HST campaign on 12 dwarf novae - Alert Notice 796

Affiliation
American Association of Variable Star Observers (AAVSO)
Wed, 10/19/2022 - 22:02

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 (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

Observations of ZTF18acxhphf scheduled for this week

Dear All, 

The observations of ZTF18acxhphf have been scheduled between 

Nov 17, 2022 17:32:14  -  Nov 18, 2022 00:50:55 (UT time)

Thanks for the data you have been obtained so far, it looks like the target is in quiescence and hopefully will remain like that in the next few days.
Any data you can collect tonight and tomorrow night is going to be very helpful to assess the safety of the target for the HST detector.

Instead, V479 And has been postponed to December. The HST team will do their best to observe both V479 And and CH UMa in December.

Good luck with your observations :)

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