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Special Notice #422: GDS_J1701281-430612 HST observations scheduled

September 30, 2016: Further to AAVSO Alert Notice 551, Dr. Mark Reynolds (University of Michigan) informs us that the cataclysmic variable GDS_J1701281-430612 will be observed by the HST/COS on

07 Oct 2016 at 00:23:57 UT

Quoting from the Alert Notice: "Beginning now and continuing through late October, V, R, and I photometry of GDS_J1701281-430612 is requested; the extinction in blue makes B photometry less valuable and is not recommended. Until October 1, nightly snapshots in VRI are requested to establish a baseline and follow   the target's behavior. From October 1, observations a few times per night are requested, then more frequently during the HST observations themselves at a cadence that allows for a good S/N. Following the HST observations, nightly snapshots are requested for about two weeks to provide context."

Please see the Alert Notice for additional details on this campaign.

Coordinates (2000.0):  R.A. 17 01 28.14  Dec. -43 06 12.3

Charts with a comparison star sequence for GDS_J1701281-430612 may be created using the AAVSO Variable Star Plotter (VSP). Be sure to include the underscore in the name. Observers should create an 'e' scale chart to see the sequence.

Please submit observations to the AAVSO International Database using the name GDS_J1701281-430612 exactly as written here.

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


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