SU UMa observations needed now

[PTS]

AAVSO Special Notice #413

February 23, 2016

SU UMa observations needed now

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. 17.8722 UT, <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;
https://www.aavso.org/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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