[vsnet-alert 26138] Re: RS Ophiuchi eruption confirmed

Mon Aug 9 20:56:19 JST 2021

We performed some follow-up of RS OPHIUCHI 2021 outburst through a TEL
0.1-m f/3.6 astrograph + CCD located in the Heaven's Mirror
Observatory, Australia (MPC code Q56) and operated by Telescope Live
network.

On images taken on August 09.42, 2020 we can confirm the presence of
an optical counterpart (approximate R-filtered magnitude about +4.8;
images were saturated in 10-second exposures) at coordinates:

R.A. = 17 50 13.20, Decl.= -06 42 28.2

(equinox 2000.0; UCAC4 catalogue reference stars for the astrometry).

Our image is available here:

https://tinyurl.com/rsoph2021

With kind regards,

Ernesto Guido, Marco Rocchetto & Adriano Valvasori
https://telescope.live/

On Mon, Aug 9, 2021 at 1:40 PM Hiroyuki Maehara mira at cetus-net.org via
vsnet-alert <vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp> wrote:
>
> Visual magnitude estimates by VSOLJ members
>
> object         YYYYMMDD(UT)   mag  code
> OPHRS          20210809.455    44  Mhh.VSOLJ
> OPHRS          20210809.465    44  Mdy.VSOLJ
> OPHRS          20210809.469    45  Wny.VSOLJ
>
> Observers / Instruments:
>  Mdy: Yutaka Maeda (Nagasaki, Japan) / 3cmB
>  Mhh: Hiroyuki Maehara (Okayama, Japan) / 4.2cmB
>  Wny: Yasunori Watanabe (Kanagawa, Japan) / 5cmB
>
>
> On Mon, Aug 09, 2021 at 19:43:32, Hiroyuki Maehara wrote:
> > According to Kojima-san, RS Oph was in quiescence on Aug 8.487.
> >
> > object         YYYYMMDD(UT)   mag      code
> > OPHRS          20210808.487   117c     TKo
> >
> > Observer: Tadashi Kojima (Gunma, Japan)
> > Instruments: f.l.=300mm lens + Canon EOS 6D
> >
> >
> > On Mon, Aug 09, 2021 at 13:48:59, JBD wrote:
> > > I would like to propose this spectrum of RS-OPH done despite cloud cover
> > > of more than 25% and done with an alpy-600.
> > >
> > > Stacks of 9 images of 500 sec.
> > >
> > > Jean-Bruno Desrosiers (JBD)
> > > Observatoire du Mont St-Joseph.
> > > http://omsj.info | AAVSO: DJED
> > > Latitude : N45.26' | Longitude : O71 06'
> > >
> > > Le 2021-08-09 à 00:01, Kirill Sokolovsky a écrit :
> > > > YYYYMMDD(UT) mag
> > > > 20210809.12432  4.77V
> > > >
> > > > Preliminary photometry with the 0.6m telescope of Michigan State
> > > > University.
> > > > Assuming V= 9.34 for the comparison star HD 162215.
> > > >
> > > > Best wishes,
> > > > Kirill Sokolovsky
> > > >
> >
>
> --
> Hiroyuki Maehara
> mira at cetus-net.org
> http://www.cetus-net.org/
>