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Observing >> Variable Star Observing and Radio Astronomy

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RobK
sage


Reged: 07/06/08

Loc: Bright, Vic, Australia
Old nova V841 Oph, 10 June 2013
      #5912338 - 06/10/13 12:49 AM

A vsnet_alert has been put up on old nova V841 Oph, with an observer reporting brightening by nearly two magnitudes from its quiescent state. This nova was discovered in outburst in 1848 by J R Hind. Maximum brightness observed was 4.3.
http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-alert/15820
http://www.aavso.org/lcotw/v841-ophiuchi

Co-ords are: RA 16 59 30.37, Dec -12 53 27.2 (J2000)

Confirmation is urgently sought. Cloudy here...

Cheers -

Rob


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RobK
sage


Reged: 07/06/08

Loc: Bright, Vic, Australia
Re: Old nova V841 Oph, 10 June 2013 new [Re: RobK]
      #5912460 - 06/10/13 06:00 AM Attachment (17 downloads)

The sky cleared late I managed to image it. Appears to be around the mid mag 13s in the green channel of my RGB DSLR image, say mag 13.6. This is pretty much on the quiescent magnitude given in AAVSO's VSX catalogue. Might still be worth watching in case there actually was a 'flicker' that could be the precursor of an outburst. Or is that wishful thinking?!!

The following image has relevant AAVSO comparison stars marked. It's a 2x resize from a crop.

Cheers -

Rob


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Rich (RLTYS)Moderator
Postmaster
*****

Reged: 12/18/04

Loc: New York (Long Island)
Re: Old nova V841 Oph, 10 June 2013 new [Re: RobK]
      #5912611 - 06/10/13 09:00 AM

Based on your image I would agree with your mag estimate. Maybe I can image it.

Rich (RLTYS)


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

Loc: New York (Long Island)
Re: Old nova V841 Oph, 10 June 2013 new [Re: Rich (RLTYS)]
      #5914731 - 06/11/13 09:51 AM Attachment (13 downloads)

Took an image this morning (6/11) with the SLOOH T2hm scope which seems to confirm V841's magnitude of 13.6, in green light (Tri-G).

Rich (RLTYS)

Edited by RLTYS (06/11/13 09:53 AM)


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BrooksObs
professor emeritus


Reged: 12/08/12

Re: Old nova V841 Oph, 10 June 2013 new [Re: Rich (RLTYS)]
      #5915557 - 06/11/13 05:54 PM

Having observed this star off and on for the past 30 years I can affirm that a magnitude of around 13.6 is absolutely normal for it in its quiescent state. I can also say that the report it had recently brightened up seems to have been the result of the combining of some faint CCD estimates with a single unconfirm visual sighting that looks to be inaccurate.

BrooksObs


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

Loc: New York (Long Island)
Re: Old nova V841 Oph, 10 June 2013 new [Re: BrooksObs]
      #5916469 - 06/12/13 07:51 AM

BrooksObs, thanks for the info.

Rich (RLTYS)


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