AAVSO Alert Notice 558
October 19, 2016
CI Aql monitoring needed to support HST observations
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.
It is essential to know 24 hours prior to the HST COS observations
that CI Aql is not in outburst, in order to protect the
instrumentation. Observers are asked to keep an eye on CI Aql with
nightly snapshot images (V preferred) from now until November 12,
and to report their observations promptly. It will be especially
important to know the brightness of CI Aql each night for October
28 through November 7 UT. Visual observations are welcome.
CI Aql (Nova Aql 1917) has had recurrent outbursts in 1941 and
2000, brightening to V~8.5. At minimum it is V~16-16.5 or fainter.
Coordinates (2000.0): R.A. 18 52 03.57 Dec. -01 28 39.4
Charts with a comparison star sequence for CI Aql may be created
using the AAVSO Variable Star Plotter (VSP, https://www.aavso.org/vsp).
Observers need to be aware that the field of view is complicated
by some comparison stars appearing as close doubles.
Please submit observations to the AAVSO International Database
using the name CI AQL.
This campaign is being followed on the AAVSO Observing Campaigns
webpage (https://www.aavso.org/observing-campaigns). A thread has
been created on the Campaigns and Observation Reports forum at
This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.
ACTIVITY AT A GLANCE
New outbursts and unusual activity reported in the last 72 hours
Last updated 01:00 UT October 26, 2016
# indicates a noteworthy or unusual outburst
: indicates confirmation required
'Activity At A Glance' is gleaned from observations reported to AAVSO MyNewsFlash, BAAVSS-Alert, CVnet-Outburst, VSObs-share and VSNET-outburst. We sincerely thank all the observers who contribute timely observations and reports of activity to these email lists.
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