Photometry requested for DDE 155 (ZTF18abmbdyk)
Abstract:
DDE 155 (ZTF18abmbdyk) is a dwarf nova with suspected orbital period bellow 1 hour. Its magnitude in filter g ranges between 16.6 and 21 due to outbursts and superoutbursts. We would like to obtain light curves from multiple nights, each covering about 2 hours or longer time span, to detect orbital variations. Ideally, we would like the observations to be taken during outbursts and superoutbursts, where we expect the variations in brightness to be the largest.
Justification:
Determining the orbital period of DDE 155 will help us to classify this target, which is suspected to have an orbital period below the period minimum of cataclysmic variables.
Requested Data Types:
Photometry
Targets
| Name | Magnitude | Variability Type | Photometry Notes | Spectroscopy Notes |
|---|---|---|---|---|
| DDE 155 | 16.20 | UG |
Cadence: Custom Precision: 100 |
Not Requested |
Spectroscopy Lines:
No spectroscopy lines provided
Photometry Filters:
V (Johnson), R (Cousins), Other (Please Specify)
Comparison Stars:
Finder charts with comparison stars may be created using the AAVSO Variable Star Plotter (VSP, https://apps.aavso.org/vsp/). An F-scale chart is recommended to see the faintest comparison stars.
Co-Authorship
Observers are eligible for co-authorship.
Additional Observer Input:
Photometry cadence: 2 hours or more per run, as many nights as possible, exposure duration as necessary to give the best S/N obtainable with your equipment. Photometry filters in order of priority: CV, CR, V, R. Due to the low brightness of the target, unfiltered photometry is requested in order to achieve the best signal-to-noise ratio. In conditions which allow for filtered photometry, Johnson V or Cousins R would be the most suitable ones. Also, while outbursts and superoutbursts occur frequently, their precise occurrence can't be predicted. It is therefore necessary to check the brightness of the target at the start of observations to determine whether it is bright enough to obtain usable photometry.
Additional Submission Location:
Not provided
Forum URL
https://forums.aavso.org/t/observing-campaign-904-photometry-requested-for-dde-155-ztf18abmbdyk/3012
Notes:
No public notes