CS Ind HST schedule set for August 30
Abstract:
Note: HST observations of CS Ind were carried out. Please continue nightly snapshots through Sep 13. - Elizabeth O. Waagen, Sep 3, 2024. --- Further to AAVSO Alert Notice 838 (https://www.aavso.org/aavso-alert-notice-838-backup-copy), Dr. Anna Francesca Pala (European Space Agency, ESAC, Spain) informs us that the cataclysmic variable CS Ind is scheduled to be observed with the Hubble Space Telescope on: 2024 August 30 00:37:21 - 03:58:19 UT. Beginning immediately, please observe CS Ind in V nightly through August 26, then a few times per night through August 30, then nightly through September 13. As with all targets for HST, a positive V measurement 24 hours before the scheduled HST time will be crucial so the HST team can make a go-nogo decision; the nights of August 27-28, 28-29 will be critical. Finder charts with comparison stars may be created using the AAVSO Variable Star Plotter (https://www.aavso.org/vsp). Submit observations to the AAVSO via WebObs using the name CS IND.
Justification:
CS Ind is one of the targets being covered in this, the third year of this campaign on cataclysmic variables. Optical coverage in V is essential to confirm that the target is not in outburst and so may safely be observed by HST. Without this confirmation, HST observations will not proceed. Optical coverage also allows for the HST observations to be analyzed in context of the optical behavior of the target. Coverage by AAVSO observers is therefore critical to this campaign.
Requested Data Types:
Photometry
Targets
| Name | Magnitude | Variability Type | Photometry Notes | Spectroscopy Notes |
|---|---|---|---|---|
| CS Ind | 11.50 | UGSU |
Cadence: Not Specified Precision: 100 |
Not Requested |
Spectroscopy Lines:
No spectroscopy lines provided
Photometry Filters:
B (Johnson), V (Johnson), Other (Please Specify)
Comparison Stars:
No comparison stars provided
Co-Authorship
Observers are not eligible for co-authorship.
Additional Observer Input:
Use comparison stars provided by the AAVSO. A minimum SNR~20 is requested. If the target is too faint to obtain the minimum SNR in V, switch to CV. If a target is observed going into outburst, please submit your observation(s) as soon as possible and begin obtaining multiple observations per night. Dr. Pala writes: "We know that some observers carry out time-series observations and also spectroscopy, and we welcome any additional contributions. Nonetheless the monitoring to assess quiescence should have the highest priority since, without it, there is the risk to lose the allocated orbits. "In case of time-series observations, an uninterrupted light curve in a single filter (preferably B or V) would be better than alternating with different filters. CV observations can still be useful but V-filter observations should be the priority (whenever possible). "DSLR observations, particularly if they are transformed to V, will be useful and are welcome. Visual observations will also be very valuable." FORUMS: The AAVSO Discussion forums are in transition. A forum thread was automatically created for this campaign under our new forum environment; the URL is given below and you are welcome to post there. For this campaign and target, the old forum threads will also continue to be accessible and show the history of this three-year campaign: Campaigns and Observing Reports: https://www.aavso.org/hst-campaign-dwarf-novae-2023-2024 and Cataclysmic Variables: https://www.aavso.org/hst-campaign-dwarf-novae-2023-2024-01 . IMPORTANTLY, the old campaign forums have the 2023-2024 table of targets and their observing status, so observers should look there as well as in the new forum.
Additional Submission Location:
none
Forum URL
https://forums.aavso.org//t/observing-campaign-869-cs-ind-hst-schedule-set-for-august-30/366
Notes:
No public notes