTYS)Moderator
Postmaster
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Reged: 12/18/04

Loc: New York (Long Island)
Re: New nova in delphinus new [Re: SteelStar]
      #6053880 - 08/30/13 06:37 AM

Despite clouds and haze I was able to observe N Del 2013 last evening (8/29), using comp stars 62 and 64 I estimated the nova's mag at 6.4.

Rich (RLTYS)


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Hubert
sage


Reged: 09/26/06

Loc: Belgium
Re: New nova in delphinus new [Re: Rich (RLTYS)]
      #6054305 - 08/30/13 12:06 PM

I estimated it yesterday (8/29) 6.6.

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John_G
sage


Reged: 01/18/10

Re: New nova in delphinus new [Re: Hubert]
      #6054377 - 08/30/13 12:46 PM

My estimate last night with 10x50s was 6.6 as well.

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Dean Norris
Carpal Tunnel
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Reged: 11/05/08

Loc: Santa Cruz, Ca
Re: New nova in delphinus new [Re: John_G]
      #6054474 - 08/30/13 01:38 PM

Last night I too estimated the brightness of the nova as 6.6 at 5:10 UT 8/30/13.

Dean


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NJScope
sage
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Reged: 03/08/04

Loc: NJ
Re: New nova in delphinus new [Re: Hubert]
      #6055034 - 08/30/13 08:11 PM Attachment (24 downloads)

I've been monitoring Nova Del 2013 with an SBIG DSS-7/ST-402ME spectrometer for the past week. Unfortunately I missed the earliest stages of the eruption during which P-Cygni like signals could be observed. Nonetheless, the changes between 21Aug and 28Aug2013 have been quite remarkable. One of the more notable differences is the increase in the Halpha emission peak (6562.82 Angstroms) relative to the other Balmer (Hbeta @4861.33, Hgamma @4340.47 and Hdelta @4101.74) emission lines.

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Rich (RLTYS)Moderator
Postmaster
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Reged: 12/18/04

Loc: New York (Long Island)
Re: New nova in delphinus new [Re: Hubert]
      #6057220 - 09/01/13 08:01 AM

Observed N Del 2013 last evening (8/31), under hazy skies. Using comp stars 69 and 71 I estimated its mag at 7.0.

Rich (RLTYS)


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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: Rich (RLTYS)]
      #6061925 - 09/03/13 11:35 PM

I observed Nova Del at 0230 9/04/13 UT with my 12x36 IS II binoculars. Estimated magnitude was 7.2 using nearby comp star 7.1--it's dimmed another whole magnitude since my previous observation 10 days ago.

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Rich (RLTYS)Moderator
Postmaster
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Reged: 12/18/04

Loc: New York (Long Island)
Re: New nova in delphinus new [Re: Special Ed]
      #6062166 - 09/04/13 06:08 AM

I observed N Del last evening (9/3) with my 12x63's. Using comp stars 71 and 73 I estimated the nova's mag at 7.1.

Rich (RLTYS)


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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<>animation new [Re: Rich (RLTYS)]
      #6063146 - 09/04/13 06:00 PM Attachment (24 downloads)

Here's an animation of 3 sketches I did over a 20 day period.

Edited by Special Ed (09/06/13 06:23 AM)


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Aquarellia
professor emeritus


Reged: 10/27/12

Loc: Provence, France
Re: New nova in delphinus<>animation new [Re: Special Ed]
      #6063629 - 09/05/13 12:19 AM

Well done Michael, very realistic.

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Rich (RLTYS)Moderator
Postmaster
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Reged: 12/18/04

Loc: New York (Long Island)
Re: New nova in delphinus<>animation new [Re: Special Ed]
      #6063866 - 09/05/13 07:26 AM

Looks good.

Rich (RLTYS)


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