15 October 2019 at 10:49 pm #574427
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.
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.16 October 2019 at 8:52 pm #581495
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.16 October 2019 at 8:56 pm #581496
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!16 October 2019 at 9:51 pm #581497
Thanks. Here’s a short movie taken a little later when it had cleared up. Still a very bright Moon in the sky.16 October 2019 at 10:08 pm #581498
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?17 October 2019 at 6:47 am #581499
That is a lot of objects to track and control too.17 October 2019 at 11:51 pm #581501Richard MilesParticipant
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.18 October 2019 at 2:43 pm #581502Robin LeadbeaterParticipant
I see the press are at it again 🙁
Asteroid alert: NASA warning as kilometre long space rock set to skim Earth at 25,000mph18 October 2019 at 5:45 pm #581503Roy HughesParticipant
Skim the earth at about 4 million miles distant.
New definition of skim I suppose.
Roy22 October 2019 at 7:11 pm #581521
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.22 October 2019 at 9:29 pm #581525
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.22 October 2019 at 10:44 pm #581527
Yes, 13.4 tonight and moving along at almost 18 arcsec/min.23 October 2019 at 10:09 pm #581533
36 x 20s midpoint 2019-10-23T19:32:34′ /UT
as a 5fps compressed movie, 5MB:26 October 2019 at 10:26 pm #581537
We survived, thank goodness. The Daily Express had me worried.27 October 2019 at 7:49 am #581538
David. Excellent. I can breath easy now.27 October 2019 at 5:12 pm #581540Tim HaymesParticipant
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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