[vsnet-alert 25439] Re: V618 Sgr brightening

[Patrick Schmeer pasc1312-aavso@yahoo.de via vsnet-alert]

 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