› Forums › Variable Stars › UV Per
- This topic has 16 replies, 5 voices, and was last updated 6 months ago by
Gary Poyner.
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28 July 2024 at 2:20 pm #623903
Gary Poyner
ParticipantThe 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
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This topic was modified 6 months, 2 weeks ago by
Gary Poyner.
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This topic was modified 6 months, 2 weeks ago by
Gary Poyner.
29 July 2024 at 10:41 am #623908Mr Ian David Sharp
ParticipantThanks Gary,
Will give it a go!
Cheers
Ian29 July 2024 at 11:14 am #623909Mike Harlow
SpectatorTook 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.29 July 2024 at 5:44 pm #623912Gary Poyner
ParticipantMike,
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
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This reply was modified 6 months, 1 week ago by
Gary Poyner.
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30 July 2024 at 8:47 am #623918Mr Ian David Sharp
ParticipantHi 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
Ian30 July 2024 at 10:34 am #623920Mike Harlow
SpectatorThanks 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 6 months, 1 week ago by
Mike Harlow.
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30 July 2024 at 1:48 pm #623923Gary Poyner
ParticipantThank 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,
Gary30 July 2024 at 3:25 pm #623924Magnus Larsson
ParticipantHi!
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
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30 July 2024 at 6:14 pm #623927Mr Ian David Sharp
ParticipantThat’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.1 August 2024 at 8:02 am #623991Mr Ian David Sharp
ParticipantHi all,
I managed a time-series run again last night – see attached.
It’s now down around mag. 17.5 in V.
Cheers
Ian.1 August 2024 at 10:29 am #624007Gary Poyner
ParticipantGood 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
1 August 2024 at 12:14 pm #624009Magnus Larsson
ParticipantThanks, 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
1 August 2024 at 1:59 pm #624011Robin Leadbeater
Participantposted in wrong thread- deleted
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This reply was modified 6 months, 1 week ago by
Robin Leadbeater.
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This reply was modified 6 months, 1 week ago by
Robin Leadbeater.
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1 August 2024 at 3:09 pm #624017Mr Ian David Sharp
ParticipantIs 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:
2 August 2024 at 7:56 am #624040Mr Ian David Sharp
ParticipantA few more measurements in V uploaded this morning.
Cheers
Ian.7 August 2024 at 2:10 pm #624179Mr Ian David Sharp
ParticipantI’ve uploaded results from last night. Now slipping back to nearly mag 18 in V again.
Cheers
IanAttachments:
7 August 2024 at 3:08 pm #624181Gary Poyner
ParticipantGood work Ian. So, no superoutburst then. Oh well. Wouldn’t be much fun if we could predict them.
Gary
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