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Special Notice #413: SU UMa observations needed now

February 23, 2016: Deanne Coppejans (Department of Astrophysics, Radboud University Nijmegen) requests observations of the dwarf nova SU UMa now in order to determine its status. She and colleagues observed it on 20 February 2016 with the Very Large Array (VLA) and need to know whether it is (was) in outburst.

Observations of SU UMa in the AAVSO International Database from around the time of the VLA observations show it to be in quiescence:

Feb. 17.8722UT, <13.7 (MUY, E. Mullyaert, Oostende, Belgium);
Feb. 20.8181, <13.4 (OJR, J. Ripero, Madrid, Spain);

but the observations are sparse and there are no observations between these two observations or since Ripero's one of Feb. 20. Observations prior to Muyllaert's confirm that SU UMa was in quiescence for at least several days.

Two requests are being made now:

- Please observe SU UMa and report its status to the AAVSO. Time series are not necessary. If SU UMa is in outburst, please monitor it until it has returned to minimum.

- If you have recent observations of SU UMa, particularly from Feb. 17 to the present, please submit them to the AAVSO as soon as possible.

Coordinates: R.A. 08 12 28.28  Dec. +62 36 22.3  (2000.0)

AAVSO finder charts for SU UMa with comparison stars may be generated using the AAVSO Variable Star Plotter (VSP).

Please submit your observations to the AAVSO International Database using the name 'SU UMA'.

This AAVSO Special Notice was compiled by Elizabeth O. Waagen.


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