I put the parameters from yesterday's TLEs into NASA's DAS software. The
mass is listed at 2 kg, so the unknown variable is the cross sectional
surface area. It's a 2U cubesat with deployed solar panels. With one
estimate, I got 6 days, which is obviously wrong. With another estimate, I
got 96 days.
73,
Paul, N8HM
On Fri, Dec 30, 2016 at 14:45 Nico Janssen <hamsat(a)xs4all.nl> wrote:
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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