UV Per

[Gary Poyner]

The long period UGSU star UV Per is in outburst – the first recorded since June 2020.

July 28.056 12.8 visual
July 28.215 12.80C (Slooh Canary 2)

Too early to say whether this is a superoutburst or not, but any observations would be welcomed – especially time series.

PLease report to the DB asap, as the annual reports will be written for the Journal after August 1st, and anything reported later than August 7 might not be included.

Gary

• This topic was modified 4 months, 2 weeks ago by Gary Poyner.
• This topic was modified 4 months, 2 weeks ago by Gary Poyner.

[Mr Ian David Sharp]

Thanks Gary,

Will give it a go!

Cheers
Ian

[Mike Harlow]

Took an image this morning using iTelescope. Looks more like mag 14.5 through the red filter used.
Image in the members gallery at: https://britastro.org/observations/observation.php?id=20240729_072219_3fa14af2888e7f59
I would be interested to see your SLOOH image.
Mike.

[Gary Poyner]

Mike,

It was fainter this morning – visual 13.7 on July 29.076. The Slooh image this morning measured at 14.012C on July 29.1063

Here is a cropped gif from the Slooh image you requested.

The quick fade probably suggests a normal outburst, but it might also be a precursor to a superoutburst. UV Per did this many years ago and caught everyone on the hop.

Gary

• This reply was modified 4 months, 2 weeks ago by Gary Poyner.

Attachments:

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   uvper280724-2146.gif
   

[Mr Ian David Sharp]

Hi Gary,

I managed a run of 106 images last night from here in Ham. It was swinging around 16.5 in V.

Graph attached, data in the database.

Cheers
Ian

Attachments:

1. 

   20240730_UV-PER_V_Ham-Observatory-Selsey-UK_IDS_plot_lines_check.png
   

[Mike Harlow]

Thanks Gary,
I imaged it again this morning and as you say it is fading very rapidly. Comparison image attached. Each field is 14 x 14 arc minutes, north up, through a red filter using iTelescope T5

• This reply was modified 4 months, 2 weeks ago by Mike Harlow.

Attachments:

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   UV_Per_fade_20240730.jpg
   

[Gary Poyner]

Thank you both Mike and Ian.

That’s an interesting time series Ian. Quite an amplitude of variation during that rapid fade. Don’t have much to compare it with though, so we’ll have to see what happens. The duration of the outburst points to a normal one, but as I mentioned above, this might be a precursor – so if you can, please keep your (digital) eye on it during the next week if possible.

Lovely day here yesterday, but low cloud came over as darkness fell, so only a CCD measure from me…

July 30.0861 16.522C (Slooh 2)

Cheers,
Gary

[Magnus Larsson]

Hi!

Here’s another sequence from last night, from Malmö, Sweden. It was fainter than I expected (thus lower SNR).

Observations uploaded to databases (in a few minutes).

Magnus

Attachments:

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   UV_Per.png
   

[Mr Ian David Sharp]

Gary Poyner wrote:

That’s an interesting time series Ian. Quite an amplitude of variation during that rapid fade.

Hi Gary,

Yes, and the time series from Magnus is very similar. The faintness caught me out a bit last night and I only got a SNR of about 20, so tonight I’ll increase exposure a tad and try for another long run.

Cheers
Ian.

[Mr Ian David Sharp]

Hi all,

I managed a time-series run again last night – see attached.

It’s now down around mag. 17.5 in V.

Cheers
Ian.

Attachments:

1. 

   20240801_UV-PER_V_PixelSkies-C11_IDS_plot_lines_check.png
   

[Gary Poyner]

Good work Ian and Magnus. Amplitude still quite large! I wonder if this will re-brighten?

Is this data merged with the 16.3V companion, or has that been extracted? Just curious.

Gary

[Magnus Larsson]

Thanks, Gary!

Well, I did not handle the companion 🙁 But checking it in Phoranso, that I use for measurement, it is clearly outside of the aperture. So should not be confounding the measurement.

I can not go deeper from my back yard, but if it is of interest, I could try capture a series with our remote telescope in Spain..?

Magnus

[Robin Leadbeater]

posted in wrong thread- deleted

• This reply was modified 4 months, 2 weeks ago by Robin Leadbeater.
• This reply was modified 4 months, 2 weeks ago by Robin Leadbeater.

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   novavul_2024_skysubzonespng.png
   

[Mr Ian David Sharp]

Gary Poyner wrote:

Is this data merged with the 16.3V companion, or has that been extracted? Just curious.

Hi Gary,

Here’s a zoomed section of one of my images from last night when it was about magV 17.5 in AstroArt showing the 6,3,3 apertures used. The ref star on the right is the companion I think. It is number 4 in the list shown. This is 120 secs binned 2×2 with my C11 in Spain.

Tonight I’ll try with the L filter and go 180 secs.

Cheers
Ian.

Attachments:

1. 

   UV-Per-AA8.png
   

[Mr Ian David Sharp]

A few more measurements in V uploaded this morning.

Cheers
Ian.

[Mr Ian David Sharp]

I’ve uploaded results from last night. Now slipping back to nearly mag 18 in V again.

Cheers
Ian

Attachments:

1. 

   UV-Per_mag18.png.jpg
   

[Gary Poyner]

Good work Ian. So, no superoutburst then. Oh well. Wouldn’t be much fun if we could predict them.

Gary

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