SS Cyg monitoring continues for radio campaign

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SS Cyg monitoring continues for radio campaign

文章 PTS » 週三 06 4月, 2016 08:42

AAVSO Special Notice #414
April 5, 2016

SS Cyg monitoring continues for radio campaign

Further to AAVSO Alert Notice 536
(, close monitoring
of the cataclysmic variable SS Cyg is urgently requested. Immediate
notification of the beginning of the anticipated outburst is crucial
and is requested.

The success of the multiwavelength (radio and optical) observing
campaign on SS Cyg underway depends on immediate reporting of
outburst behavior to trigger multi-site radio observations.

In addition to triggering multi-site radio observations of SS Cyg
in research on radio emission from this dwarf nova, AAVSO
observations are used for correlation with the radio data during

Dr. James Miller-Jones writes: "As we decided a month or so ago,
the anomalous/slow-rise outburst that eventuated last time around
was not conducive to accurate triggering of our approved e-MERLIN
radio observations. We therefore decided to hold off on triggering
e-MERLIN until the next outburst, which should be beginning at
some stage over the next week or so. We will once again have full
AMI-LA radio coverage, but this time the e-MERLIN observations
should provide both higher sensitivity and higher resolution at
three epochs during the outburst. We are also requesting much
denser Swift X-ray coverage of the rise and decay phases.

"Given all that, might the AAVSO be able to provide good coverage
of the upcoming SS Cyg outburst? While getting the trigger
notification as early as feasible is our most immediate concern,
so that we can alert Swift, AMI and e-MERLIN, we would also be
very grateful for good optical monitoring of the full outburst..."

Please keep a very close watch on SS Cyg. Visual and CCD/DSLR
(particularly V) observations are requested (no time series unless
outburst is underway and radio observations have been triggered).
Its normal minimum magnitude is ~11.8 V, but it can fluctuate to
around 11.5. If it becomes brighter than 11.5 V, it could well be
going into outburst. If it reaches 11.0, it is almost certainly on
its way up.

Please report your observations of SS Cyg to the AAVSO as soon
after you make them as possible. If you see it 11.5 or brighter,
please report them immediately.

Coordinates: RA 21:42:42.8 Dec. +43:35:10 (2000.0)

AAVSO finder charts for SS Cyg 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 'SS CYG'.

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


Information on submitting observations to the AAVSO may be found at:


A Special Notice archive is available at the following URL:

Subscribing and Unsubscribing may be done at the following URL: ... ialnotices


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