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 UT completedNovember 2022December 22-23 2022 completed
January 2023April 2023Charts 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
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 Jim,
Thanks for your message and sorry for the late answer.
The observations have been scheduled for between March 23rd and 24th, but the exact time is not known yet.
I'll post the exact time once I have more details.
All the best,
Anna
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
JD 2460019.52 16.30 (0.08). air mass 3.7
At my latitude I can only get it for about 10 to 15 minutes in late twilight before it goes into my tree line, not sure how much longer I will be able to get it.
If this is a rise to maximum then it would appear the current outburst interval is around 23 or so days.
Jim DeYoung (DEY)
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
Greetings,
2460026.51760 15.026 0.058 V
2460026.52472 14.928 0.031 V
2460026.53172 14.945 0.022 V
2460026.53875 15.008 0.026 V
Already uploaded to the AAVSO db.
Best regards,
Jim DeYoung (DEY)
Dear All,
Even if it was a challenging target, the ground based monitoring showed that the observations were safe for the detectors and HST successfully observed SSS 100511:061754-362655 on Friday morning.
Thanks a lot for all the data you provided!
In April, HST should observe GP Com. We'll post here once we have some news about the exact schedule.
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
Der All,
Although SDSS J161909.10+135145.5 was not back to quiescence, the HST observations went well and, thanks to your data, we will have additional information to interpret the UV data.
This week, HST will observe GP Com on 25 May 2023 21:37:48 - 26 May 2023 00:02:44 UT.
We will need to provide the final photometric observations on May 24th by 13:00 UT. The monitoring is showing that the system is stable at V~16 and any data that you can collected on the night of the 23rd will be very valuable to verify that the system is safe to be observed with HST.
Thanks for all your work and good luck with the observations!
All the best,
Anna
AAVSO Alert Notice 823 announces an observing campaign beginning immediately on the cataclysmic variables SDSS J161909.10+135145.5 (Her) and GP Com in support of HST observations. 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
AAVSO Alert Notice 825 reports on the scheduling of GP Com with HST for 2023 May 25-26 UT. 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