Grant Privett

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  • in reply to: Interstellar asteroid A11pl3Z #630566
    Grant Privett
    Participant

    So, if you give ASTAP an ephemeris created by (say) JPL Horizons it align multiple images to keep the comet images stacked? Sounds nice.

    I see it runs under Windows and Linux – under Linux it could use Astrometry.net for platesolving. How is it doing it under Windows – using the comet’s predicted RA/Dec as the centre to search for star patterns? Plus possibly a hint at sensor pixels size and system focal length?

    How do you find it to use?

    in reply to: Interstellar asteroid A11pl3Z #630545
    Grant Privett
    Participant

    I contacted Fabio at AstroArt…

    “Thank you for your email. I discovered it last night, the hosting provider has problems. I hope they will fix it ASAP.
    If you need to download something, the mirror web site is available at: https://www.msbsoftware.it/astroart/

    So back on line soon one assumes.

    in reply to: Interstellar asteroid A11pl3Z #630542
    Grant Privett
    Participant

    Astroart allows you to input its speed of motion and position angle of the target to provide offsets…

    I imagine others use Astrometrica.

    in reply to: Interstellar asteroid A11pl3Z #630441
    Grant Privett
    Participant

    Blast! And with my pier in pieces…

    Anyone near Salisbury with an SDS drill? 🙂

    in reply to: Lunt driving me mad #629838
    Grant Privett
    Participant

    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?

    in reply to: Gyulbudaghian’s Nebula #629737
    Grant Privett
    Participant

    I 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/Privett

    My 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.

    • This reply was modified 2 months, 2 weeks ago by Grant Privett.
    in reply to: Gyulbudaghian’s Nebula #629733
    Grant Privett
    Participant

    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 – none

    And 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.

    in reply to: Gyulbudaghian’s Nebula #629720
    Grant Privett
    Participant

    Impressive how big the gap is currently between PV Cep and the first bright bit of nebula…

    Grant Privett
    Participant

    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…

    • This reply was modified 2 months, 3 weeks ago by Grant Privett.
    Grant Privett
    Participant

    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…

    https://www.lightpollutionmap.info/#zoom=9.00&lat=51.5156&lon=-0.1763&state=eyJiYXNlbWFwIjoiTGF5ZXJCaW5nUm9hZCIsIm92ZXJsYXkiOiJ2aWlyc19UUkVORCIsIm92ZXJsYXljb2xvciI6ZmFsc2UsIm92ZXJsYXlvcGFjaXR5IjoiNjAiLCJmZWF0dXJlc29wYWNpdHkiOiI4NSJ9

    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!

    in reply to: Possible aurora tonight (16th April) #629614
    Grant Privett
    Participant

    Aaargh. Yep. You’re right. Corrected post above. Will have a look at gallery now….

    in reply to: Possible aurora tonight (16th April) #629592
    Grant Privett
    Participant

    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_de6f50341ab31fe8

    EDIT: I forgot to change the time on my camera. This should read “after 21:00”.

    • This reply was modified 2 months, 4 weeks ago by Grant Privett.
    • This reply was modified 2 months, 4 weeks ago by Grant Privett. Reason: Grant is a moron
    in reply to: Creating ASCOM + ASCOM/Alpaca drivers #629581
    Grant Privett
    Participant

    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?

    in reply to: Creating ASCOM + ASCOM/Alpaca drivers #629558
    Grant Privett
    Participant

    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.

    in reply to: US administration looking to slash NASA science budget #629553
    Grant Privett
    Participant

    Is there anything like JPL Horizons anywhere else?

    in reply to: Satellites #629552
    Grant Privett
    Participant

    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…

    in reply to: Disadvantages of cooled camera #629466
    Grant Privett
    Participant

    The only disadvantage is a bigger battery if you are intending to observe away from home…

    in reply to: Weather App #628975
    Grant Privett
    Participant
    in reply to: Image processing bottle neck #627764
    Grant Privett
    Participant

    Surprising that Registax isn’t grabbing available CPUs. Wonder what its written in.

    in reply to: Image processing bottle neck #627759
    Grant Privett
    Participant

    What is the memory of the system and what else do you have running?

    What operating system?

    • This reply was modified 5 months, 3 weeks ago by Grant Privett. Reason: Because I'm a moron
Viewing 20 posts - 1 through 20 (of 509 total)