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recurrent nova

Alert Notice 599: CI Aql monitoring needed in support of HST observations

October 1, 2017 : 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 30 - November 6, 2017. These observations are part of a study on short orbital period recurrent novae as Supernovae Type Ia progenitors.

Special Notice #127: Twilight observations of U Sco requested

October 15, 2008

Alert Notice 567: IM Nor monitoring requested for HST COS observations

February 10, 2017: Dr. Ed Sion (Villanova University) and colleagues have requested AAVSO observers' assistance in monitoring the symbiotic-type recurrent nova IM Nor in support of observations with the Hubble Space Telescope Cosmic Origins Spectrograph scheduled for 2017 February 13 - 17 UT.

These observations are part of a study on short orbital period recurrent novae as Supernovae Type Ia progenitors.

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).

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