30 May 2020 at 2:10 pm #582541
There is now a short and pretty basic PQ And page residing on the BAAVSS website https://britastro.org/vss/PQAnd.htm
Hopefully I’ll add to it as the outburst progresses, so if you have anything you’d like to share (spectrum, time series photometry etc. I’m not asking for much am I) then please send it to me and I’ll add it.
And please don’t forget to add your observations of PQ And to the BAAVSS database.
Gary30 May 2020 at 2:26 pm #582542
Good to see people overcoming the odds and securing successful observations of PQ And. I managed to see it this morning at about 02.25 BST. I decamped with my 12 cm refractor to a field a mile away and it’s far too low from my obsy as you can see from the angle of my telescope in the dawn sky.30 May 2020 at 6:40 pm #582543Paul LeylandParticipant
“this morning at about 14.25 BST.”
I hope you mean 04:25 BST, or dawn comes remarkably late where you live 😉31 May 2020 at 11:37 am #582546Rob JanuszewskiParticipant
Obtained this rather ‘noisy’ image in the predawn sky, using a 102mm refractor mounted on top of my 10″ SCT.
Rob Januszewski31 May 2020 at 11:55 am #582547
Good to see you’ve finally got to it after all these years! Quite something isn’t it!
Gary31 May 2020 at 12:04 pm #582548
Further to my #2 post above, our VSS director suggested I post a photo of my scope in PQ And mode. Well here it is. My trusty 30 year old battered 22cm dobby doing a balancing act on a table, but it does get me to view over the hedge. I often do this for stars low in the north which my 51cm in the observatory can’t get at. In the past it’s been on milk crates, house bricks etc. and even poked out of the bedroom window – much to my wifes’ disgust on a cold winters morning 🙂
The cat didn’t show up this morning, so this is one I made earlier…
Gary31 May 2020 at 12:20 pm #582549Rob JanuszewskiParticipant
Yes, great to catch a rare event like this. After 18 clear nights during May most of which have been exceptionally good quality I’m absolutely exhausted but just had to give it that extra half an hour to observe this.
Rob31 May 2020 at 1:55 pm #582550Nick JamesParticipant
That doesn’t look very stable Mr. Poyner. The cat looks to be a Brummie relative of bagpuss.31 May 2020 at 2:05 pm #582551
No it isn’t very stable Nick, but with careful handling it works fine – you just have to be patient! Without it I wouldn’t have seen PQ And at all!
And if these pesky NLC’s keep away from Brum, I’m hopeful of continued use for a while longer yet!
Bagpuss is a Brummie. Thought everyone knew that.1 June 2020 at 4:10 pm #582563Robin LeadbeaterParticipant
OK here are the spectra for 2020-05-29 and 30.
Apart from the hot continuum there is nothing common between them so unfortunately the details are probably just noise. They were taken at 5 deg altitude (air mass 10) in a bright sky though so to be honest it was a surprise to get anything1 June 2020 at 7:05 pm #582564
My goodness, Robin! You have certainly given this your best efforts. As you say, remarkable that you got anything given the circumstances!2 June 2020 at 4:10 pm #582568Tim HaymesParticipant
PQ was at alt 8deg, and managed a sequence of FITS from 1.30 to 3 am BST. BUT I dont know what to do with the data. However i have a memamsured image giving a R mag of 10.5 using UCAC4. I dont know how one gets V mag with a filter. Where do you get the ensemble photometry data for V (or G)? My image is attached (single image in Astrometrica).. I hope
The browser is not playing ball.2 June 2020 at 4:33 pm #582569Tim HaymesParticipant
Here goes. Ah! it seem to take a long time before its available to insert. I may have made a second comment…sorry2 June 2020 at 6:51 pm #582570Graeme CoatesParticipant
Someone (ahem…) years ago decided to build the observatory due south of my wife’s office – not sure she’d be happy with a demolition job to have half a chance of an observation of this one! (I think even then, there’s a large ash tree that might get in the way!)3 June 2020 at 9:21 am #582572
Nice work, Tim! Looks like you solved your problem, but just to say I use V-band comparison star data from the AAVSO VSP. Comps for PQ And are listed here. If you used a V-filter on your camera (which I assume is monochrome?), the resulting mags are quoted as CCD-V. If unfiltered they would be CCD-CV.
Thanks for tackling this star!3 June 2020 at 9:24 am #582573
I have poor horizons from my obsy, Graeme. But I’m lucky enough to have a second, portable, set up with an AZEQ6 mount which enables me to decamp to more favourable observing locations for special events like this.3 June 2020 at 2:28 pm #582578
An Astronomer’s Telegram, ATel #13776, from the Kyoto group publishes a spectrum taken on June 2. This “showed Balmer absorption lines with emission cores, which are typically seen in dwarf nova outbursts. There are no signals of O III, which were reported in the 1988 outburst”, although they question the 1988 conclusion.3 June 2020 at 5:16 pm #582581Robin LeadbeaterParticipant
With the help of Thomas Bayes perhaps I can now claim to have previously detected both the Balmer H beta absorption with emission core and H alpha emission 😉
My rectified spectrum from 2020-05-30 (red) overlaid on the spectrum published in the Atel
(I also see the problem of not being able to insert images. I had to press “preview” before I got the “insert” option)
Robin4 June 2020 at 10:20 am #582592David SwanParticipant
This implicit reference to posterior probability in Bayesian statistics is just the sort of intellectual high-brow stuff one would expect on our forum 🙂26 June 2020 at 3:53 pm #582689
PQ And is undergoing it’s first rebrightening today after fading to 16.6CV on June 25. Latest observations reveal 13.45V on June 26.45 (M. Mobberley). This could be the first of several rebrightenings (or the only one), so please stick with it for the next few weeks if possible.
The field is getting slightly easier in the morning sky now, so any observations made please report them to the VSS.
Thanks and good luck,
- You must be logged in to reply to this topic.