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Posted by Gary Poyner at 10:10 on 2011 Aug 03
Australian observer Rod Stubbings has detected an outburst of SV Ari. So what I hear you say? SV Ari is/was Nova Ari 1905. Poorly observed at the time (no spectrum), it was classified as N? in Duerbeck’s catalogue. One further report of a sighting in 1943 was not confirmed, and nothing has been seen since (despite a few of us monitoring the field for decades). Now Rod has detected it at mag 15 on Aug 02.79 UT. Confirming observations are now coming in, which show (at this early stage) that SV Ari looks to be a rare’ish UGWZ type star (from time series observations). David Boyd has captured an image, which is on the front page of the VSS web page.SV Ari has likely had previous outbursts which have been missed due to it’s location on the ecliptic. 106 years is a long time interval between outbursts, even for a UGWZ star. Alternatively, I wonder if a spectrum might reveal it to be a Recurrent Nova?Yeah, Variables are boring :-)Gary
Posted by Paul A Brierley at 17:20 on 2011 Aug 03
Out of reach through my 25cm f4.8. But still very interesting.Out of interest. Do you know the length of David’s exposure?Good luck with any observation’s.
Posted by Gary Poyner at 18:02 on 2011 Aug 03
A stack of 5×60 second exposures with a V filter! He uses a 35cm SCT.We have no idea as to how bright it will get, or even if this is a fainter precursor to a major outburst. Only time wil tell.Cheers,Gary
Posted by Paul A Brierley at 06:52 on 2011 Aug 04
Do you have any finder chart’s showing the location of SV Ari?I might try to get an image using my SPX 200-800 "AG" But unfortunately. I don’t know where to look.
Posted by Roy Hughes at 09:13 on 2011 Aug 04
Paul,I just Googled "Nova Ari 1905" and its second hit was a paper with an (admittedly close in!) finder chart. Strangly no co-ordinates though.Roy
Posted by Gary Poyner at 10:14 on 2011 Aug 04
Paul,You can get a chart for it from http://www.aavso.org/vsp Just type in SV Ari at the top, then choose what type of chart orientation you want, field size etc.The original position measured from Heidelberg plates was thought to be in error. This outburst should give accurate astrometry, although it’s probably just seconds of arc in error (if any) looking at outburst images I have.Gary
Posted by Gary Poyner at 17:01 on 2011 Aug 04
I’ve put a time series plot by Nick James on the front of the VSS web page, if anyone is interested in how these CV’s fluctuate over short time periods. Click the small image to bring up a larger one. Very latest data from US observers show SV Ari now faded to below mag 17.0V. Is this a precursor outburst after all, or the biggest disappointment since my Mum wouldn’t let me go to the Isle of Wight in 1970 to see Jimi Hendrix?Gary
Posted by Peter Meadows at 20:41 on 2011 Aug 04
An image of SV Ari taken by Guy Hurst on Aug 3.483 UT using the Sierra Stars robotic telescope can be seen at http://www.britastro.org/robotscope/hurst04.htm when the nova was at mag. V = 15.44.
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