Alex Pratt

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Viewing 20 posts - 161 through 180 (of 281 total)
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  • in reply to: Historical magnitude estimates of Betelgeuse #582956
    Alex Pratt
    Participant

    Hi Jeremy,

    It wouldn’t be possible to process such a large volume of unrecorded VS observations without the tenacious commitment of these Section members. I’m aware of cases where valuable observations have been lost after members passed away, e.g. by a house clearance or by wiping their computer drives. Thankfully, Melvyn’s family gave us full access to his extensive hoard.

    As I mentioned in VSS Circular 180, the BAA Memoirs contain some useful VS data, but perhaps like in the English Mechanic not all salient information is to hand. Yes, they are certainly worthwhile and rewarding projects to search for old observations and add them to the Association’s archives and databases.

    I’ve promised Roger I’ll write an update for the December VSS Circular.

         Alex.

    in reply to: C/2020 F3 (NEOWISE) #582820
    Alex Pratt
    Participant

    Hi David,

    Here’s an online article with pics taken from Whitley Bay…

    https://www.msn.com/en-gb/news/uknews/stargazers-urged-to-take-in-comet-that-will-not-return-for-68-centuries/ar-BB16Ihl8?ocid=msedgdhp

    I had to laugh when they wrote “Dr Robert Massey, from the Royal Astrological Society…”    🙂

    Clear skies,

         Alex.

    in reply to: Shower Calendar #582631
    Alex Pratt
    Participant
    in reply to: Refocussing meteor cameras #582509
    Alex Pratt
    Participant

    Hi Dominic,

    As William commented, my lenses also have a grub screw to secure the focus of the lens. As you’ll have experienced, focussing is quite a delicate operation with most video camera/lens combinations.

    My Leeds_SE camera sometimes drifts out of focus during the seasons. Often this is an acceptable amount of soft focus, then just as I’m about to shin up the drainpipe it moves back into hard focus again.

    I haven’t tried the masking tape technique. I suspected its expansion and contraction might cause some focus shift. I suppose it depends on the tightness of the rotating bezel.

    Cheers,

          Alex.

    in reply to: Still problems #582347
    Alex Pratt
    Participant

    Thanks Jeremy,

    I can confirm it plays very well from there and Members will find the presentation and discussion most interesting.

    Clear skies,

         Alex/

    in reply to: Still problems #582340
    Alex Pratt
    Participant

    Unlike previous weeks, this evening I cannot view the talk (Jeremy’s) on the YouTube feed. It is working OK for Zoom users. Is it working OK for other YouTube watchers?

    Alex.

    in reply to: Still problems #582336
    Alex Pratt
    Participant

    Hi Ray,

    I found that instead of directly clicking on an option I did right-click and selected Open a new window. This solved my Groundhog Day login problem.

    Cheers,

         Alex.

    in reply to: Strange website behaviour? #582330
    Alex Pratt
    Participant

    I tried to edit my latest entry on my Member’s Page to update the image. On clicking ‘Edit this observation’ – ‘Remove’ I got the error message

    Clear skies,

         Alex.

    in reply to: Website News and Help #582325
    Alex Pratt
    Participant

    Hi Pauline,

    Just click on the ellipsis and you’ll see all names displayed.

    Clear skies,

         Alex.

    in reply to: Gordon Taylor #582315
    Alex Pratt
    Participant
    Gordon was most helpful when I researched HMNAO’s Occultation Machine. I occasionally ‘phoned him to update him on current developments in occultation astronomy and the promise of Gaia’s astrometry.
    Gordon’s autobiography was published in JOA 2016-4 

    An obituary (written by Tim Haymes) will appear in the Journal.

         Alex.

    in reply to: Very bright Starlink train #582314
    Alex Pratt
    Participant
    My Leeds_SE video meteor camera picked up some of these peskies, one clip had 5 of them traipsing across the sky.
    I see that ‘improvements to mitigate the impact on astronomers’ weren’t evident last night. Hopefully the satellites will be fainter when they attain their final orbits.
    The Heavens Above website FAQ says:
    “The brightness of a spacecraft is influenced by several factors…our magnitude estimates should only be treated as a rough guide, and the actual brightness you see could be considerably more or less than this”
    ‘Enjoy’ the show!
          Alex.
    in reply to: Imaging Venus #582266
    Alex Pratt
    Participant

    Hi James,

    Issue 2014-04 of the Journal for Occultation Astronomy (pp. 13-22) contains an article by Friedhelm Dorst on ‘Observations of Planets and Stars near the Sun’.

