New Dwarf Nova in Gemini

Forums Variable Stars New Dwarf Nova in Gemini

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  • #575126
    Gary Poyner
    Participant

    VSNET-alert 26492 issued on December 28 reports the discovery of a large outburst amplitude (7.7 magnitudes) transient in Gemini, discovered by “Tadashi Kojima, Tsumagoi,Gunma-ken, Japan, on three frames(5_s exp) under limiting mag.= 14.2 taken by Canon EOS 6D + 200mm f/3.2 lens. Nothing is visible at this location taken on 2021 Dec14.741 UT under limiting mag.= 14.0. Mag=13.5 on 2021 Dec28.610UT with same instrument.”

    Position 07 09 49.36 +14 12 28.0

    The object ‘may’ be a new UGWZ type Dwarf Nova.

    A SLOOH image taken on Dec 29.037 revealed a magnitude of 12.15CV.

    Please use the desigation TCP J07094936+1412280 when reporting to either the BAAVSS or AAVSO.   An AAVSO chart and sequence is available from the AAVSO VSP.

    Gary

    #585053
    David Swan
    Participant

    Conditions weren’t great – certainly not photometric quality – but I imaged the field and the image gives a ballpark indication of brightness (certainly consistent with Forth’s obs). Midpoint 2021-12-29T21:44. PA 297deg; 80′ x 60′.

    #585054
    Mark Phillips
    Participant

    Just for reference, I believe this is correct. My image:

    From Aladin

    #585052
    Mark Phillips
    Participant

    I believe it’s this one and AstroImageJ gives me a V mag of 12.3.

    Taken this evening 29-12-2021 21:55 UT

    3x180s subs stacked
    250mm f4.8 Newtonian
    QHY168C – green channel only

    Mark Phillips
    Edinburgh

    #585059
    David Swan
    Participant

    I estimated the brightness at about 12.595 CV, with a delta for the check* star (*corrected) of 0.021.

    #585055
    Denis Buczynski
    Participant

    Image of this object taken 20211230 0153 at Tarbatness. Image is south up and west left

    #585062
    Mark Phillips
    Participant

    Very poor conditions tonight with drifting cloud and only enough gaps for 30s exposure, but clearly fainter. 
    AstroImageJ gives 13.1 V now.

    At 2021-12-31 23:31UT

    #585102
    Gary Poyner
    Participant

    Eleven days into the outburst, this dwarf nova of the relatively rare type UGWZ is still fairly bright in the evening sky after fading by just over two magnitudes since discovery, and remains worthy of continued observation – visual, single image or time series.

    My own light curve consiting of visual observations from Birmingham and CCD images from COAST and SLOOH is shown below.

    Gary

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