IX Dra: observations requested

Forums Variable Stars IX Dra: observations requested

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    Stewart John Bean

    The TESS satellite captured the most recent superoutburst completely. I estimate a start date of JD 2459633.

    The most recent estimated super outburst start dates are complied below. Sources are BAA database, AAVSO DB and TESS results.

    9162.5 56.5
    9224.2 61.7
    9283 58.8
    9344 61
    9403 59
    9463 60
    9519 56
    9577 58
    9633 56 TESS image below

    These give an average of 58.5 days.
    Thanks to all contributing to these measurements

    Stewart John Bean

    An update on IX Dra recent behaviour. Observations are been made by the AAVSOnet telescope in New Mexico, by BAA-VSS, and by AAVSO members.

    The most recent superoutburst was well recorded by AAVSOnet telescopes with a start around JD 2459688.

    TESS contributed a detailed record of the superoutburst at JD 2459633.

    The previous superoutburst was well recorded at JD 2459577.

    The next previous superoutburst was well recorded on JD 2459520.

    Graphing the most recent data gives the data in the attachment. This shows a declining trend from a peak around 60 days. The data point at JD 2459106 is almost certainly too high owing to limited observations. Observations were available only once the outburst had started so the start must be uncertain by a few days.

    It seems that for IX Dra the trend towards longer superoutburst periods has paused. It may be reversing.

    Thanks to all who have, and continue to, contribute to following this star.

    Stewart John Bean

    IX Dra is now in outburst (probably superoutburst) based upon two nights observations by AAVSOnet New Mexico and three by R Sargent.

    The previous superoutburst started 57-58 days ago. Hopefully more data from other observers, TESS and Lasair will refine the start date. This value (57-58 d) is unremarkable compared to the previous 10 superoutburst periods and suggests some stability.

    Thanks to those making observations.


    Stewart John Bean

    The most recent two superoutbursts (JD24598001 and JD2459853) were observed by the TESS satellite giving a very short supercycle period of only 53 days. Analysis of the last 800 days of AAVSO light curve suggests a gradual shortening of the cycle period. I’ll try to write this up in time for the next VSSC.

    If the current super outburst cycle is 52 days, we can expect the next superoutburst to start on JD2459905 or about November 20. Again thanks to the, at least, nine BAA members who are following this star.


    Jeremy Shears

    Thanks for the update Stewart. It was below mag 18 last night. I’m looking forward to the next superoutburst.

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