IX Dra: observations requested

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  • #583365
    Jeremy Shears
    Participant

    Yes, with ER UMa stars having very frequent outbursts, there’s always something to see, Stewart. Great fun!

    #583381
    Gary Poyner
    Participant

    IX Dra is now fading from Stewarts superoutburst.   Last couple of nights…

    Nov 14.82   15.3 visual

    Nov 16.88   15.49CV

    I’ll keep going with this one I think.

    Gary

    #583382
    Stewart John Bean
    Participant

    SRO telescope , Arizona gave 15.3 at  1:33:8.35 UT on November 16, 2020.

    Those recorded by TESS were about 10 days in duration from when the first superhumps appeared to getting back to quiescence at mag 17.

    Stewart

    #583424
    Stewart John Bean
    Participant

    The November superoutburst is over,  a return to quiescence at mag 17 and then a rise to 15.9 has been reported by AAVSO observers.

    #583618
    Stewart John Bean
    Participant

    The next superoutburst is expected in the first half of January.

    IX Dra is now quite a difficult object for the USA based AAVSOnet telescopes that I have been able to use so far, although a couple of AAVSO observers ( Sweden and Virginia, USA) do seem to have reasonable northerly aspects and continue to report. AAVSOnet SRO Arizona is out of service at this time with a failed camera.

    UK observers benefit from their higher latitude compared to the USA, but IX Dra  has a very low elevation at this time of year.

    If anyone can help for the period from Jan 1st to Jan 15th to capture the start of the superoutburst it would be appreciated. The most likely date for the start is in the middle of the window above – with the usual uncertainties.

    Stewart 

    #583625
    Jeremy Shears
    Participant

    A quick reminder that we are only a few days away from the next superoutburst of IX Dra (perhaps 3 to 7 days). Hence observations are encouraged.

    I had it at mag 17.1 last night (NY Eve) – just declined from the last “normal” outburst”. The next outburst could well be the super…keep watching!

    #583636
    Jeremy Shears
    Participant

    Thanks Graeme. That is helpful. Try on other evenings if you can.

    #583635
    Graeme Coates
    Participant

    I have this somewhere around Mag 17.5-17.9 (CV) at 18:45UT this evening (2nd Jan 2021) – not a very accurate measurement as running from Spain with a small widefield refractor, and it’s already getting low at dusk – 8 oktas at home…  

    (This a single 10min exposure (ED80 + STF8300M)

    #583641
    Graeme Coates
    Participant

    2021-01-03 1851UT – Better conditions than yesterday (better transparency).

    Mag 17.0 (CV)

    #583659
    Stewart John Bean
    Participant

    I am on a couple telescopes in New Mexico in  few hours time. Had no luck with itel Spain owing to “roof closed”: clouded out.

    Stewart

    #583660
    Robin Leadbeater
    Participant

    Have just been looking at where this field is so I can take a quick look with the spectrograph guider from time to time. Impressed by how bright (and blue) it appears in the DSS image

    #583661
    Stewart John Bean
    Participant

    Sorry Robin : DSS? I’m too new to this topic

    I did get an image at 5:30am local from New Mexico and estimate V mag 17.1 +_0.33.

    So we seem to observed a normal outburst at mag 16 on the 5th at 2459220.29 recorded by Graeme Coates.

    Stewart

    #583662
    Robin Leadbeater
    Participant

    Sorry this is a historical observation from the Digitized Sky Survey plates

    https://archive.eso.org/dss/dss

    #583663
    Jeremy Shears
    Participant

    I’ve just imaged IX Dra from my home obsy: mag 17.4C at 17.24 UT

    #583665
    Stewart John Bean
    Participant

    T05 New Mexico gave 17.27 this morning at 2459222.01.

    So still in a low state. Graeme Coates measured it at 16.0 on the 5th which may have been the peak of the last normal outburst. So that may mean another 3 days wait.

    #583667
    Stewart John Bean
    Participant

    Robin , How bright does a star need to be to obtain a decent S/N ratio spectrum?

    IX Dra is a bit faint perhaps, but ER Uma is brighter (V mag 13 maximum and better placed for observations ) and also approaching a superoutburst. See Discussion Forum on ER Uma and RZ Lmi.

    Stewart

    #583668
    Graeme Coates
    Participant

    I think there were some observations at 15.5 on the evening of the 4th (in the BAA dB) so probably just after peak for my one.

    #583669
    Stewart John Bean
    Participant

    Looking at the last superoutburst graph ( up this forum on Jan 12th ), I see that there was quite a gap between the last normal and  the normal outburst that led to the superoutburst. Immediately after a superoutburst the normals come every 3 – 4 days. Later they seem to be separated by 5-6 days. In the graph on the 12th Jan, it seems that there was a 7 day separation between the last two normals.

    On this basis the next normal might be on the 12th. This one might trigger the superoutburst. If so it will be 5 days late relative to the recent long term average.

    #583673
    Jeremy Shears
    Participant

    Jan 9.771  Mag 15.7 C

    looks like a new outburst 

    #583675
    Nick James
    Participant

    Just checked my images taken earlier this evening in thick fog. I get 15.4 (unfiltered vs Gaia DR2 G) at Jan 9.73 so it does look like an outburst. Image quality was rubbish though due to the fog. The last decent image I have of the field was Jan 6.73 when it was 17.08.

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