[Mr Ian David Sharp]

Hi all,

I managed a 5 hour run on ZZ Psc from Spain last night (18:15 to 23:20 UTC) and got a nice light curve with 271 points showing pulsations.

I’ve attached the light curve and my Peranso Generalized Lomb-Scargle analysis which shows a strong periodic component at 0.242 hours. I’ve also attached the phase-folded view which looks quite convincing.

Cheers
Ian.

Attachments:

1. 

   20251103_ZZ-Psc_V_PixelSkies-C11-Moravian_IDS_plot_lines_check.png
   

2. 

   ZZ-PSC-Peranso.png
   

[Mr Ian David Sharp]

Richard Miles wrote:

It should encourage others to follow suit by publishing in the MNRAS, which does not have page charges and is open-access.

Thanks Richard,

We had to plead poverty to have the charges waived!

Cheers
Ian.

[Mr Ian David Sharp]

Jeremy Shears wrote:

The team has done this previously, iirc, and would be welcome to do so again.

Thanks Jeremy,

We would like to do that again…will be in touch.

Ian.

[Mr Ian David Sharp]

Stewart John Bean wrote:

VSX gives a period of 90min for V1159 Ori.

Hi Stewart,

Well, I’m not in Spain but my kit is. I’ll try and get a really long run on it to see if I can pick up the period. The weather in Spain is not cooperating!

Cheers
Ian.

[Mr Ian David Sharp]

Hi all,

Here’s a run I did on V1159 Ori the night before last from my C11 in Spain (2025-10-27). Interesting short term variability. The SNR of the target star was around 100. The average V mag was 14.89 over the 21 frames.

I will carry on monitoring it…

Cheers
Ian.

Attachments:

1. 

   V1159-ORI.png
   

[Mr Ian David Sharp]

Thanks Jeremy – a really enjoyable day!

Cheers
Ian

[Mr Ian David Sharp]

Hi folks,

I’m looking forward to the meeting tomorrow. I’m staying in the nearby Premier Inn on Saturday night rather than drive straight back to the South Coast afterwards. So, will be available for a beer!

Cheers
Ian.

[Mr Ian David Sharp]

Hi Paul,

Are you uploading your images to the image gallery? I can’t see your recent images there. That’s the best place for them as you will get them in front of more people and can input all the details etc. Also, you might get selected for a Picture of the Week!

Cheers
Ian.

[Mr Ian David Sharp]

Mr Ian David Sharp wrote:

I am asking £1000 ono.

Reduced to £800 !

[Mr Ian David Sharp]

Tony Vale wrote:

Excellent photometry and analysis as ever

Many thanks Tony,

The best paper I can find is this one from 1993 and there does not seem to be a modern analysis as far as I can see.

Photometry of EF Pegasi during Superoutburst

The authors say the following in the abstract:

EF Pegasi was observed photometrically during a superoutburst in 1991 October. Superhumps seen during these observations were best fit with a period of 2h .09. This period is used to determine a likely orbital period of 2h .05 and a mass ratio (M_2/M_1) of 0.26. Distance estimates for EF Peg give values of 250 to 600 pc.

Cheers
Ian.

[Mr Ian David Sharp]

Tony Vale wrote:

<p class=”wp-dark-mode-bg-image”>Isn’t this object likely to show superhumps during a superoutburst ? VSX lists an orbital period of 2.01 hours

Hi Tony,

Thanks. Just to prove your point here’s a long run of nearly 7 hours on EF Peg from last night in Spain. (2025-08-30 19:46 to 2025-08-31 02:28 UTC). The superhumps are very clear and you can see the Lomb-Scargle period analysis gave 2.0988 hours!

Cheers
Ian.

Attachments:

1. 

   EF-Peg-Period.png
   

[Mr Ian David Sharp]

Gary Poyner wrote:

Yep, it’s very tricky to measure. It’s easier visually. Unscrew your camera…;-)

How about this, Gary…this from last night – just over an hour.

Cheers
Ian.

Attachments:

1. 

   20250829_EF-Peg_V_PixelSkies-C11_IDS_plot_lines_check.png
   

[Mr Ian David Sharp]

I also did a Generalised Lomb-Scargle period analysis in Peranso (Using my long run on 22nd). It seems there is a periodic strong component of about 0.07 days.
See attached.

Cheers
Ian.

Attachments:

1. 

   DX-And-Peranso.png
   

[Mr Ian David Sharp]

Gary Poyner wrote:

I’ve been looking at your t/s this afternoon, and it does indeed look interesting. Good stuff!

Thanks Gary,

Got it again last night – see attached. I think the peak might have been the previous night as it’s fainter by about a tenth of a mag.

Will keep at it…

Ian.

Attachments:

1. 

   20250823_DX-And_V_PixelSkies-C11_IDS_plot_lines_check.png
   

[Mr Ian David Sharp]

Hi all,

HT Cas now fading down to 16th/17th mag in V after being at 12-ish. Also, the big pre-eclipse humps seem to have gone, or reduced.

See last night’s run attached.

Ian.

Attachments:

1. 

   20250804_HT-CAS_IRB_PixelSkies-C11_IDS_plot_lines.png
   

[Mr Ian David Sharp]

Wow! Proper motion – who’d have thunk it!?

Thanks for the replies chaps.

Cheers
Ian.

[Mr Ian David Sharp]

Gary Poyner wrote:

That’s exactly what it is Ian – orbital hump just prior to eclipse. I’ve seen these before visually, and it can take you by surprise!

Thanks Gary,

Here are two more eclipses from last night. Getting slowly fainter overall.

Ian.

Attachments:

1. 

   20250730_HT-CAS_V_PixelSkies-C11_IDS_plot_lines_check.png
   

[Mr Ian David Sharp]

Jeremy Shears wrote:

Very nice photometry, Ian.
Looks like a pre-eclipse hump (due to accretion hot spot).

Thanks Jeremy,

I’ll keep monitoring it and get longer and longer runs on it as we get our nights back!

Ian.

[Mr Ian David Sharp]

Hi all,

A better image from me. This time 36 x 90s with L filter.

https://britastro.org/observations/observation.php?id=20250728_122425_2b3fb6faab2f3379

I measured the V mag to be 17.5 +/-0.1 using an aperture radius of 12 pixels (0.48 “/pix) with APASS V mag band.

Ian

• This reply was modified 3 months, 1 week ago by Mr Ian David Sharp.
• This reply was modified 3 months, 1 week ago by Mr Ian David Sharp.
• This reply was modified 3 months, 1 week ago by Mr Ian David Sharp.

[Mr Ian David Sharp]

Dr Paul Leyland wrote:

Nice one Cyril

…nice one son…let’s have another one!
😉

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