HST campaign on 12 dwarf novae - Alert Notice 796

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

Affiliation
American Association of Variable Star Observers (AAVSO)
HST campaign on 12 dwarf novae - Timetable

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

Name (primary VSX name) R.A. (2000) Dec (2000) Range CV type HST window

Scheduled for/Completed

ZTF18acxhphf (Aqr) 22 52 37.05 -05 19 17.0 18.4-21.3 g IBWD+E October 2022 October 28 Nov 17 17:32:14 UT -  Nov18 00:50:55 UT
V479 And 00 18 56.93 +34 54 44.2 16.7-17.9 V AM: November 2022 December 2022
CH UMa 10 07 00.72 +67 32 47.5 10.7-15.3 V UG December 2022  
ASASSN-18dg (Eri) 04 07 49.30 -00 07 16.7 15.5-21.3 g UGSU/IBWD+E January 2023  
SDSS J080449.49+161624.8 (Cnc) 08 04 49.49 +16 16 24.9 17.8-19.1 CV IBWD February 2023  
SSS 100511:061754-362655 (Col) 06 17 53.83 -36 26 54.5 14.2-18 CV UG March 2023  
GP Com 13 05 42.40 +18 01 03.8 15.7-16.2 V IBWD April 2023  
SDSS J161909.10+135145.5 (Her) 16 19 09.10 +13 51 45.6 15.2-17.9 g UGZ May 2023  
HP Lib 15 35 53.07 -14 13 12.2 13.55-13.8 V IBWD+ZZB: June 2023  
V1082 Sgr 19 07 21.87 -20 46 50.5 13.4-15.6 V DQ: July 2023  
V584 Lyr 19 10 59.42 +28 56 38.7 14.3-19.6 V UG August 2023  
LL Lyr 18 35 12.82 +38 20 04.3 12.9-18.5 V UG September 2023  

Charts 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

Affiliation
American Association of Variable Star Observers (AAVSO)
Faintest comp star dots on target charts

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

 

ZTF18acxhphf HST observations postponed to November

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 

 

Affiliation
American Association of Variable Star Observers (AAVSO)
ZTF18acxhphf being observed with HST Nov 17-18

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

ZTF18acxhphf completed - next HST target CH UMa (December 1st)

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