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Observing >> Variable Star Observing and Radio Astronomy

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Eteny
member


Reged: 06/20/12

Loc: Manila, Philippines
Re: New nova in delphinus new [Re: Joe F Gafford]
      #6029381 - 08/16/13 03:13 PM

Hello everyone,

Here is an image of Nova Delphini 2013 from the Philippines. Image taken on August 16, 2013 using a tripod-mounted Canon 450D DSLR with 50 mm lens set at f/1.8, 10 x 6 sec exp, ISO 1600.


http://nightskyinfocus.com/2013/08/17/nova-delphini-2013-a-newly-discovered-n...

Clear skies!

Eteny


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jmandell
sage


Reged: 06/15/11

Re: New nova in delphinus new [Re: Eteny]
      #6029395 - 08/16/13 03:19 PM

I was clouded out last night, but tonight looks good, so I'll be imaging tonight. Will be looking for it naked eye as well. Will it be naked eye

Edited by jmandell (08/16/13 03:35 PM)


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Dave Mitsky
Postmaster
*****

Reged: 04/08/02

Loc: PA, USA, Planet Earth
Re: New nova in delphinus new [Re: jmandell]
      #6029516 - 08/16/13 04:37 PM

A number of observers have reported seeing Nova Delphini 2013 without optical aid.

Dave Mitsky


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Aquarellia
professor emeritus


Reged: 10/27/12

Loc: Provence, France
Re: New nova in delphinus new [Re: Dave Mitsky]
      #6029573 - 08/16/13 05:10 PM Attachment (24 downloads)

Indeed, I can detect the nova with unaided eyes, quite difficult because of the moon light. Easy with binoculars.
My mag. estimation via the AAVSO map : 4.7 +/- 0.2
Here my sketch :

Edited by Aquarellia (08/16/13 05:15 PM)


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Nick Rose
super member


Reged: 11/01/10

Loc: San Mateo, CA
Re: New nova in delphinus new [Re: Aquarellia]
      #6029584 - 08/16/13 05:14 PM

Last night was a clear night so I dusted off the telescope and imaged Nova Delphini 2013. This was my first time using the colored filters so its not the best. L 30x60sec, RGB 5x30sec.


New Nova 3 by Nick R2006, on Flickr


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Octans
member


Reged: 08/13/09

Loc: Santa Barbara, CA, USA
Re: New nova in delphinus new [Re: Nick Rose]
      #6029589 - 08/16/13 05:17 PM

Looks like it may have reached / passed its peak based on the latest data points: http://www.aavso.org/lcg/plot?auid=000-BLC-933&starname=NOVA%20DEL%202013...

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BrooksObs
professor emeritus


Reged: 12/08/12

Re: New nova in delphinus new [Re: Octans]
      #6029637 - 08/16/13 05:52 PM

Quote:

Looks like it may have reached / passed its peak based on the latest data points: [url=http://www.aavso.org/lcg/plot?auid=000-BLC-933




Indeed, novae are like comets in a way. They tend to have minds of their own! I had no sooner posted about Nova Del's potential for breaking magnitude 4.0 tonight when observations from Europe began appearing that indicated a drop in the nova's brightness.

So, it looks like the peak brightness came while Nova Del was best placed for observation in the Far East. Now it becomes a matter of waiting to see what it might do next...particularly if it indeed turns out to be a "slow" nova.

BrooksObs

Edited by BrooksObs (08/16/13 06:19 PM)


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Nick Rose
super member


Reged: 11/01/10

Loc: San Mateo, CA
Re: New nova in delphinus new [Re: BrooksObs]
      #6029644 - 08/16/13 05:55 PM

Does anyone know what the distance to the Nova is?

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Octans
member


Reged: 08/13/09

Loc: Santa Barbara, CA, USA
Re: New nova in delphinus new [Re: Nick Rose]
      #6029707 - 08/16/13 06:27 PM

A quick search turned up this: http://en.wikipedia.org/wiki/Nova#Novae_as_distance_indicators It says that:

Quote:


For instance, the distribution of their absolute magnitude is bimodal, with a main peak at magnitude −8.8, and a lesser one at −7.5. Novae also have roughly the same absolute magnitude 15 days after their peak (−5.5).





If you have apparent magnitude (m) and absolute magnitude (M), the distance (d) in parsecs is d = 10^((m-M+5)/5)

From the AAVSO curve, it looks like the peak is at an apparent magnitude of 4.3. Assuming an absolute magnitude of -8.8 (which is just an assumption, since we don't know yet), the distance is:

d = 10^((4.3+8.8+5)/5) = about 4000 parsecs

The alternative peak brightness estimate (M = -7.5) turns up a distance of about 7000 parsecs.

The margin of error is pretty big, but the distance should be somewhere around there. If there's a significant amount of dust in front of it, the true distance will be closer.


