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recurrent nova

Alert Notice 558: CI Aql monitoring needed to support HST observations

October 19, 2016: Dr. Edward Sion (Villanova University) has requested AAVSO observers' assistance in monitoring the recurrent nova CI Aql in support of observations with the Hubble Space Telescope Cosmic Origins Spectrograph scheduled for October 31 - November 2, 2016, and November 3 - November 5, 2016. These observations are part of a study on short orbital period recurrent novae as Supernovae Type Ia progenitors.

Alert Notice 556: Monitoring of V2487 Oph requested

October 4, 2016: Dr. Ashley Pagnotta (Louisiana State University) has requested AAVSO assistance in monitoring the recurrent nova V2487 Oph in order to catch and observe its next outburst.

Special Notice #415: T CrB brighter and bluer - monitoring requested

April 8, 2016: The symbiotic recurrent nova T CrB has entered a super-active state, and it is brighter and bluer than it has been since before its last outburst in 1946. Multicolor and visual ongoing observations are requested.

Special Notice #6: Rare Outburst of RS Oph

February 13, 2006: The recurrent nova RS Oph appears to be in a very rare outburst, as seen by the following AAVSO observations:

FEB 13.1631 2453779.6631 4.8 Visual RWG Wolfgang Renz, Germany

FEB 10.2100 2453776.71 11.0 Visual GRL Bjorn Granslo, Norway

FEB 08.2493 2453774.7493 10.9 Visual GZN Alfredo Gonzales-Herrera, Spain

The outburst was first detected by Kiyotaka Kanai (Gunma,Isezaki-shi) and Hiroaki Narumi (Ehime,Kita-gun) and reported to the VSNet-Alert mailing list.

Special Notice #191: U Sco is possibly in outburst

January 28, 2010: The recurrent nova U Sco has been reported in outburst, and confirming observations and immediate reporting are urgently requested.

U Sco is located at coordinates RA: 16 22 30.80 , Dec: -17 52 43.0 (J2000).

Special Notice #193: Request for photometry of the recurrent nova U Scorpii

February 8, 2010: Dr. Bradley Schaefer has requested increased optical coverage of the recurrent nova U Scorpii through the end of February 2010 at least. Of greatest interest are calibrated multicolor photometry to follow the evolution of the optical spectrum throughout the outburst, and intensive time-series photometry to study flickering in the system and to time the eclipses. Recent photometry of U Scorpii has indicated that the nova ejecta shell has become optically thin, making the central star visible again.

Special Notice #197: Request for time-series photometry of U Sco

March 2, 2010: Dr. Bradley Schaefer (LSU) requests intensive time-series observations of U Scorpii beginning immediately and continuing through 2010 March 4 08:00 UT (JD 2455259.83). These observations are requested in support of coincident X-ray photometry by the XMM-Newton satellite. The XMM-Newton observations, requested by Dr. Jan-Uwe Ness (ESA), will investigate the X-ray behavior of U Sco during its transition from outburst back to quiescence.

Alert Notice 497: Nova Sagittarii 2014 = PNV J18250860-2236024 AND Erratum

February 11, 2014

1. Event: Nova Sagittarii 2014 = PNV J18250860-2236024

Discovered by: Sigeru Furuyama (Tone-machi, Ibaraki-ken, Japan) and reported by S. Nakano (Sumoto, Japan)

Discovery magnitude: unfiltered CCD magnitude 8.7, using a 200-mm f/2.8 camera lens + BJ-42L camera

Discovery date: 2014 Jan. 26.857 UT

Coordinates: R.A. 18 25 08.60  Decl. = -22 36 02.4  (2000.0)

Alert Notice 496: Outburst of the recurrent nova V745 Sco

February 7, 2014

Event: Outburst of the recurrent nova V745 Sco

Discovery by: Rod Stubbings (Tetoora Road, VIC, Australia)

Discovery magnitude: 9.0 (visual)

Discovery date: 2014 February 6.694 UT

Coordinates:  R.A. 17 55 22.27   Dec. -33 14 58.5  (2000.0)

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