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I know nothing about solar imaging but is it just me or is there less detail at the 5 o’clock position compared to the 11 o’clock? If so, could that be indicative of tilt?
I posted a few minutes ago, but it vanished.
Heres a quick look at what BAA members have published on VNs in recent years. Some are notes and some full papers. Its not a fast publication rate but respectable and 2 new papers are likely in 2026. Apologies to anyone whose paper I missed.
2005 Hind’s Variable Nebula – Hewitt
2012 PV Cephei and Gyulbudaghian’s Variable Nebula – Boyd
2015 Five Year light Curve of the Herbig Haro Ae Star PV Cephei – Boyd
2019 The Many Faces of Gyulbudaghian’s Nebula – Privett et al
2020 Update on PV Cephei and Gyulbudaghian’s Nebula – Boyd
2020 Brief Further Update on PV Cephei – Boyd
2022 Observations of V347 Aur and its associated reflection neb – Sargent
2022 R CrA and cyclic variations in NGC6729 – Evans/Privett
2023 Brightness variations in R CRA and NGC6729 – Privett/Evans
2024 Variable Nebula Report – Privett/SargentI got curious to see what BAA DSS/VSS members had done on variable nebulae. Some are full papers and some are notes…
Apologies to anyone whose paper I have missed….
2005 Hind’s Variable Nebula – Hewitt
2012 PV Cephei and Gyulbudaghian’s Variable Nebula – Boyd
2015 Five Year light Curve of the Herbig Haro Ae Star PV Cephei – Boyd
2019 The Many Faces of Gyulbudaghian’s Nebula – Privett et al
2020 Update on PV Cephei and Gyulbudaghian’s Nebula – Boyd
2020 Brief Further Update on PV Cephei – Boyd
2022 Observations of V347 Aur and its associated reflection neb – Sargent
2022 R CrA and cyclic variations in NGC6729 – Evans/Privett
2023 Brightness variations in R CRA and NGC6729 – Privett/Evans
2024 Variable Nebula Report – Sargent/PrivettMy plan is to write a paper on 347 Aur this summer and from Richard Sargent’s brief at the DSS meeting, it looks like he is working on one about Hind’s variable nebula – so thats probably 2 papers for the BAAJ in 2026.
Its not a great publication rate but it is respectable I think.
Richard and Callum can speak to this far better than me but, I for one don’t post all my VN images on the Gallery – as most users are certainly not as interested as I am.
For the record, in that period, I observed:
PV Cep+Gyul – 9 times
V347 Aur – 16 times (it underwent a flare during the nice weather)
Borisov’s – once
Hinds – 3 times – deeply several others shallow
McNeil’s – 4 times
Thommes – none
NGC1333 – noneAnd I’m only one observer, so I suspect more is going on than is apparent.
When it comes time to write an annual summary of whats going on, then I’m sure Richard knows he can rely on most active observers to supply copies of their images.
Richard,
Will have a look at the gallery and see if I have any images older that those I have already placed on it. 3 at least I suspect, probably going back to mid 90s. Of course, people didn’t usually stack more than 20 or 30 images then (I had to write my own code to do it) – and Pentiums weren’t exactly nippy. Bill Gates declaration that “640kB should be enough for anyone” was already a joke.
Will look this evening.
Grant
EDIT: 1997, 2007, 2017, 2018,2019 now in the gallery…
I would also add in the period when the Eyjafjallajokull volcano in Iceland saw aircraft grounded too – that saw an unusually long run of blue skies too.
It might take some of the fun out of the discussion for the journalist, but by looking at VIIRs imagery for London over (say) the last 10 years you should be able to see what has happened in recent years as the measured upwelling radiance would need to be constant before you could safely attribute more stars to NO2 levels and the ULEZ.
Something like…
The website now actually offers the option for trend analysis on the light pollution levels. Impressive how dark some of the Motorways have become.
Perhaps upwelling blue light is scattered more strongly and never reaches space and so gives a false impression.
By comparison my home location has seen a small rise in light pollution as new house builds seem occupied by people afraid of the dark (despite every phone having a torch inbuilt) – even out here in the boonies where a crime is a major event!
Half decent display here near Salisbury at just after 20:00 UT. Didn’t last long though.
https://britastro.org/observations/observation.php?id=20250416_222637_de6f50341ab31fe8EDIT: I forgot to change the time on my camera. This should read “after 21:00”.
Hmm. I shall have a look at that. Python is very easy so its an attractive option. Wonder if I should stick with ASCOM rather than Alpaca for simplicity but worried anything I do might become redundant in a few years if they are moving away from COM.
Oh well, no excuse then but to use github for the first time and try Visual Studio – which I downloaded years ago and got rid of fairly quickly after I tried to convert a GUI intensive VB6 program to .NET. It wasn’t a happy experience.
Truth be told, a large chunk of my last 10 years has been spent developing software for image processing pretty much in a team of 1. I wrote IDL (or later Python) and its run from command line. My understanding of the ASCOM/Alpaca/Github universe is wafer thin… 🙂
Looks like one of my old laptops is about to be resurrected for this. Be warned, there may be immoderate language…
Does anyone know if theres a latency issue with using Python rather than another language?
Morning Ian,
Thanks for replying. I knew there must be people out there that do this sort of thing but you never get to hear who they are as its a touch niche.
Python sounds great as my progression has been Fortran/Algol/6502/Z80/C/IDL/Python down the decades and I certainly have a spare RPi knocking about…
So, how does it work then? Does it, for every possible taskable type of instruction, issue a command line process calling a Python instance while perhaps storing info in files or environmental variables? I’m intrigued.
I’m fairly certain you can call dlls from Python, so this sounds hopeful.
The ASCOM/Alpaca website said newbies should use their templates – for fear of people picking up bad habits from others – but then failed to say where said templates were. It strikes me as site designed by enthusiasts for other enthusiasts and with way too few examples. Thats said, its a hell of a piece of work.
Sounds rather like a pass of new Starlink satellites.
If you have a look at the Heavens Above website at https://www.heavens-above.com/ you should be able to find out which ones…
This quite good for cloud forecasts too….
https://www.meteoblue.com/en/weather/outdoorsports/seeing/salisbury_united-kingdom_2638664
Yeah, wooden roll off seem less dew laden. I was an occasional user of one thats 10 years old and only now showing need of TLC. I only once encountered water on the scope optics when opening up.
As it happens, I ordered an additional dewheater which arrived yesterday. I will try mounting that down by the mirror cell of my Newtonian and leave it on when not observing. I shall see what happens.
I will also start assembling the RPi bits for a longer term project.
