[amsat-bb] Tiangong Re-entry on Heavens bove

[Joe]

It is because the amount of time it spends between 38 and 43 is longer 
than the lower latitudes.
Joe WB9SBD
Sig
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
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On 3/31/2018 7:55 PM, Robert Bruninga wrote:
>> Hi Bob, do you know the object number by chance?
> No, but this link shows that the higher probabilities or re-entry are
> between about 38 to 43 degree latitudes north and south.
>
> https://www.theguardian.com/science/2018/mar/30/chinas-tiangong-1-space-st
> ation-will-crash-to-earth-this-weekend
>
> Im not sure why those would be slightly higher.  43 degrees is its maximum
> excursion (matches its inclination)...  Maybe its because as it passes
> over the equatorial bulge, it sees the higher drag and that will start the
> demise which will occur then 20 minutes later?
>
> Bob
> -----Original Message-----
> From: Robert Bruninga
> Sent: Saturday, March 31, 2018 9:16 AM
> Subject: [amsat-bb] Tiangong Re-enetry on Heavens bove
>
> You can see the live track of Taengong to re-enter in the next 24 hours on
> http://www.heavens-above.com/
>
> Just remember, as it suffers increased drag, it will speed up and be ahead
> of classic predictions.
>
> But at least you can see when you are under the orbit as to whether it is
> worth going outside.  I 'd go out several minutes before the prediction
> since we dont know how quickly they are updating the elements as it speeds
> up.
>
> and even if it is daytime, you will see it if it comes in in your area...
>
> Bob
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>