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avdhoeven
sage


Reged: 05/27/10

Loc: netherlands
Re: New nova in delphinus new [Re: Nick Rose]
      #6029708 - 08/16/13 06:27 PM

Here is an animation before and after based on my own and Digitized sky survey data...

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thewheel
member


Reged: 07/01/09

Loc: Half Mile from Tucson
Little Dolphin Nova North of Tucson new [Re: avdhoeven]
      #6029745 - 08/16/13 07:00 PM

Saw this last night naked eye just north of Tucson at 4am (1100GMT 2013/8/16). In 8x40 binoculars it was about the same magnitude as 29 Vul (Mag ~ 4.8). It seemed brighter than it was at 10pm earlier. Moon had set by 4am.

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Bruce MacDonald
Pooh-Bah


Reged: 01/12/06

Loc: Devizes, Wiltshire, UK
Re: Little Dolphin Nova North of Tucson new [Re: thewheel]
      #6029798 - 08/16/13 07:39 PM

I estimated Nova Del 2013 at mag +4.9 this evening at 2100 UTC

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John Gauvreau
Astro Sensei


Reged: 10/19/07

Loc: Dundas, Ontario, Canada
Re: Little Dolphin Nova North of Tucson new [Re: Bruce MacDonald]
      #6030018 - 08/16/13 10:28 PM

Just had a look at 10:00pm EDT and I would estimate magnitude 4.9, just slightly dimmer than 29 Vul.

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tezster
scholastic sledgehammer
*****

Reged: 07/14/09

Loc: Missisauga, Canada
Re: Little Dolphin Nova North of Tucson new [Re: Bruce MacDonald]
      #6030019 - 08/16/13 10:29 PM

Observed it with 10x50 binoculars around 0200 UTC - the magnitude looked identical to 29 Vul.

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Gil V
professor emeritus


Reged: 09/09/12

Re: Little Dolphin Nova North of Tucson new [Re: tezster]
      #6030153 - 08/17/13 12:09 AM

Dimmer than last night. No longer naked eye in orange zone CT.

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John_G
sage


Reged: 01/18/10

Re: Little Dolphin Nova North of Tucson new [Re: Gil V]
      #6030197 - 08/17/13 12:39 AM

I was able to spot it tonight with the naked eye but just barely. When looking directly at it, it would appear and disappear the reappear. A little better when the moon moved behind some clouds.

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nytecam
Postmaster


Reged: 08/20/05

Loc: London UK
Re: Little Dolphin Nova from London! new [Re: John_G]
      #6030343 - 08/17/13 04:46 AM Attachment (20 downloads)

A rare peep in finder for for me but nova easily visible in scope's small finder ! My montage from last night of nova field plus lo-res spectrum via Rainbow grating including Altair's for reference of hydrogen Balmer lines - emission lines in nova's spectrum typical and should intensify with the week or so.

In fact my manual slew from Altair, I ID nova by its bright H-alpha line on downloaded spectrum so I knew I was on target - good fun


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Rich (RLTYS)Moderator
Postmaster
*****

Reged: 12/18/04

Loc: New York (Long Island)
Re: Little Dolphin Nova from London! new [Re: nytecam]
      #6030402 - 08/17/13 07:27 AM

Under hazy skies I observed N Del 2013 last night (8/16) with my 12x63's and using comp stars 44 and 48 I estimated the nova at mag 4.6. Yes the nova maxed out at about 4.2 and is now fadeing.

Rich (RLTYS)


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Hubert
sage


Reged: 09/26/06

Loc: Belgium
Re: Little Dolphin Nova from London! new [Re: Rich (RLTYS)]
      #6030436 - 08/17/13 08:15 AM

We must watch out for rebrightning! That's always possible

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SabiaJD
scholastic sledgehammer


Reged: 02/20/05

Loc: Clarks Summit, PA
Re: Little Dolphin Nova from London! new [Re: Hubert]
      #6030517 - 08/17/13 09:18 AM Attachment (29 downloads)

I viewed Nova Del 2013 last night August 16, 2013 EDT, August 17, 2013 UT under clearer sky condition, but with brighter moonlight, from a darker sky location.

Position my chair in the shade of a wall to block out the moonlight, as I viewed the nova with 10 x 50 binocular. Using AAVSO Chart 12508BUL the nova was at 4.6 magnitude. This is brighter than the previous night.

I had some difficultly seeing the nova with the naked eye, mainly due to the moonlit sky condition.

The photo is taken with a 77mm f/6.1 BORG scope with a SBIG ST-i camera. A stack of 29, 6 second exposures.
Eliminated one with a satellite between the nova and star SAO 88610.
Recalled seeing 4 satellites on the previous evening emerging from the shadow of the Earth moving north.


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