The recurrent nova V3890 Sagittarii seems to be erupting!
Confirmation, spectroscopy, and multiband photometry are urgently required.
V3890 Sagittarii (NR+E)
Alfredo Pereira (Carnaxide, Portugal) writes in vsnet-alert 23505:
This recurrent nova was found in outburst [sic] on 2019 Aug. 27.870 UT, mag 6.7.
Congratulations, Alfredo! This should be the third recorded eruption, which I had expected for about 2018 March. Previous eruptions occurred on 1962 June 2 and 1990 April 27.
In recent months I observed V3890 Sgr on almost every night (weather and moonlight permitting). Unfortunately tonight the sky has been overcast here, and the two previous evenings it was too cloudy or hazy low above my southern horizon.
Recent ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) data and light curve: https://asas-sn.osu.edu/light_curves/d0da704c-0426-4c88-9c43-b7a43085d9…
SGRV3890 20190827.048 <160g ASN
Failed observations on Aug. 27.76 UT?
SOAR spectroscopic confirmation of a new eruption of the recurrent nova V3890 Sgr
"We obtained spectra of V3890 Sgr with the Goodman Spectrograph on the SOAR telescope on UT 2019-08-27.98. The spectra show very broad P Cygni profiles of H I and He I lines and perhaps He II, N III, and Na lines as well. The absorption trough of H-alpha extends to at least 4200 km/s from the center of the emission component. This confirms a new nova outburst of the recurrent nova V3890 Sgr, the first since 1990.
V3890 Sgr was observed by the ASAS-SN survey over the last day, including a data point at UT 2019-08-27.05 where it was at its recent quiescent magnitude, and a point at UT 2019-08-27.75 where a magnitude is not reported. Inspection of the image suggests this is because the source was saturated."
Unfortunately they did not mention in ATel #13047 the following observation by Rod Stubbings: 2019 Aug. 27.521 UT, mv= 15.2 (still at quiescence).
Me and Ana (CAI) we will also give a try. Let's hope the weather cooperates. These days, observations have been hard in northwestern Portugal, due to night fog.
Nevertheless, our countryman, Alfredo, did the job!!