Re: DCB Obs MAY 11th UT - DMSP F18, USA 186, USA 179r, Lacrosse 5, USA 129 Planar Search

From: Björn Gimle via Seesat-l <seesat-l_at_satobs.org>
Date: Mon, 12 May 2014 20:54:37 +0200
The frequent abbreviations for TLE vaalues are not documented everywhere,
but you can read about them at
https://www.space-track.org/documentation#/tle
http://satobs.org/element.html

Your choice of MA = Mean Anomaly is excellent, because it specifies how
many 1/360 of the (anomalistic) period the satellite has travelled since
the last perigee Before elset Epoch. Thus it is a linear measurement of
time - if you increase it by 40 degrees for a 99 min period satellite, it
will be predicted to arrive 11 minutes earlier.

MM = Mean Motion is the number of  (anomalistic) periods/day, ie the period
is about 1440/MM

A large KeyHole maneuvre has in the past been a decrease by about 0.12.
These elsets differ by only -0.01 in MM, which results in +18 min, since
the elset is now 18 days old (and period is <=100 min)
It will also cause increments in the ENTIRE orbit by about 25 km ! Try them
!

/Björn

PS
I wish I could participate with actual search, but we have now a blue sky
even at true midnight. I might search for IGS 8 objects for another two
weeks, if we have a clear night. But USA 129 is MUCH too early !
DS




2014-05-12 15:47 GMT+02:00 Derek C Breit <breit_ideas_at_poyntsource.com>:

