[vsnet-alert 25199] Re: ZTF19aadqrmz = ASASSN-20qp

[Graeme Coates]

I observed this object last night (20210106 2300UT - 20210107 0030UT)

This object showed variation of about 0.11 magnitudes over this period
(15.07CV - 15.18CV) with a shape like that of a superhump. Unfortunately,
transparency was not great, and I was fogged out at the end of the run so
cannot confirm any periodic nature.

Data will be uploaded to AAVSO/BAA VSS.

Graeme

On Mon, 4 Jan 2021 at 23:18, Kojiguchi <kojiguchi at kusastro.kyoto-u.ac.jp>
wrote:

> ZTF19aadqrmz = ASASSN-20qp
>
>      Large outburst amplitude of 6.6 mag. Probably superoutburst.
>
> ASASSN-20qp --- ------- 7:7:8.03 -0:56:40.9 2020-12-31.95 14.02 -------
> CV candidate, in TESS, matches to PS1 g=20.6, g>16.9 on 2020-12-29.19,
> g=14.1 on 2020-12-30.46, g=14.3 on 2020-12-31.95, g=14.4 on
> 2021-01-01.80, g=14.4 on 2021-01-02.06, g=14.8 on 2021-01-04.49.
>
> Lasair:
> https://lasair.roe.ac.uk/object/ZTF19aadqrmz/
>
> ASASSN Sky Patrol:
> https://asas-sn.osu.edu/light_curves/4e7503ad-458d-4c86-90e4-9cd2d4dc071f
>
> 2019: probably normal outburst
> ASASSN-20qp 20190119.3 <160g ASN
> ASASSN-20qp 20190120.3 15.050zr ZTF
> ASASSN-20qp 20190121.3 15.843zr ZTF
> ASASSN-20qp 20190122.1 17.052zr ZTF
> ASASSN-20qp 20190122.2 16.893zg ZTF
> ASASSN-20qp 20190123.1 <162g ASN
> ASASSN-20qp 20190124.2 19.626zg ZTF
> ASASSN-20qp 20190124.3 19.513zr ZTF
>
> 2020--2021: probably superoutburst
> ASASSN-20qp 20201229.2 <15.711g ASN
> ASASSN-20qp 20201230.5 14.027g ASN
> ASASSN-20qp 20201231.3 14.191g ASN
> ASASSN-20qp 20210101.3 14.258g ASN
> ASASSN-20qp 20210102.1 14.244g ASN
> ASASSN-20qp 20210104.5 14.662g ASN
>
> IDs:
> 070708.015 -005641.10 (2000.0) Gaia_DR2_3109614703798504320
> plx=1.082(1.251) dismod=9.8 pmra=-19.040(3.874) pmdec=5.304(2.820)
> G=20.550 BP=20.488 RP=20.543
> 070708.023  -005641.19 (2000.0) Gaia_EDR3_3109614703798504320
> plx=1.8549(0.9772) pmra=-13.953(1.226) pmdec=6.182(1.178) G=20.422
> BP=20.573 RP=20.391 BP-RP=0.183
> 070708.013  -005641.10 (2000.0) PS1_106861067834186758 g=20.6000(0.0244)
> r=20.5590(0.0426) i=20.6662(0.0342) z=20.4804(0.0449)
>
>