[amsat-bb] AMSAT-OSCAR 85 TLEs

[Nico Janssen]

All,

Initially the TLEs for the GRACE Cubesats were published only via:
http://mstl.atl.calpoly.edu/~ops/grace_tle/GRACE_OPM_TLE.txt

Meanwhile more recent TLEs can be found in this list:
http://mstl.atl.calpoly.edu/~ops/keps/kepler.txt

Using these TLE sets I find that AO-85 is closest to object 90747,
GRACE_47. Actually AO-85 is now about 10 s early compared to the
TLEs of object 90747.

I assume Cal Poly will keep these GRACE elements up-to-date in the
coming days, like they do with the ULTRASat TLEs.

73,
Nico PA0DLO


On 2015-10-10 22:38, Jerry Buxton wrote:
> Nico,
>
> The first keps we got were based on the OPMs at the time of P-POD
> deployment per the telemetry.
> We will likely not receive any others until NORAD starts tracking them,
> perhaps in a few days.  Still, those will not be available to the
> general public (from what I understand), they will be posted in our
> AMSAT keps when we get them.
>
> Thank you for the information on the frequency drift!
>
> Jerry Buxton, NØJY
>
> On 10/10/2015 15:31, Nico Janssen wrote:
>> All,
>>
>> Hours after the launch of AO-85 (ex FOX-1A) the first TLEs for 8 of
>> the 13 launched Cubesates were published under GRACE 1 through 8.
>> I have not seen any updates since launch day.
>>
>> Today around 18:00 UTC AO-85 was 29 s early compared to the TLE set for
>> GRACE 8, which is currently leading the group. AO-85 is 41 s early
>> compared to the TLE set for GRACE 2, that most people will be using now.
>>
>> So either the early TLEs were not very accurate yet, or the TLEs for
>> AO-85 were not yet determined and therefore not available in the
>> initially measured batch. Let's hope we get updated TLEs for all 13
>> Cubesats soon.
>>
>> BTW, there appears to be a small temperature drift on the downlink
>> signal frequency of AO-85 that may be noticable when using automatic
>> doppler correction.
>>
>> 73,
>> Nico PA0DLO
>>
>>
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> _______________________________________________
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