Affiliation
American Association of Variable Star Observers (AAVSO)
Thu, 10/26/2023 - 20:46

Alert Notice 838 announces the targets and approximate schedule for the third year of the HST CV observing campaign by Pala et al. 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-2023-2024
 - Cataclysmic Variables: https://www.aavso.org/hst-campaign-dwarf-novae-2023-2024-01

Please subscribe to these threads if you are participating in the campaign so you can be updated, ask questions, and join in the discussion!

Many thanks, and Good observing,

Elizabeth O. Waagen, AAVSO HQ

Affiliation
American Association of Variable Star Observers (AAVSO)
Contact info

Hello.

How do we get in touch with Drs Pala and Kupfer? We have some questions for them. Thank you, Grady

Affiliation
American Association of Variable Star Observers (AAVSO)
Intro and committment

Hello Dr Pala and Dr Kupfer.

My name is Grady Boyce and my father, Pat Boyce, and I run a non-profit educational foundation focused on Astronomy. We would like to participate in this project.

Here is what we can offer to your project:

Two PWI CDK-17 scopes, equitorially mounted, and run via ACP. We have JC-V on both of these. Our south scope (BARO) uses a FLI ProLine 4710 camera, and the north scope (BARON) uses a QHY600 CMOS. Due to the location of the observatories, we'll be limited to a Declination greater than -15.

Question for you both: Would it be ok if we included a student graduate of ours in this program to help Boyce Astro and interface with you as well? These students are well vetted and we'll only provide reliable sources to the project.

Appreciate this opportunity, and look forward to chatting with you. Grady Boyce (grady@boyce-astro.org)

BF Eri scheduled for November 10

Dear All,

Thanks a lot for joining this campaign!
The HST observations of our first target, BF Eri, have been scheduled for 

Nov 10, 2023 02:58:57    Nov 10, 2023 07:05:35  - UT time

It would be very helpful if you could continue 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 (i.e. Nov 9), in order for the HST team to finally approve their execution.

Good luck with the observations!

Thank and all the best,
Anna 

 

BF Eri failed

Dear Normand, dear All,

Unfortunately the observations of BF Eri weren't successful. Because of a failure, the COS shutter didn't open and no data were recorded. We'll be working with the HST team to re-observe this object. Most likely, this is going to happen later next year therefore, for the moment, there is no need to observe this target anymore. I'll keep you posted on any news about the re-scheduling.

Thanks a lot anyway to you all for your data and work.  

Regarding the next target, KZ Gem, we still don't have a date for the observations. I'll post here as soon as I have more details.

All the best,
Anna

Affiliation
American Association of Variable Star Observers (AAVSO)
BF Eri to be observed with HST - Alert Notice 839

Alert Notice 839 announces the HST observing schedule on 2023 November 10 for the cataclysmic variable BF Eri. 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-2023-2024
 - Cataclysmic Variables: https://www.aavso.org/hst-campaign-dwarf-novae-2023-2024-01

Please subscribe to these threads if you are participating in the campaign so you can be updated, ask questions, and join in the discussion!

Many thanks, and Good observing,

Elizabeth O. Waagen, AAVSO HQ

Affiliation
American Association of Variable Star Observers (AAVSO)
ASASSN-20pv

ASASSN-20pv has had an outburst as of last night.

ASASSN-20pv    231203.631   132.

The last outburst was in January 2022 and had several rebrightenings over the following four months.

 

ASASSN-20pv

Hi Rod,

Thanks a lot for this update!
This is very helpful since the HST observations are expected to be happen in March. Hopefully, there will be enough time for the target to go back to a deep quiescence by then.

Thanks,
Anna

Affiliation
American Association of Variable Star Observers (AAVSO)
BEWARE: KZ Gem close companion

Please note that KZ Gem has a close 14.5 mag companion just 7 arcsec north of the variable. Looking at this rich starfield on DSS images there are actually a couple more stars very close to KZ Gem similar in brightness to the variable when it's faint. Take a look at the light curve generator and it's obvious that some observers are measuring the wrong star or are at least including the companion in their measurement aperture: KZ Gem appears to be 14.5 mag and 17.0 at the same time!

If you can't reliably separate the two stars make sure you use an aperture large enough to include both stars and indicate that the reported magnitude is the combined light. Better yet, subtract the contribution of the companion before reporting an observation - there's a spreadsheet kicking around on the AAVSO site to do that; I think it is called "Nemesis". Given that KZ Gem's maximum magnitude in VSX is only 14.0, however, you'll need to be very careful since even during an outburst the combined magnitude won't be that much higher, and it will be hard to tell if the variable is bright.

Shawn (DKS)

Affiliation
American Association of Variable Star Observers (AAVSO)
BEWARE: KZ Gem close companion

I need to second this although the close star is actually shown as a 14.7 comp star on the chart that I am using (X34550BHK)-- I've noticed at least two observers doing what you mentioned (there may be more)-- reporting the brightness of the comp rather than the target.  Everyone be sure that your chart goes deep enough-- one of the observers in question is using a chart that only goes down to 14.5 (and has a really wide field of view) so he can't see that the 147 star is a comp star and not KZ Gem.   I sent HQ an email about the discrepant entries from the two observers several days ago, but so far the entries are still there-- maybe they just haven't gotten to them yet.

Tom (RTH)

Affiliation
American Association of Variable Star Observers (AAVSO)
ASASSN-18dg HST schedule set - Alert Notice 845

Alert Notice 845 reports on the HST observing schedule for ASASSN-18dg. 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-2023-2024
 - Cataclysmic Variables: https://www.aavso.org/hst-campaign-dwarf-novae-2023-2024-01

Please subscribe to these threads if you are participating in the campaign so you can be updated, ask questions, and join in the discussion!

