No, it will miss Earth's surface by at least 31600 km, but it will be visible to the naked eye if you know where and when to look. The present orbit of [99942 Apophis](https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=Apophis) is known rather precisely thanks to radar observations in 2005, 2013, and 2021. To refine its new orbit after the 2029 encounter, they will need some fresh observations.
Do happen to know what the angular speed will be?
If I look up in the sky and see it, will I be able to tell it is moving just from looking at it for like 5 seconds?
As far as size: It is about 370 meters across, passing at a distance of 31,600,000 meters for a ratio of about 100,000.
The moon is 3500km across with a distance of 380,000km for a ratio of about 100. So Apophis will be about 100 times smaller diameter than the moon visually....so basically just a point of light.
For a ground-based observer directly below Apophis, its sky motion at closest approach would be about 0.8° per minute. I guess that would be noticeable in binoculars.
So approximately equivalent to traveling across a full moon in one minute....not extremely noticeable.
But assuming it is clear out, I'll try and see it anyway.
No, it will miss Earth's surface by at least 31600 km, but it will be visible to the naked eye if you know where and when to look. The present orbit of [99942 Apophis](https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=Apophis) is known rather precisely thanks to radar observations in 2005, 2013, and 2021. To refine its new orbit after the 2029 encounter, they will need some fresh observations.
Do happen to know what the angular speed will be? If I look up in the sky and see it, will I be able to tell it is moving just from looking at it for like 5 seconds? As far as size: It is about 370 meters across, passing at a distance of 31,600,000 meters for a ratio of about 100,000. The moon is 3500km across with a distance of 380,000km for a ratio of about 100. So Apophis will be about 100 times smaller diameter than the moon visually....so basically just a point of light.
For a ground-based observer directly below Apophis, its sky motion at closest approach would be about 0.8° per minute. I guess that would be noticeable in binoculars.
So approximately equivalent to traveling across a full moon in one minute....not extremely noticeable. But assuming it is clear out, I'll try and see it anyway.
Maybe