HST campaign on 12 dwarf novae - Alert Notice 796

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

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

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

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

AAVSO Alert Notice 810 reports on the scheduling of ASASSN-18dg with HST on 2023 February 10-11 and of SDSS-J080449.49+161624.8 on February 16.  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

Do we have a date, time scheduled for this UG yet?

I've gotten it a few times but it is at a very low altitude for me.

Jim DeYoung (DEY)

Dear All, 

The HST observations of SSS 100511:061754-362655 are scheduled between March 23rd and 24th. 
I'll post here the exact time once it is known.

This object underwent into outburst on February 21st and it is now back to quiescence at V~18.5.
This target seems to outburst on short recurrence time but, given the recent outburst, there are high chances that the HST observations will be successful.

It would be great if you could keep monitoring it, with few data points per night. 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
 

Alert Notice 818 reports on the exact times of HST observations on 2023 March 24 of the cataclysmic variable SSS 100511:061754-362655. 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

Visual observation tonight shows SSS 100511:061754-362655 has risen further to outburst.

2023 Mar. 17.49310   15.3  Mar. 17.52780   15.3

Regards,

Rod.

Dear Rod and Jim, Dear All, 

Thanks for your updates.

Indeed, the target has been in outburst since the 16th and, at the moment, is as bright as V~14.5
The HST observations are scheduled for the 24th (at 03:08 UT) and the HST team will review the light curve of the object on the 23rd, around 12:00 UT.
Any data from the next few nights would be extremely helpful to verify the behaviour of the source.
Hopefully the target will start going back to quiescence soon.

A big thanks to you all for your help!

All the best,
Anna
 

Dear All,

The scheduling for our program has been slightly modified and no targets have been observed in April.
In May, HST is going to observe two stars: SDSS J161909.10+135145.5 (SDSS1619) and GP Com.

The observations of SDSS1619 are scheduled for next Friday, May 5th, between UT 02:26 - 08:08.
Any data you can collect between today and tomorrow will be very useful to provide the HST team with the information necessary for the approval.

At the moment, the target is coming out of an outburst and is as bright as V~16.6 and it should be safe for the HST detectors.

The observations of GP Com instead are scheduled for May 25th, the exact time is TBC.
Thanks for your continuous monitoring of this target, any data you can collect in the next ~20 days will also be very helpful.

Thanks a lot and clear skies!
Anna