Hey everyone, during corona time, being alone under a stary night on a field somewhere remote is really nice and still possible under the not soo cool situation we are all in. So I hope you are all still fine, too! I am currently preparing the next step of my GoPro tests[0] with the feedback I got for my previous email to this list[1], thank you. I hav some Starlink observations and extracted the RA/DEC/Time from it. Now I am putting everything to the IOD format, so I can send it to this list. I have some questions and it would be really nice if you could answer them to me. So all questions will concern the observations from the following google spreadsheet, so you can see what I did. https://docs.google.com/spreadsheets/d/1ff7gv4m9l9Xxb7lhevPBsfaqN8r5bpFuWs_-Dyx9rgo/edit?usp=sharing Thank you in advance! 1) What is a good way to fill the "Object number and international designation" when you do not know the satellite that you observed? 2) Is there a way to quantify the "Sky condition codes", because maybe my poor will your bad condition. 3) What does "Time uncertainty" mean? This is one of te more interesting questions for me, because I have a few time uncertainties in a range of seconds. The GPS of the gopro is only used by the second, not sub second. So +-0.5sec could be possible. The storing itself seems to variying. I set the integration time to 10 seconds and that I can see n the data, but the time gaps between the photos seems to jitter between 2 and 4 seconds. So I would use MX = 18: 1*10E(8-8) = 1 sec but I am not sure. For what will this be important? 4) the "Angle format code" I use 2 because I saw a few more of you using it. Does it make a difference? 5) Is the "Epoch code" related to J2000? 6) I am not sure yet how precise my way in determinatig the RA/DEC is, so I used MX = 56: 5*10E(6-8) = 0.05 deg/min/sec of arc as the "Positional uncertainty", good idea? 7) Where do I find an explanation of how I can determine the "Optical behavior code"? As before, I would like to able to help, but I don't know how to rate that. This is also for the related code sthat follow. 8) And last but not least, the "Flash period in seconds". Is that from the observed satellite? I try to find some examples on http://www.satobs.org/ but I would like to compare what I understood with some sample to be sure. I know these are a few questions, but I really wouuld like to understand better how to create the IOD better. So I hope I will hear from some of you here. As soon as I get a better feeling of this, I will also try to determinate the orbit parameters of my observations. Best regards, Andreas [0] https://aerospaceresearch.net/?page_id=1874 [1] [Astrometry] [HowTo] Attitude determination of GoPro camera with Nova.Astrometry.net to finally track satellites whooshing by in the photos. Starlink Edition (feedback welcome) _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-lReceived on Fri May 22 2020 - 13:49:58 UTC
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