    We deliberated for some time before deciding to publish it in JOA. We do not condone any attempts to carry out such observations. Observing near the Sun carries high risk to one’s eyesight. It only needs to go wrong once! Even if an observer uses electronic recording techniques, they can be tempted to cast a naked eye glimpse towards the Sun and incur dazzle.

    Be careful out there.

    Clear skies,

          Alex.

    in reply to: observing during the covid-19 crisis #582145
    Alex Pratt
    Participant

    Does ‘stay at home’ mean that we now shouldn’t spend any time observing from our back gardens? Automated systems are an advantage at the moment.

         Alex.

    in reply to: Starlink-3 photobombs 29P #582107
    Alex Pratt
    Participant

    Hi Denis,

    Just wait until Scotland’s Spaceport is in operation and they start buzzing rocketplanes over your head…    🙂

    Clear skies,

         Alex.

    in reply to: Royal Mail stamps issued for the RAS bicentennial #582023
    Alex Pratt
    Participant

    Apart from debating “Whatever did the Romans do for us…” and the varied comments about the artwork, I agree that it’s great to see astronomy on the new stamps.

    If it encourages some youngsters to take an interest in our fascinating hobby / science it will all be worthwhile.

         Alex.

    in reply to: Royal Mail stamps issued for the RAS bicentennial #582020
    Alex Pratt
    Participant

    “He’s not an astronomer, he’s a very naughty boy…!”

    Well, in my astronomical library Messrs Bone, Moore, Sidgwick et al write about aurorae, novae, and supernovae, so after decades of such usage it now grates on my ears to attend talks about ‘auroras’, etc.

    I’ll say tomato…

         Alex.

    in reply to: Betelgeuse #582006
    Alex Pratt
    Participant

    American media inform us that Betelgeuse is ‘fainting’, so perhaps we need some interstellar smelling salts to help it recover from its current swoon…

    in reply to: Favourable Quadrantids #581873
    Alex Pratt
    Participant

    Hi Colin,

    That’s a really nice set of radio data. During that time there is only a low level of activity from minor showers, and the ever-present sporadics, so we can assume the plots give a good approximation of Quadrantid rates.

    The NEMETODE peak of 04:45 UT was derived from combining several years’ data and the individual years will have profiles that are affected by sub-peaks, brief drops in meteor flux, etc. The peaks suggested by the IMO and the BAA Handbook Meteor Diary were based on slightly later solar longitudes. The maxima derived from visual, video, radio and professional radar systems can differ in time because they can be detecting meteors from different sized meteoroid bodies and particle-sorting takes place in the stream, etc.

    In some cases a bright meteor seen visually won’t have been detected on radio, and a very good radio trace wasn’t picked up by video cameras. I guess these are examples of optimal / non-optimal radio detection alignments.

    We had awful conditions for visual and video work this week, so I’ll ask our radio observers to have a look at your extensive coverage.

    I’m surprised we aren’t a nation of radio astronomers.

         Alex.

    in reply to: Favourable Quadrantids #581871
    Alex Pratt
    Participant

    Hi Peter,

    I’m pleased that your efforts were rewarded with a good number of Quadrantid meteors.  I’m sure the Meteor Section would be pleased to receive a formal report even though you observed under difficult conditions where the limiting mag and sky clarity varied so much.

    Cheers,

        Alex.

    in reply to: Christmas Meeting #581749
    Alex Pratt
    Participant
    The two lectures and the Sky Notes were excellent presentations and the location is most convenient, adjacent to Kings Cross station.
    One constructive comment – the bright spotlights directed both onto the audience and the display screens detracted somewhat from my enjoyment of the talks, washing out some of the rich colours in the graphics and diluting the fine details in members’ astro images. The YouTube recording is clearer in this respect.
    Clear skies,
         Alex.
Viewing 20 posts - 161 through 180 (of 281 total)