Asteroid Apophis Flyby

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jeff.stevens
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Asteroid Apophis Flyby

Post by jeff.stevens »

There’s an interesting article on SpaceWeather about the flyby of the asteroid 99942 Apophis over the weekend.

It is due to make its closest approach to earth in 2029, April 13, when it will be visible to the naked eye.

I vaguely remember the excitement it caused back in 2004, when prior to its orbit being refined it caused a bit of a scare.

Best wishes, Jeff.
SkyBrowser
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Re: Asteroid Apophis Flyby

Post by SkyBrowser »

I had a quick look at its track. In April 2029 it'll be just to the east of the Great Square of Pegasus, so doable, but it'll need to be spotted just after sunset or just before sunrise, depending on when it's predicted to be brightest I suppose. Luckily the Moon is more or less new :)
Kay Burton
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Re: Asteroid Apophis Flyby

Post by Kay Burton »

It is very interesting to know the exact time when the asteroid can be seen. Are there any more accurate calculations in which time zone at what time the asteroid will be visualized?
SkyBrowser
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Re: Asteroid Apophis Flyby

Post by SkyBrowser »

Not that I've found! I used JPL to generate an ephemeris for 2029, but the quoted magnitudes are, I imagine, somewhat speculative! And plenty of time for things to change. Here are a few values around the time of maximum brightness -

2029-Apr-11 00:00 14 08 33.39 -29 58 55.3 10.744
2029-Apr-12 00:00 14 04 47.12 -29 34 31.4 9.801
2029-Apr-13 00:00 13 53 06.15 -28 13 32.0 8.147
2029-Apr-14 00:00 03 24 26.71 +36 19 47.2 10.
2029-Apr-15 00:00 00 51 01.39 +19 18 21.8 22.
2029-Apr-16 00:00 00 43 36.45 +18 01 00.0 22.

All times in GMT. I've no idea why they quote magnitude to 3 decimal places! Zooming in a little to the day of the maximum -

2029-Apr-13 00:00 13 53 06.16 -28 13 32.9 8.147
2029-Apr-13 01:00 13 52 03.92 -28 06 02.8 8.042
2029-Apr-13 02:00 13 50 55.78 -27 57 46.7 7.931
2029-Apr-13 03:00 13 49 40.84 -27 48 37.2 7.815
2029-Apr-13 04:00 13 48 18.05 -27 38 25.1 7.693
2029-Apr-13 05:00 13 46 46.09 -27 26 59.4 7.563
2029-Apr-13 06:00 13 45 03.33 -27 14 05.7 7.426
2029-Apr-13 07:00 13 43 07.75 -26 59 26.2 7.279
2029-Apr-13 08:00 13 40 56.78 -26 42 37.7 7.121
2029-Apr-13 09:00 13 38 27.10 -26 23 09.6 6.952
2029-Apr-13 10:00 13 35 34.38 -26 00 21.2 6.769
2029-Apr-13 11:00 13 32 12.80 -25 33 16.5 6.570
2029-Apr-13 12:00 13 28 14.46 -25 00 37.0 6.352
2029-Apr-13 13:00 13 23 28.21 -24 20 28.7 6.112
2029-Apr-13 14:00 13 17 37.93 -23 30 00.4 5.846
2029-Apr-13 15:00 13 10 19.36 -22 24 43.8 5.549
2029-Apr-13 16:00 13 00 54.29 -20 57 15.1 5.220
2029-Apr-13 17:00 12 48 19.05 -18 54 32.8 4.860
2029-Apr-13 18:00 12 30 39.65 -15 51 50.9 4.484
2029-Apr-13 19:00 12 04 13.20 -10 57 49.4 4.113
2029-Apr-13 20:00 11 20 55.54 -02 19 32.5 3.799
2029-Apr-13 21:00 10 01 58.91 +13 24 32.4 3.780
2029-Apr-13 22:00 07 38 10.90 +33 10 22.7 4.848
2029-Apr-13 23:00 04 57 42.68 +39 19 10.3 7.
2029-Apr-14 00:00 03 24 26.26 +36 19 43.7 10.

I don't now think it'll be visible in the UK in the evening - it's down near Gamma Pegasus (Algenib). It ought to be doable, in binoculars, about an hour before sunrise. But, a lot of water under the bridge before then :wink:
michael feist
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Re: Asteroid Apophis Flyby

Post by michael feist »

To quote from Roger Dymock's asteroid book, ' [99942] Apophis will pass close to the Earth in 2029, and, if it passes through a keyhole just 610 m wide, it will receive a gravitational nudge that will put it on a collision course wit out planet in 2036'. regards maf ... [by then I will be a the a nonagenarian...or gone].
Kay Burton
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Re: Asteroid Apophis Flyby

Post by Kay Burton »

Excellent count! Thank you so much. At least roughly I understand now when to expect this event. I think it will be possible to clarify the data closer to the date of the approach of the asteroid. There are still several years of waiting left. The main thing is not to forget during this time and not to miss it.
Brian
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Re: Asteroid Apophis Flyby

Post by Brian »

< Asteroid Apophis impact ruled out for at least a century >
"Just in case it was on your list of things to worry about, new observations of the asteroid Apophis have ruled out any chance of an Earth impact for a least a century"

from:
https://astronomynow.com/2021/03/26/ast ... f01d50547c
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brian livesey
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Re: Asteroid Apophis Flyby

Post by brian livesey »

A century from now they’ll easily be able to deal with rogue comets and asteroids. In fact, with proper planning they could do it now.
brian
jeff.stevens
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Re: Asteroid Apophis Flyby

Post by jeff.stevens »

brian livesey wrote: Fri Apr 02, 2021 8:26 pmIn fact, with proper planning they could do it now.
Surely it’s just a case of calling Harry S. Stamper (aka Bruce Willis) isn’t it?

Happy Easter, and Best Wishes, Jeff.
Eva Braun
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Re: Asteroid Apophis Flyby

Post by Eva Braun »

In 2029 Apophis will be visible to ground observers in the Eastern Hemisphere without the aid of a telescope or binoculars.
stella
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Re: Asteroid Apophis Flyby

Post by stella »

Just 8 years to go.
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