Many thanks, and Good observing,

Elizabeth O. Waagen, AAVSO HQ

KZ Gem postponed - ASASSN-18dg to be observed on Jan 11th

Dear All,

At the end of November HST entered a safe mode and returned to science operations only in mid-December.
As a consequence, the scheduling for our program had to be revised and, unfortunately, the observations of KZ Gem have been postponed to a future date TBD. Nonetheless, the data you have obtained so far will still be very useful to understand the outburst recurrence time and better schedule the HST observations in the next possible window.

The HST team has decided to move to the target for January, ASASSN-18dg, which will be observed on January 11th. The exact time is not confirmed yet, and I'll post it here as soon as I have more details.

It would be very helpful if you could monitore this object for the next two weeks, 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 (i.e. January 10th), in order for the HST team to finally approve their execution.

Thanks to you all for work and I wish you all the best for the new year!
Anna

Exact time for ASASSN-18dg

Dear All,

The time of the HST observations of ASASSN-18dg is the following

Jan 11, 2024 20:15:00 - Jan 12, 2024 00:20:47  (UT time)

Any data you can collect tonight and tomorrow night (i.e. Jan 10) will be extremely useful for the HST team to finally approve the HST observations of this target.

Good luck with the observations!

Thank and all the best,
Anna 

Affiliation
American Association of Variable Star Observers (AAVSO)
ASASSN-18dg below 185

Greetings,

Took extra time to process last nights data and uploaded after your comment.  ASASSN-18dg was clearly below 185 in a 3x900s clear filter stack.

The 191 star seemed to be much fainter around 198 or so.  Still not sure if the 191 was on a few bad pixels or a real decline hence the <185 est.

High thin variable cloud as well didn't help.

Jim (DEY)

Affiliation
American Association of Variable Star Observers (AAVSO)
Still around magnitude 19

Got some data last night in difficult conditions (last bits of wind from the storm that just ripped through the South-East). I had to switch to CV to collect data faster between wind gusts. It looks like ASASSN-18dg was hanging around magnitude 19.2 on 2024 Jan. 10.22722

I should be able to get some V data tonight and will process it quickly to upload before going to bed (Jan 11th ~05:00 UTC)

 

JF (GJED)

ASASSN-18dg completed - SDSS08044+1616 scheduled for Feb 16th

Dear All,

Thanks for all the updates and the data you collected!

The HST observations of ASASSN-18dg were approved and were executed successfully. We got the entire data set without any problems with the instrument shutter, which affected some of the past observations. 

So thank you all for your support!

The next target in the schedule is SDSS J080449.49+161624.8, which will be observed on February 16th (exact time TBC).

It would be very helpful if you could keep monitoring this object 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 all the best,
Anna

Affiliation
American Association of Variable Star Observers (AAVSO)
Program stars update

Hi Anna,

BF Eri is in an outburst as of tonight 240110.495   132

ASASSN-20pv is still active at around 15.2 from its outburst in December 2023.

ASASSN-19ct is having a bright outburst starting last night 240109.583   136. This one has bright and faint outbursts. The last one was in June 2023 at 15.1

 

Cheers,

Rod.

 

 

about the upcoming targets

Hi Rod, hi All,

Thanks for the update and the data!

The observations of the outburst of BF Eri are going to be useful for us to refine the prediction for the outburst occurrence in the upcoming months, so that we can try to avoid repeating the HST observations in those months in which an outburst is most likely going to occur.

It finally looks like ASASSN-20pv is going back to quiescence, so I'm optimistic about the possibility of being able to successfully observe it with HST observations in March.

I'm also optimist for ASASSN-19ct, since the outburst is happening now, there are good chances for the HST observations in April to be successful.

So these are all good news for us :)

Cheers,
Anna

Affiliation
American Association of Variable Star Observers (AAVSO)
SDSS J080449.49+161624.8 scheduled with HST - Alert Notice 848

Link to the Alert Notice has been corrected - apologies! - Elizabeth

Alert Notice 848 announces the scheduling with HST of the CV SDSS J080449.49+161624.8 (Cnc). 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-2023-2024
 - Cataclysmic Variables: https://www.aavso.org/hst-campaign-dwarf-novae-2023-2024-01

Please subscribe to these threads if you are participating in the campaign so you can be updated, ask questions, and join in the discussion!

Many thanks, and Good observing,

Elizabeth O. Waagen, AAVSO HQ

Affiliation
American Association of Variable Star Observers (AAVSO)
Exact HST schedule SDSS J080449.49+161624.8 - Alert Notice 850

Alert Notice 850 announces the exact HST observing schedule on 2024 February 16-17 for the cataclysmic variable SDSS J080449.49+161624.8. 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-2023-2024
 - Cataclysmic Variables: https://www.aavso.org/hst-campaign-dwarf-novae-2023-2024-01

Please subscribe to these threads if you are participating in the campaign so you can be updated, ask questions, and join in the discussion!

Many thanks, and Good observing,

Elizabeth O. Waagen, AAVSO HQ

Affiliation
American Association of Variable Star Observers (AAVSO)
HST observing SDSS J080846.19+313106.0 Apr 5-6 -Alert Notice 857

Alert Notice 857 announces the scheduling with HST for April 5-6 of the CV SDSS J080846.19+313106.0 (Cnc). 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-2023-2024
 - Cataclysmic Variables: https://www.aavso.org/hst-campaign-dwarf-novae-2023-2024-01

Please subscribe to these threads if you are participating in the campaign so you can be updated, ask questions, and join in the discussion!

Many thanks, and Good observing,

Elizabeth O. Waagen, AAVSO HQ