Re: 5919 Obs #28385

From: Björn Gimle via Seesat-l <seesat-l_at_satobs.org>
Date: Mon, 12 Sep 2016 15:42:36 +0200
Thanks to Mike for posting an appropriate elset which allowed me to stay up
and capture the next pass.
Trouble with aiming the camera gave me only two images.

28385 04 034B   5919 G 20160911231816500 18 25 2025110+313205 55 R
60
28385 04 034B   5919 G 20160911231831500 18 25 2030720+325165 55 R
60
28385 04 034B   5919 G 20160911231939500 18 25 2051533+370171 55 R
60
28385 04 034B   5919 G 20160911231954500 18 25 2057830+381360 55 R
60

I may be able to produce/verify the flash period by measuring each max (or
min) and combining the two images.


--------------------------------------------------------
Björn Gimle, COSPAR 5919
59.2617 N, 18.6169 E, 51 m
Satellite observation formats described:
http://www.satobs.org/position/IODformat.html
---------------------------------------------------------

2016-09-11 20:43 GMT+02:00 Björn Gimle <bjorn.gimle_at_gmail.com>:

> I noticed that the inttles "+MA" elset predicts tonight's pass for me
> (19:51 UT) 4.7 minutes earlier than my suggested "7 AOP".
> Also that "+MA" has 50% higher drag than the original old TLE, which I
> began to suspect.
> This probably means that it has completed seven more orbits than that
> elset predicted, ie almost a full day in error after 163 days.
>
> But the "+MA" still predicts a pass (at 42 deg alt in the SE for me) 2
> degrees higher than "7 AOP", like yesterday.
>
> So I recommend "+MA" until new obs arrive. I may still have clear skies !
>
> /Björn
>
> -----------------------------------------
>
> 2016-09-11 18:58 GMT+02:00 Björn Gimle <bjorn.gimle_at_gmail.com>:
>
>> Last night I found USA 179 r after a partial track scan. It was only 16
>> min early on the classfd 163 days old, yet after adjusting B* to fix the
>> time offset, it still predicted it 4 degrees above the obs at 42 deg alt in
>> the SSE.
>> With inttles the figures were 13 min and 3 degrees.
>> Actually, the drag effect could make for several orbits in error-
>> increasing from 0.1 orbit to 1.1 orbit requires only a 7% drag increase.
>> I also changed AOP+MA to get the track closer to my obs, it might be more
>> helpful for a few days.
>> But this TLE shows a discrepancy in the track angle.
>>
>> I'm at a loss as to which elements to adjust - more obs are needed.
>>
>> USA 179 r +7 AOP
>> 1 28385U 04034B   16091.25392007 0.00052500  00000-0  10019-2 0    00
>> 2 28385  57.3390 119.7392 3808439 262.3433 232.2776  7.88880991    03
>> USA 179 Rk +MA
>> 1 28385U 04034B   16254.46759977 0.00083586  00000-0  15065-2 0    00
>> 2 28385  57.3489 276.6181 3697518 341.0707  33.7470  8.10254303  1633
>>
>> IOD:
>> 28385 04 034B   5919 G 20160910201034500 18 25 2210700+140900 55 R
>> 28385 04 034B   5919 G 20160910201054500 18 25 2219900+160600 55 R
>>
>> --------------------------------------------------------
>> Björn Gimle, COSPAR 5919
>> 59.2617 N, 18.6169 E, 51 m
>> Satellite observation formats described:
>> http://www.satobs.org/position/IODformat.html
>> ---------------------------------------------------------
>>
>
>
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Received on Mon Sep 12 2016 - 08:43:18 UTC

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