[amsat-bb] BY70-1

[Nico Janssen]

As long as we don't have stable TLEs it is not possible to perform
an analysis to determine the expected lifetime. But my initial
guestimate would be somewhere between 2 and 6 months.

73, Nico

On 30-12-16 19:43, Greg D wrote:
> 18:20 pass not as strong as prior passes.  Only got a few moments of
> full-quieting audio.  Contacts with W5ACM and KC7M.  As before, the
> second half of the pass was much better (nothing heard at all until just
> before indicated TCA), so perhaps the bird is late compared to the
> Keps.  Worked it almost into the ground before LOS.  I'm using
> 2016-083C, updated from Celestrak right before the pass.  Playing with
> polarization seemed to help, but I'm assuming the bird's antennas are
> linear, right?  Possibly my relays are getting dirty.
>
> One question, for scale...  We know that the satellite will not last
> "long", given it's crippled orbit.  How long?  Days?  Weeks?  Months?
>
> Greg  KO6TH
>
>
> Nico Janssen wrote:
>> If you are still using yesterday's TLE set, then you will indeed find
>> that BY70-1 is now about half a minute earlier. The problem is that
>> the TLEs for this satellite are not stable yet in the first days after
>> the
>> launch. The right value for e.g. the decay rate has not yet been
>> established. So for the time being you need to make sure you use the
>> most recent TLE set that is available.
>>
>> By the way, the two SuperView satellites are now using their own
>> propulsion system to increase their altitude, preventing an early decay.
>> As BY70-1 does not have any propulsion, it is stuck in its low orbit.
>>
>> 73,
>> Nico PA0DLO
>>
>>
>> On 30-12-16 13:42, PY5LF wrote:
>>> Hi
>>> We had a low pass over here minutes ago and i felt the keps BY70-1 are
>>> wrong .
>>> I start to hear 25 seconds before . Does anyone feels the same ?
>>> 73
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