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1998 HL1: upcoming fly-by

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djswan2002's picture
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1998 HL1: upcoming fly-by

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.

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Thanks for the reminder. That

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.

djswan2002's picture
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Superb

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!

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And here's a movie

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

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Moving objects in the sky

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/

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That is a lot of objects to

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

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(162082) 1998 HL1 October favourable apparition

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.

Robin Leadbeater's picture
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in the press

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

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Thanks for that one...

Skim the earth at about 4 million miles distant.

New definition of skim I suppose.

Roy

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Here's a quick animation I

Here's a quick animation I obtained tonight while waiting for it to get dark. These are 10s exposures. 33x22 arcmin field, N up.

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'Killer'* NEO. *According to the Daily Express

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.

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Yes, 13.4 tonight and moving

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

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Update

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

as a 5fps compressed movie, 5MB: 

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

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djswan2002's picture
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1998 HL1 now moving away

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

https://youtu.be/ZTYQrgWi4gI

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Great timelapse

David. Excellent. I can breath easy now.

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1998 HL1 Last night

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.