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Lars_J
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« Reply #15 on: 12/13/2010 04:18 AM » |
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I have a very similar bar chart, AnalogMan.
The first plot is fascinating. They are mostly to the East, and preferentially to the North. That's probably because the way the orbital track is lined up for deorbits. (going from south-west to north-east). This would seem to imply that most Soyuz landings overshoot their target.
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anik
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« Reply #16 on: 12/14/2010 08:45 PM » |
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The map shows the TMA-16 landing "pin" in or on a 3-5 km lake, but TM-23 landing marked in a field. Soyuz 23 was the one that landed in Lake Tengiz, but I see no pin on a lake marked Tengiz in Cyrillic in Google Maps. Am I mistaken? Soyuz-23 and Soyuz TM-23 are different spacecrafts. I noticed something odd in the data. Until TM-27, all data is in integral units of minutes of latitude and longitude. After that, the "planned" remain rounded but the "actuals" are usually in integral units of seconds of latitude and longitude Planned coordinates are always given in rounded minutes. Actual coordinates can be rounded to minutes or have seconds - it depends on equipment used for determination of coordinates. Now we are using GPS data for determination so coordinates have seconds.
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Comga
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« Reply #17 on: 01/26/2011 10:34 PM » |
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Soyuz-23 and Soyuz TM-23 are different spacecrafts.
My mistake. Target coordinates before TM-12, and either target or actual for most of the predeceding landings, are not available? Thanks again. This is great information.
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anik
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« Reply #18 on: 01/28/2011 09:17 AM » |
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Target coordinates before TM-12, and either target or actual for most of the predeceding landings, are not available? Yes, all what I know is in the file.
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simonbp
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« Reply #19 on: 01/28/2011 06:56 PM » |
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Comga
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« Reply #20 on: 03/16/2011 08:43 PM » |
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How does the precision of today's landing of TMA-M compare to previous flights?
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anik
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« Reply #21 on: 03/19/2011 10:22 AM » |
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Soyuz TMA-M:
Planned point specified after undocking - 51°01' N, 67°13' E; 88 km N of Arkalyk.
Actual point - 51°02'54" N, 67°17'36" E; 93 km N of Arkalyk.
Overshoot - 6 km NE.
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patchfree
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« Reply #22 on: 03/19/2011 01:59 PM » |
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Soyuz TMA-M:
Planned point specified after undocking - 51°01' N, 67°13' E; 88 km N of Arkalyk.
Actual point - 51°02'54" N, 67°17'36" E; 93 km N of Arkalyk.
Overshoot - 6 km NE.
Can this overshoot be explained by the high winds during the parachute phase or by the precision limits of the spacecraft guidance during the "gliding" phase?
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AnalogMan
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« Reply #23 on: 03/19/2011 02:03 PM » |
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Soyuz TMA-M:
Planned point specified after undocking - 51°01' N, 67°13' E; 88 km N of Arkalyk.
Actual point - 51°02'54" N, 67°17'36" E; 93 km N of Arkalyk.
Overshoot - 6 km NE.
I updated my scatter graph with this latest data point (marked in red) - click to enlarge.
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Comga
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« Reply #24 on: 05/24/2011 05:41 AM » |
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Waiting for today's landing to be added to the database...
Looked really close to the ground observers, with little wind
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Comga
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« Reply #25 on: 06/23/2011 02:51 PM » |
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Waiting for today's landing to be added to the database...
Looked really close to the ground observers, with little wind
Bump Are the target and actual coordinates available?
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anik
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« Reply #26 on: 06/23/2011 05:15 PM » |
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Are the target and actual coordinates available? 47°19' N, 69°35' E 47°21'57.84" N, 69°27'49.26" E
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AnalogMan
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« Reply #27 on: 06/26/2011 10:38 AM » |
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Are the target and actual coordinates available?
47°19' N, 69°35' E
47°21'57.84" N, 69°27'49.26" E
Updated my scatter graph with this latest data point for TMA-20 (marked in red) - click to enlarge.
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NotGncDude
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« Reply #28 on: 06/26/2011 08:34 PM » |
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If I weren't so lazy I'd love to do a downrange-crossrange dispersion aligned with the ground track. You should expect to see much smaller crossrange error... should.
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Comga
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« Reply #29 on: 06/29/2011 08:31 PM » |
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Are the target and actual coordinates available?
47°19' N, 69°35' E
47°21'57.84" N, 69°27'49.26" E
Thanks! I get a 9.8 km offset of actual from target. This is right around the median of all previous flights, although it lies in the otherwise unoccupied North-West quandrant of AnalogMan's graph. Was it unreasonable to expect the new digital control system to reduce the distance?
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