Affiliation
American Association of Variable Star Observers (AAVSO)
Wed, 10/19/2022 - 21:50
AAVSO Alert Notice 796 announces an observing campaign on 12 dwarf novae over the coming 12 months in support of HST observations; the first target is scheduled for late October. Please see the notice for details and observing instructions.
There are threads for this campaign under the following AAVSO forums:
- Campaigns and Observing Reports: https://www.aavso.org/hst-campaign-dwarf-novae-2022-2023
- Cataclysmic Variables: https://www.aavso.org/hst-campaign-dwarf-novae-2022-2023-01
Please subscribe to these threads if you are participating in the campaign so you can be updated. Join in the discussion or ask questions there!
Many thanks, and Good observing,
Elizabeth O. Waagen, AAVSO HQ
Below is the timetable for the 12 dwarf novae being observed with HST over the coming year (see Alert Notice 796). This table will be updated as each target is scheduled and after the HST observations have taken place.
Targets: October 2022 – September 2023
Scheduled for/Completed
October 2022October 28Nov 17 17:32:14 UT - Nov18 00:50:55 UTcompleted
November 2022Charts with comparison stars for the targets may be created using the AAVSO Variable Star Plotter (VSP). Please use WebObs to submit observations to the AAVSO International Database (AID).
Many thanks, and Good observing,
Elizabeth
If you are making charts for very faint targets (e.g., an 'F' or 'G' scale chart for ZTF18acxhphf), you will see that the dots for the faintest comp stars do not show. This problem has to do with VSP and is not able to be fixed at the present.
As a work-around, please choose the DSS chart option in VSP when creating the chart, which will show the actual sky and should enable you to identify the comp stars. Many thanks, and our apologies for the inconvenience.
Good observing,
Elizabeth
Dear All,
Thanks a lot for joining this campaign and for the latest data!
The observations of ZTF18acxhphf (originally scheduled on October 28th) have been postponed to November. The HST team had to update the schedule in order to favour another time-critical program.
For the moment, the plan is to observe both ZTF18acxhphf and V479 And in November.
We will post here when then new HST observing date will be confirmed.
As always, fell free to get in touch in case of any doubts or questions :)
All the best,
Anna
AAVSO Alert Notice 799 reports on the scheduling of ZTF18acxhphf with HST for 2022 November 17-18. Please see the notice for exact time, details, and instructions.
There are threads for this campaign under the following AAVSO forums:
- Campaigns and Observing Reports: https://www.aavso.org/hst-campaign-dwarf-novae-2022-2023
- Cataclysmic Variables: https://www.aavso.org/hst-campaign-dwarf-novae-2022-2023-01
Please subscribe to these threads if you are participating in the campaign so you can be updated. Join in the discussion or ask questions there!
Many thanks, and Good observing,
Elizabeth O. Waagen, AAVSO HQ
Dear All,
The HST observations of ZTF18acxhphf have been successfully completed, thanks a lot for your observations!
The next target is CH UMa, the HST team scheduled its observations for next week, between
Dec 1, 2022 21:56:52 - Dec 2, 2022 00:30:34 (UT time)
Your data show that CH UMa is in quiescence after the latest outburst in July.
It would be very helpful if you could keep monitoring this object for the next week, with few data points per night. In particular, it is crucial to obtain a positive detection of the target the day before the HST observations, in order for the HST team to finally approve their execution.
Thank you for all the data you have collected so far and good luck with the observations!
All the best,
Anna
Dear All,
The HST observations of CH UMa have been successfully completed. This was a difficult target given its frequent outbursts and your observations have been crucial to verify the quiescence state, so thanks a lot for all the data!
The next target is V479 And, the HST team scheduled its observations between
Dec 22, 2022 21:51:12 - Dec 23, 2022 03:33:56 (UT time)
It would be very helpful if you could keep monitoring this object for the next week, with few data points per night. In particular, it is crucial to obtain a positive detection of the target the day before the HST observations, in order for the HST team to finally approve their execution.
Thanks and good luck with the observations!
All the best,
Anna
AAVSO Alert Notice 805 reports on the scheduling of V479 And with HST for 2022 December 22-23. Please see the notice for exact time, details, and instructions.
There are threads for this campaign under the following AAVSO forums:
- Campaigns and Observing Reports: https://www.aavso.org/hst-campaign-dwarf-novae-2022-2023
- Cataclysmic Variables: https://www.aavso.org/hst-campaign-dwarf-novae-2022-2023-01
Please subscribe to these threads if you are participating in the campaign so you can be updated. Join in the discussion or ask questions there!
Many thanks, and Good observing,
Elizabeth O. Waagen, AAVSO HQ
Dear All,
Happy new year!
The HST observations of V479 And were successfully completed on December 22nd, thanks for all your observations.
Because of some difficulties with the scheduling, HST will not observe any of our targets in January, and our program will resume in February.
The observations of ASASSN-18dg have been scheduled for February 10th, and SDSS-J080449.49+161624.8 will be observed on February 16th.
It would be great if you could keep monitoring both of them, with few data points per night for the next weeks. As usual, it will be crucial to obtain a positive detection of each target the day before their HST observations, in order for the HST team to finally approve their execution.
Thanks and good luck with the observations!
All the best,
Anna