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Old 23-05-2019, 10:46 AM
gary
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Asteroid (66391) 1999 KW4 set to make close approach - binary object

Asteroid 1999 KW4 will pass by Earth on May 25, 23:05 UTC at a distance
of 5,182,015 kilometers.

The 1.5m km diamater asteroid has its own moon, that is, it is a binary system.

It is expected to reach mag 12 and might be visually observable in as little as an 8".
It will be up in Puppis.

Story here :- https://www.cnet.com/news/walnut-ast...-its-own-moon/
More here :- https://earthsky.org/space/double-as...st-may-25-2019
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Old 26-05-2019, 10:50 PM
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AstroJunk (Jonathan)
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Spent a couple of nights observing this little rock(s) - Here's my best video of it from tonight:

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Old 26-05-2019, 11:10 PM
atkinsonr (Rich)
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mate, that's awesome
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Old 27-05-2019, 08:35 AM
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multiweb (Marc)
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Nice catch.
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Old 27-05-2019, 08:51 PM
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AstralTraveller (David)
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Great stuff! Totally fascinating. I couldn't wait to see how it ended.

I'm interested in the technicalities. What was the mag of the asteroid and what was the faintest mag seen? Also, what is the fov? Your web site says you use a TACOS_BD for occultations but this was done with a ZWO. New camera?
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Old 27-05-2019, 09:43 PM
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Thanks all!

David, yes I tend to use my ZWO ASI174MM-cool for everything now as it has many advantages of er the TACOSBD and only one issue - it can't be used with a video time inserter. The issue has been easily remedied with an NTP stamping protocol which gives me an absolute time base of +/- 2ms.

The asteroid was around 12.6 mag at the time, so the fainter stars are 15 and beyond. The FoV I used was about 30" across. I used a region of interest of 1280x720 and rather over exposed the image so that it would transfer to video without the need for post-processing. I am lazy sometimes
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Old 04-06-2019, 07:22 AM
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multiweb (Marc)
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Good article with pics from the ESO: https://www.eso.org/public/news/eso1910/
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