Mon, 06/06/2022 - 19:09
The recurrent nova U Sco has been reported to be in outburst (M.Moriyama (Nagasaki, Japan): 2022 Jun. 06.56582 UT, <17.3 unfiltered; Jun 06.56582 UT, 11.4 unfiltered). This report has not been confirmed by other observers. However, because the outbursts of U Sco are so very short, there is no time to be lost, thus this post now, before confirmation. Please confirm, and if confirmed carry out multicolor photometry; visual observations are also welcome. Charts and comparison stars are available from the AAVSO Variable Star Plotter (VSP). Report your observations to the AAVSO International Database as soon as possible.
Many thanks and good observing,
Elizabeth O. Waagen, AAVSO HQ
U Scorpii (NR+E)
Recent ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) light curve and data:
SCOU 20220605.8889 <17.41g ASN
No minor planet brighter than mag. 15 was within a radius of 1° on 2022 June 6.72 UT.
Eruptions [sic] of this recurrent nova occur every 10 +/-2 years. The previous one was detected on 2010 January 28.
Spectroscopy and time-resolved photometry are also encouraged.
The recurrent nova "U Sco" has been just observed by Al Khatim Observatory (M44) in UAE, its magnitude is 8.67 (Green filter). The photo can be seen at: https://twitter.com/AstronomyCenter/status/1533907359797583876?s=20&t=tQhphdtS9dnU2JLRNHM5xg
Visual magnitude estimates by VSOLJ members
object YYYYMMDD(UT) mag code
SCOU 20220606.773 92 Mhh.VSOLJ
Observer: Hiroyuki Maehara (Okayama, Japan)
The recurrent nova "U Sco" has been just observed by Al Khatim Observatory (M44) in UAE, its magnitude is 8.67 (Green filter).
The photo can be seen at: https://twitter.com/AstronomyCenter/status/1533907359797583876?s=20&t=tQhphdtS9dnU2JLRNHM5xg
I can confirm the outburst.
My visual estimation is 8.0 at 22.11 UT.
Compstars are 74 and 83.
There have been false alarms for U Sco eruptions, so the many researchers in the SWIFT Nova group (dedicated to nova watching with Swift and other telescopes) did not know what to make of the true discovery report from Japan. It would be costly to kick off high priority ToO over-rides on various satellites -- if this were a false alarm. And just as the discussion was getting indeterminant, your confirmation kicked it over to everyone knowing that this was all a *GO*. With your confirmation, a lot of people started getting quick responses from various satellites. So, thank you for your speedy confirmation
Just wondering whether the Evryscope folks were able to catch this event as it rose from their detection limits. Supposedly they're covering the sky nightly in Sloan g and/or r at 2-minute cadence from Chile and Mount Laguna (outside San Diego, California).
The 2022 outburst of U Sco has been confirmed by several observers!
Please be sure to submit your observations to the AAVSO International Database (AID) as soon after you make them as possible - do not just post them in the forum. Putting them into the AID will make them available to astronomers worldwide in a timely manner.
Many thanks, and good observing,
Just submitted 3 observations made between June 06.9403UT and June 07.0243UT: slow rising between 8.1 and 8.0v.
Probably peaked around 8.0v tonight?
Yes it seems to have peaked already, I also submitted 3 observations, my last one at 2022 Jun. 07.03542 at visual magnitude 7.8
I see latest observations are at visual 8.4 or so
At Burleith Observatory, Washington DC, R. Schmidt (SREB) obtained 209 Cousins Ic images over a period of 1.92 hours on 7 June 2022 (2459737.56596 - 2459737.63211). During this interval the Ic magnitude brightened from 7.32 to 7.08.
In Ic band a linear fit was derived: m(Ic) = 7.27 - 2.27*(t - 2459737.566). Cloudy weather prevented further observations. Uploaded to AID.
My multicolor photometric observations of U Sco:
Remotely using 0.61-m f/6.5 corrected Dall-Kirkham telescope of Burke-Gaffney Observatory (Canada):
2022 Jun. 07.09358 7.794 V +/- 0.009
2022 Jun. 07.09770 8.038 B +/- 0.020
2022 Jun. 07.10087 7.447 Rc +/- 0.017
2022 Jun. 07.10199 7.173 Ic +/- 0.022
Remotely using 0.355-m f/6.2 Schmidt-Cassegrain telescope of Abbey Ridge Observatory (Canada):
2022 Jun. 07.20586 7.890 V +/- 0.048
2022 Jun. 07.20959 8.273 B +/- 0.021
2022 Jun. 07.21496 7.449 Rc +/- 0.016
2022 Jun. 07.21514 7.094 Ic +/- 0.032
With best regards, Filipp Romanov (Russia).
AAVSO Alert Notice 779 reports on the eruption of U Sco and announces an observing request from Prof. Brad Schaefer. Please see the notice for details and observing instructions.
There are threads for this eruption of U Sco under the following forums:
- Time Sensitive Alerts: https://www.aavso.org/u-sco-june-2022
- Cataclysmic Variables: https://www.aavso.org/u-sco-june-2022-01
Please subscribe to these threads if you are participating in the campaign so you can be updated. Join in the discussion or ask questions there!
Many thanks, and Good observing,
Elizabeth O. Waagen, AAVSO HQ
Observer: Filipp Romanov (RFDA).
DSLR observation (location: Yuzhno-Morskoy, near Nakhodka, Russia): Canon EOS 60D, 72mm, stacked 5x10 sec.:
2022 Jun. 07.56458 8.5 TG +/- 0.2
Brad Schaefer has posted a preprint (submitted to MNRAS) on astro-ph this evening. It contains many details of the activity from the last decade.
The Recurrent Nova U Scorpii from the 2010.1 to 2022.4 Eruptions; the Missed Eruption of 2016.78 +- 0.10 and the Critical Complex Period Changes