>      Please be more specific.. MM?? What’s that??
>
>
>
> And what increments are we talking about..
>
>
>
> I don’t even know the name of the number I was changing, but I bet it is
> the ascending node, which is just about the only number in an elset I
> understand without direction, except date, and revolutions per day..
>
>
>
> :-))
>
>
>
> Derek
>
>
>
> PS.. Currently my next day that I could observe is tomorrow Night, but
> more likely the weekend.. Maybe Kevin will find it “accidently” (*cough*)
> and then I could hammer it into submission.. :-))
>
>
>  ------------------------------
>
> *From:* Björn Gimle [mailto:bjorn.gimle_at_gmail.com]
> *Sent:* Monday, May 12, 2014 2:38 AM
> *To:* Derek C Breit
> *Cc:* Seesat List
> *Subject:* Re: DCB Obs MAY 11th UT - DMSP F18, USA 186, USA 179r,
> Lacrosse 5, USA 129 Planar Search
>
>
>
> It's the method I usually use.
>
> A drawback is that it only compensates for time.
>
> Your obs field is far from perigee , so if apogeehas been increased (or
> decreased!) the off-zenithal passes might be outside your FOV.
>
> If the TLE is old, and the error is mainly because of drag, usually change
> the Bstar (35722-3) instead.
>
>
>
> But here it should be a maneuvre, and you might simulate it partly by
> changing MM
>
> A LARGE KH MM change can be down to -0.13 or so, which would cover up to
> TWO orbits ! That would allow you to get a feeling of possible track
> offsets.
>
>
>
> /Björn
>
>
>
> 2014-05-11 21:39 GMT+02:00 Derek C Breit via Seesat-l <seesat-l_at_satobs.org
> >:
>
>
>
>
> EQUIPMENT-
> Orion ST80 with Mogg 0.6 FR and a Mintron integrating camera. ST80 is
> piggybacked on a 12" LX200 which does the slewing and tracking. Focal
> Reducer is at max distance from detector and still capable of focus.
> FOV - 1.98 x 1.48 Degrees
> Time by IOTA-VTI GPS Time inserter (from VideoTimers)
>
> Equipment Notes - Luminance only is recorded to video.
>
> >>THIS IS THE WIDEFIELD SETUP - Watec 902H2 Ultimate w/ 50mm Camera lense
>
>
> For CLASSIFIED
>
> 35951 09 057A   8739 G 20140511034118910 26 25 1007870+113982 37
> 35951 09 057A   8739 G 20140511034122680 26 25 1006489+132652 37
>
> 28888 05 042A   8739 G 20140511040457707 26 25 1226842-243045 37 S+027 03
> 28888 05 042A   8739 G 20140511040554699 26 25 1222531+051831 37
> 28888 05 042A   8739 G 20140511040614853 26 25 1220294+262102 37
> 28888 05 042A   8739 G 20140511040639629 26 25 1215424+570196 37
> 28888 05 042A   8739 G 20140511040656330 26 25 1206179+743403 37
>
> 28385 04 034B   8739 G 20140511043714705 26 25 1438294-010591 37
> 28385 04 034B   8739 G 20140511043740632 26 25 1441402+003750 37
> 28385 04 034B   8739 G 20140511043755981 26 25 1443403+014053 37
>
> 28646 05 016A   8739 G 20140511053149215 26 25 0601122+435046 37
> 28646 05 016A   8739 G 20140511053249711 26 25 0656731+453566 37
> 28646 05 016A   8739 G 20140511053427245 26 25 0935500+394253 37
> 28646 05 016A   8739 G 20140511053451870 26 25 1025026+340126 37
> 28646 05 016A   8739 G 20140511053541922 26 25 1156480+165379 37
> 28646 05 016A   8739 G 20140511053550230 26 25 1209252+134228 37
>
>
>
>
> Obs - Pred: 0.557 deg X-track; 0.066 s early, relative 11.05 day old elset:
> Obs - Pred: 0.303 deg X-track; 0.473 s early, relative 11.05 day old elset:
>
> Obs - Pred: 0.071 deg X-track; 2.261 s early, relative 5.04 day old elset:
> Obs - Pred: 0.059 deg X-track; 2.149 s early, relative 5.05 day old elset:
> Obs - Pred: 0.056 deg X-track; 2.168 s early, relative 5.05 day old elset:
> Obs - Pred: 0.068 deg X-track; 2.180 s early, relative 5.05 day old elset:
> Obs - Pred: 0.131 deg X-track; 2.336 s early, relative 5.05 day old elset:
>
> Obs - Pred: 0.077 deg X-track; 18.916 s early, relative 7.02 day old elset:
> Obs - Pred: 0.001 deg X-track; 19.730 s early, relative 7.02 day old elset:
> Obs - Pred: 0.031 deg X-track; 21.109 s early, relative 7.02 day old elset:
>
> Obs - Pred: 0.026 deg X-track; 0.409 s early, relative 7.38 day old elset:
> Obs - Pred: 0.037 deg X-track; 0.223 s early, relative 7.38 day old elset:
> Obs - Pred: 0.065 deg X-track; 0.193 s early, relative 7.38 day old elset:
> Obs - Pred: 0.079 deg X-track; 0.023 s early, relative 7.38 day old elset:
> Obs - Pred: 0.142 deg X-track; 0.070 s late, relative 7.38 day old elset:
> Obs - Pred: 0.090 deg X-track; 0.047 s late, relative 7.38 day old elset:
>
>
> NOTES-
>
> PLANAR SEARCH FOR USA 129..
> I did *MOST* of a search for USA 129 and did not find it. Everything seen
> was matched.. (I did catch USA 179r by "accident".. Only
> the second time I have caught a classified object accidently.. Yeah!")
>
> First Planar Search I have attempted.. Using the current Classified elset,
> I edited this number.. 127.2344 in 10.0 increments.. I
> covered roughly that number plus 180 to minus 60.. 2/3's of the search..
>
> If this method is correct, then it is not in the part I covered ( 5x7 deg
> FOV to mag 8) and someone should look to the parts I
> didn't cover i.e. "Late" vs. the current elset.. If this isn't correct,
> well..
>
>
> Big Flares from USA 186.. Video forthcoming..
>
>
> Derek
>
> Derek C Breit
> BREIT IDEAS Obs - Morgan Hill, CA - COSPAR 8739
> E. Longitude -121 42 10.0, Latitude 37 6 47.8, Alt. 282m;
>
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>
>
>
> --
>
> ----------------------------------------
> Björn Gimle, COSPAR 5919
> 59.2617 N, 18.6169 E, 51 m
> Phone: +46 (0)8 571 43 312
> Mobile: +46 (0) 704 385 486
>   ------------------------------
>
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-- 
----------------------------------------
Björn Gimle, COSPAR 5919
59.2617 N, 18.6169 E, 51 m
Phone: +46 (0)8 571 43 312
Mobile: +46 (0) 704 385 486
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Received on Mon May 12 2014 - 13:55:30 UTC

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