[amsat-bb] BY70-1 decay estimate

[Nico Janssen]

All,

BY70-1 re-entered today 2017-02-18 at 00:19 UTC +/- 3 minutes near
11 degrees South, 159 degrees West.

73,
Nico PA0DLO


On 17-02-17 16:39, Nico Janssen wrote:
> All,
>
> BY70-1 may be expected to re-enter on February 18 around 01:05 UTC
> ± 1 hour.
>
> If you wish to track the satellite all the way to the re-entry, I 
> suggest you
> use the following TLE sets:
>
> After 2017-02-17, 19:00 UTC use this TLE set:
> BY70-1                                           180 x 153 km
> 1 41909U 16083C   17048.79504626  .12181346  12893+0  71409-3 0 99991
> 2 41909  97.5409 131.9041 0020298 184.6552 175.3259 16.39700464  8178
>
> After 2017-02-17, 20:30 UTC use this TLE set:
> BY70-1                                           174 x 150 km
> 1 41909U 16083C   17048.85604685  .15184949  20755+0  66732-3 0 99998
> 2 41909  97.5404 131.9770 0018254 184.4013 175.5826 16.41354756  8186
>
> After 2017-02-17, 22:00 UTC use this TLE set:
> BY70-1                                           167 x 146 km
> 1 41909U 16083C   17048.91697788  .20752091  42136+0  63726-3 0 99993
> 2 41909  97.5397 132.0500 0015727 184.1470 175.8399 16.43503239  8199
>
> After 2017-02-17, 23:30 UTC use this TLE set:
> BY70-1                                           156 x 140 km
> 1 41909U 16083C   17048.97781267  .34949706  12852+1  64507-3 0 99992
> 2 41909  97.5387 132.1232 0012260 183.8922 176.0983 16.46726667  8207
>
> 73,
> Nico PA0DLO
>
>
> On 16-02-17 21:19, Nico Janssen wrote:
>> All,
>>
>> BY70-1 may be expected to re-enter on February 18 around 01:00 UTC
>> +/- 3 hours.
>>
>> The apogee of the satellite has now decreased to 242 km and the perigee
>> has decreased to 176 km.
>>
>> 73,
>> Nico PA0DLO
>>
>>
>> On 12-02-17 13:27, Nico Janssen wrote:
>>> All,
>>>
>>> As a result of lower solar activity in the past week, the decay rate of
>>> BY70-1 has decreased. The satellite may now be expected to re-enter
>>> around February 16 to 19.
>>>
>>> The apogee of the satellite has now decreased to 313 km and the perigee
>>> has decreased to 191 km.
>>>
>>> 73,
>>> Nico PA0DLO
>>>
>