Affiliation
Nucleo de Estudo e Observacao Astronomica - Jose Brazilicio de Souza (Florianopolis, Brazil) (NEOA-JBS)
Sun, 08/08/2021 - 22:22
Dear friends,
RS Ophiuchi seems to be in outburst.
In August 8, 2021, at 21:55 UT I estimated it in magnitude 5.0.
An image was taken and it is at website:
http://www.geocities.ws/costeira1/img/20210808_2159ut.jpg
with regards,
AAX
Confirmed from Ireland !
Visual estimate 08 August 2021 2220UT 5.0
Keith.
…
Let me share my feelings:
After some photos in the Barnard's Star field and observing another variable stars, I think: "ok, it,s time to look to RS Oph before a high altitude", because my refractor is in a AZ3 mounting. By the finderscope it was possible to easily view a different pattern, a "new" star near Y Oph, and I thought "oops... wrong field?" But no, by the eyepiece there are all comps used for several months and RS Oph brighter.
In my astronomical yearbook for 2021, a page 162, I wrote: "according Bradley Schaeffer theoretic model, it's possible that RS Oph will experience a new eruption in 2021 or few years after it.
Alex!
Me too Alex, I was doing a regular nova patrol with my Canon 6D DSLR, when I checked the field I thought I centered it wrong !
I rechecked and could see RS Ophiuchi was indeed in outburst, I immediately grabbed my 20x100mm binoculars and could see this was so.
A wonderful find for us both !!
Keith.
I observed RS Oph with the naked eye and estimated: +4.6 mag. I took photos from my small homeland - from Yuzhno-Morskoy (near Nakhodka), Russia, on August 9, 2021, from 15:19 to 15:22 UT. I have been waiting for several hours for gaps in the clouds, and sky cleared only for a few minutes.
My photos: https://twitter.com/romanov_filipp/status/1424787419740741633 and https://www.flickr.com/photos/filipp-romanov/51367649821
With best regards, Filipp Romanov.
Congratulations to AAVSO observers Alexandre Amorim (AAX), Eddy Muyllaert (MUY), and Keith Geary (GKI) for catching the current outburst of RS Oph all independently and within an hour of each other!
To read more, see Alert Notice #752: https://www.aavso.org/aavso-alert-notice-752
There are threads for this object under the following forums:
- Time Sensitive Alerts: https://www.aavso.org/outburst-rs-ophiuchi
- Novae: https://www.aavso.org/rs-ophiuchi
- Cataclysmic Variables: https://www.aavso.org/outburst-rs-ophiuchi
- Spectroscopy: https://www.aavso.org/rs-oph-outburst-2021
Please subscribe to these threads if you are observing this nova so you can be updated as to its behavior and any observing campaigns on it. Join in the discussion or ask questions there!
Even better, get out and observe it!
Clear Skies,
Sara
Hi all, I have observed RS Ophiuchi again tonight at 2307 UT August 9th 2021 with my 20x100mm binoculars, I estimated it’s visual magnitude at 4.8.
It struck me that to me there is a change in colour - the star was initially blue in early outburst, I now saw a pale yellow colour.
Keith.
Similar view, Keith.
Today my sky is not too good, with some cirrus. But I noted RS Oph yellowish. First using 10x50 binoculars. Through 90mm f/10 refractor it was easy to detect its color, some different from yesterday when I observed a white star.
My estimate for today, August 9, is 5.0, by 10x50B.
I did another estimates, but I'll send to AID.
With regards
AAX
…
Comparing two outbursts:
Using WebObs data,
In 2006
last visual observation before outburst
2006-02-10 06:00 UT m = 10.9 MED
first visual observation of the outburst
2006-02-13 03:54 UT m = 4.8 RWG
difference +2,91 days (or c. 70 hours)
Now
last visual observation before outburst
2021-08-07 23:15 UT m = 11.2 AAX
first visual observation of the outburst
2021-08-08 20:52 UT m = 5.1 MJZ
difference +0.9 days or 21,6 hours
But in August 8, between 13:47 and 15:27 UT, Lou and Wang catched the star rising from 9.1 to 7.0 in V.
Amazing!
Alex, thanks for the information regarding the timiline in UT between your observation and what followed. Going by what is given here, you were very close to witness the very beginning of the outburst ! Assuming it took less than two hours to rise from magnitude 9.1 to 7.0, it must have started around 1200UT August 8th.
How did you find out about Lou & Wang's observations?
Amazing !
Keith.
http://nova…
the image URL：
http://nova.astrometry.net/image/11658797
http://nova.astrometry.net/image/11658847
http://nova.astrometry.net/image/11658900
Very cool in spectro!
http://omsj.info/Download/RS_OPH-NR+LB-2021-08-08_JBD-OMSJ-C.zip
JBD
Hi all
Like many, I've enjoyed observing RS Oph, submitting a few binocular visual observations to AID and writing a post or three:
Last week I was asked to give a brief talk by the president of our local club (https://www.assa.org.au) at the next meeting about RS Oph.
While researching RS Oph and recurrent novae in general, I came across this nice post on CVNet by Mike Simonsen in his usual enthusiastic style:
https://sites.google.com/site/aavsocvsection/articles/recurrentnovae
He was larger than life, that's for sure.
Anyway, I just wanted to share that.
David
"(...) on 2021 September 2, October 4 and October 7. We have not detected flickering on minute-to-hour time scale with amplitude greater than 0.05 mag.
At quiescence RS Oph exhibits variability on minute-to-hour time scale with amplitude 0.2-0.3 mag in B band. The flickering disappeared after the 2006 outburst and was first detected 240 days later (...)
it will be important to follow the UBV bands and to detect when and how the flickering will re-appear."
https://www.astronomerstelegram.org/?read=14974