[vsnet-alert 25442] Re: V618 Sgr brightening

[Berto Monard astroberto13m@gmail.com via vsnet-alert]

Patrick, based on the recent deep eclipses, the orbital period is around
704d, not halve that...

Berto Monard / KKO

On Tue, Feb 23, 2021 at 11:10 AM Patrick Schmeer pasc1312-aavso at yahoo.de
via vsnet-alert <vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp> wrote:

>  V618 Sagittarii = HV 7203 (ZAND)
> https://www.aavso.org/vsx/index.php?view=detail.top&oid=28318
>
> The two deep fading episodes look like eclipses.
> The orbital period seems to be ~700 days (or ~350.6 days?):
>
> https://asas-sn.osu.edu/sky-patrol/coordinate/6ec1faad-65fb-4dd2-b766-659e0eca1561
>
> In 1940AnHar..90..207S "three sharp minima" at JD 2425800,
> 2426500, and 2427200 (interval 700 days) are mentioned.
> A previous minimum occurred around JD 2414200.
> All those minima could be fitted by a period of ~350.6 days.
>
> Regards,
> Patrick
> -------     Am Montag, 22. Februar 2021, 23:59:29 MEZ hat Hiroyuki Maehara
> <hiroyuki.maehara at nao.ac.jp> Folgendes geschrieben:
>
>  Kojima-san has reported a brightening of V618 Sgr.
>
> object        YYYYMMDD(UT)    mag      code
> SGRV618        20210219.828    102c    TKo
> SGRV618        20210220.830    102c    TKo
>
> Observer: Tadashi Kojima (Gunma, Japan)
> Instruments: f.l.=200mm lens + Canon EOS 6D
>
> ASAS-SN light curve (Shappee et al. 2014 and Kochanek et al. 2017):
>
> https://asas-sn.osu.edu/sky-patrol/coordinate/fc51007a-31c0-4c38-905b-9b17b250d325
>
>
>