1998 HL1: upcoming fly-by

Forums Asteroids 1998 HL1: upcoming fly-by

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  • #574427
    David Swan
    Spectator

    Alex Pratt made me aware of the upcoming (25 Oct) mag 12 fly-by of NEO 1998 HL1.

    It is already well within reach of amateur scopes.

    I’ve prepared a movie with my 36 x 20s subs from this evening. (10MB avi, runs at 5fps.) More detail on my member’s page.

    https://1drv.ms/v/s!Agvxu8wNOxpAgQXknraQXNhMTywE?e=BdtI0Y

    It runs at a poor resolution in the browser; if you download the avi it is much better. The moving asteroid is just left and down from centre.

    #581495
    Nick James
    Participant

    Thanks for the reminder. That’s a great movie. It is cloudy here in Chelmsford at the moment but I did have a few gaps earlier and caught the trail. It is currently around mag 15.3 moving at 7 arcsec/min.

    #581496
    David Swan
    Spectator

    Nice. Your stars are always nicely round across the field. The Hyperstar has such a tight critical focus zone. And I don’t always get it right!

    #581497
    Nick James
    Participant

    Thanks. Here’s a short movie taken a little later when it had cleared up. Still a very bright Moon in the sky.

    #581498
    David Swan
    Spectator

    Imagine what these videos will look like in a decade, when the sky is crowded with low earth orbit artificial satellite constellations a la Starlink. More to come?

     https://spacenews.com/spacex-submits-paperwork-for-30000-more-starlink-satellites/

    #581499
    Nick James
    Participant

    That is a lot of objects to track and control too.

    #581501
    Richard Miles
    Participant

    Thanks David for highlight this close approach.

    The apparition is on the list of favourable NEO approaches to the Earth in the 2019 BAA Handbook. It is especially easy to observe from the UK as the object is within a few degrees of the opposition point at a Declination of +13 deg when at its brightest (Oct 27). As such it is visible every evening between now and the end of the month, with it as bright as 12th magnitude from Oct 25 – Oct 28, before it finally heads off to southerly declinations and becomes inaccessible from here in the UK.

    #581502
    Robin Leadbeater
    Participant

    I see the press are at it again 🙁

    Asteroid alert: NASA warning as kilometre long space rock set to skim Earth at 25,000mph

    https://www.express.co.uk/news/science/1170826/asteroid-news-NASA-latest-space-rock-asteroid-1998-HL1-earth-danger-apocalypse

    #581503
    Roy Hughes
    Participant

    Skim the earth at about 4 million miles distant.

    New definition of skim I suppose.

    Roy

    #581521
    Nick James
    Participant

    Here’s a quick animation I obtained tonight while waiting for it to get dark. These are 10s exposures. 33×22 arcmin field, N up.

    #581525
    David Swan
    Spectator

    It’s quite bright now, isn’t it? (From your images.) It is overcast here, but I’m hopeful there will be clear patches in the next few days.

    #581527
    Nick James
    Participant

    Yes, 13.4 tonight and moving along at almost 18 arcsec/min.

    #581533
    David Swan
    Spectator

    36 x 20s midpoint 2019-10-23T19:32:34′ /UT

    as a 5fps compressed movie, 5MB: 

    https://1drv.ms/v/s!Agvxu8wNOxpAgQa1MQ6IzpDlrQVI?e=Wh6dD5

    #581537
    David Swan
    Spectator

    We survived, thank goodness. The Daily Express had me worried.

    https://youtu.be/ZTYQrgWi4gI

    #581538
    Nick James
    Participant

    David. Excellent. I can breath easy now.

    #581540
    Tim Haymes
    Participant

    I grabbed some frames last night between clouds and found the asteroid with 200mm F2,8 lens.  Image show the rapid motion over about 20mins.  Ive added it to my album on this site. Thanks to David and Nick for the thread on this interesting NEO.

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