[Mr Ian David Sharp]

Maxim Usatov wrote:

Looks like the system is bright at about 10.8 – 10.6 V mag and quite active. (Please ignore dim measurements – I think clouds interfered, so the whole ensemble was skewed. I will avoid submitting that to the database.) Can anyone confirm?

Max

Hi Max,

Looks like business as usual. Here are my V results from last night and also all my obs. since April. No major changes going on as far as I can tell.

Cheers
Ian

Attachments:

1. 

   20240702_T-CRB_V_PixelSkies-C11_IDS_plot_points.png
   

2. 

   TCrB.jpg
   

[Mr Ian David Sharp]

Mr Ian David Sharp wrote:

I took a series of 17 exposures early this morning from my C11 in Spain over an hour. It varied at between 16.7 and 16.8 in the V band. See attached.

Sorry, here’s the graph which I neglected to attach!

Attachments:

1. 

   20240702_TCP-J200237033947002_V_PixelSkies-C11_IDS_plot_lines.png
   

[Mr Ian David Sharp]

Hi all,

I took a series of 17 exposures early this morning from my C11 in Spain over an hour. It varied at between 16.7 and 16.8 in the V band. See attached.

I’ve also attached a screen shot with the field in AstroArt with the 5 ref and one check star I used. All the comp stars came from the AAVSO chart X36870MV.

WE have 2 entries in the BAA photometry database – one for TCP J20023703+3947002 and one for AT 2024lwu and I’ve uploaded my results to both. As Magnus mentions above, the AAVSO use TCP J20023703+3947002 in VSX.

Cheers
Ian.

Attachments:

1. 

   Screenshot-2024-07-02-081243.jpg
   

[Mr Ian David Sharp]

Maxim Usatov wrote:

Great multi-band series, Ian!

Thanks Max!

It’s still very quiet…

Ian.

Attachments:

1. 

   TCrb_Max-1.jpg
   

[Mr Ian David Sharp]

Well, the outburst is definitely over, and much narrower that the previous one. See attached.

Cheers
Ian.

Attachments:

1. 

   ss_cyg_all_over.jpg
   

[Mr Ian David Sharp]

Hi Max,

Here are my results from last night. I’ll try and get longer runs tonight.

Cheers
Ian.

Attachments:

1. 

   TCrb_Max.jpg
   

[Mr Ian David Sharp]

Hi all,

Looks like the recent outburst is, all but, over. An interesting divergence of the R and V magnitudes as it faded. See attached.

Cheers
Ian.

Attachments:

1. 

   T-CrB.jpg
   

[Mr Ian David Sharp]

Maxim Usatov wrote:

T CrB oscillations tonight.

Hi Maxim,

Yes, I see considerable variability (and variability of variability night on night!). You can see the vertical spread over each night on this plot. I usually take 40 to 60 images per filter per night. It’s hard to display as the points get very bunched and I would have to expand just one or two nights to see the details.

Also, overall since April, T CrB has been quite steady especially in the past two or three weeks.

Cheers
Ian.

Attachments:

1. 

   T-CrB-variability.png
   

[Mr Ian David Sharp]

Good morning,

I’m pleased to report I haven’t missed a night in both V and R since the outburst. Here’s the light curve to date.

Cheers
Ian.

Attachments:

1. 

   ss_cyg_baa_lc.png
   

[Mr Ian David Sharp]

From the album: “There is no dark side of the Moon really – as a matter of fact it’s all dark”

[Mr Ian David Sharp]

Thanks Jeremy!

I’ve added a batch of R and V from last night. Looks like it’s at, or near to its peak.

Cheers
Ian.

Attachments:

1. 

   ss_cyg_baa_out3.png
   

2. 

   ss_cyg_baa_out4.png
   

[Mr Ian David Sharp]

Now all my R and V data from last night is in the database. Here’s a zoom in to it.

Ian.

Attachments:

1. 

   ss_cyg_baa_out2.png
   

[Mr Ian David Sharp]

Mr Ian David Sharp wrote:

I’ve processed one set of V and one of V so far.

Should be R and V – sorry.
Ian

[Mr Ian David Sharp]

Yes!! I’m thrilled!

I captured 120 exposures in both R and V last night here in the UK and also in Spain. I’ve processed one set of V and one of V so far. See the attached light curves from both AAVSO and BAA databases. I’ve caught the rise right in the middle by the looks of things.

Ian.

Attachments:

1. 

   ss_cyg_aavso_out1.png
   

2. 

   ss_cyg_baa_out1.png
   

[Mr Ian David Sharp]

Thanks Gary,

I’m going to image it as long as I can tonight from here and Spain. Maybe I will detect a brightening over the night?

Ian.

[Mr Ian David Sharp]

My years ago, when I was a Physics undergraduate, we were shown this marvellous film (projected on film of course).

https://youtu.be/tbsdrHlLfVQ?si=VEQ55jLdgto6QjVU

[Mr Ian David Sharp]

Thanks Robin,

I measured it at V=14.59 and R=14.52 last night (2024-01-31 00:30)

Cheers
Ian.

[Mr Ian David Sharp]

Hi all,

Difficult to quantify, but one statistic I can quote is that I submitted 37,974 variable star measurements to the BAA Photometry database during 2023. This may sound a lot, but I regularly upload 100+ data points in any one observation as I focus on PCEB systems.

It’s only because I have a system in Spain that I was able to do this. Having said that, there was a period from late May for 6 weeks in the UK where I had almost entirely clear skies.

Cheers
Ian.

[Mr Ian David Sharp]

Tony Vale wrote:

Have you tried the AAVSO ? I may be mistaken but I seem to remember that Bert Pablo, the staff astronomer, had some involvement with the development of PHOEBE2.

Hi Tony,

That’s a very good idea – thanks, I might try that.

In actual fact, I have persisted with this myself and I am now making quite good progress. I have finally managed to understand some of the key concepts and am getting some results out of Phoebe. This is good as I won’t have to ask so many very basic questions if I do contact someone.

Cheers
Ian.

[Mr Ian David Sharp]

Michael O’Connell wrote:

Folks,
My initial thoughts after successfully observing the occultation last night:

Excellent! Certainly more interesting than my drift trail!

Cheers
Ian.

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