Hello Gonzalo, Congrats with your 1st IOD observation. A nice result. Greetings Leo Op di 12 mei 2020 om 00:54 schreef Gonzalo Blasco <gblasco_at_gmail.com>: > Hello all, > > TAKE CARE THEY ARE MY FIRST IOD REPORT EVER!!! > Any comments will be appreciated... > > Last afternoon I checked in Heavens Above that i will have a very near > pass of a (decaying) Starlink satellite 1086 - Starlink 2-BD - 2020-001-BD > - 44965. > > MY OBSERVATIONS: > > 44965 20 001BD 9999 P 20200511015129800 57 75 1026017+217830 85 > 44965 20 001BD 9999 P 20200511015127600 57 75 1018442+195860 85 > > OBSERVATORY DATA: > > NAME: ZAPOPAN TINACO > 20.75439N -103.37516W alt 1570meters > > (I have more photos in the same pass, but I want to check before if they > are useful to send them because if I take more time they will be probably > outdated... if they are not already ) :-( > > ==================================== > A LITTLE ABOUT THE EXPERIENCE > ==================================== > > As I told, I checked in heavens above and It would have a MAX height of > 84degrees and a distance of 286km (I think this is quite near) > > https://photos.app.goo.gl/zSGgZR1o8FyjZCWF9 > > Then I checked in CALSKY and it seems a decaying satellite, so I found the > orbit observation COULD be interesting.... Probably if i made the > calculations before :-( . Im too slow processing the data yet. > > ==================================== > ABOUT THE SAT > ==================================== > Name: Starlink 2-BD > Also named: Starlink 1087 > *Decays: 12 May 2020 22:23 UTC (predicted)* > Brightness: 6.5 mag (at 1000 km, 50% illuminated) > 3.1 mag (at perigee, full illumination) > USSPACECOM Nr: 44965 Internat. Designator: 2020-001BD > ==================================== > > I had clouds.... so it was quite difficult to see anything, and my sky was > still blue (the sun was at -7degrees) so I setup the camera and make a > series of 2 second photos and wait what happen. > > At naked eye I didn't see anything, but after downloading the photos, I > watched the trails in about 6 photos, and about 1 minute after the > predicted time of heavens-above....(quite long difference) > > I checked that the CALSKY calculations was based in *very** recent TLE of > SATEVO, *so I checked them, and They were more accurate with my > observation.... and the difference was about one or two second.... > > The good luck of my photo is that the sat was passing at 1 degree left of > ALGIEBA (41 LEO), but passed clearly at the right. It was a clear > difference!! > > ==================================== > ABOUT THE TIME UNCERTAINTY > ==================================== > > I did some experiments in recent days, and I was quite to know at least to > see if the capture was made in the early part of the second or in the last > part... so it was better than a +-1sec uncertainty . I am about +-0.5sec > uncertainty. Also i made some experiments about the sync of the camera, and > was quite good with less than 0.2secs I think... so I guess that +/- 0.6 > secs is a nice guess for this one. > > END (EXIF) > 2020 05 11 - 01:51:30.2 UTC -0.43OFFSET > EXPOSURE: 2.19sec > > > START: 01:51:27.6 > END: 01:51:29.8 > > Uncertainty +-0.5 > > ==================================== > ABOUT THE POSITION UNCERTAINTY > ==================================== > I used ASTROREC following the Marco Langroek PDF written 22 May 2016 > > Of, I had VERY few stars (about 8) , but I had made previous experiments > with another well predicted satellites, and the uncertainty of the > medition could be with a std deviation of about 40-50 arcsecs in this case, > and about 20-40 with more reference stars..... > > Then I plot the points of the medition / measurement in Aladin over a DSS > photo and I measured if the trail was in the correct position like in the > photo. And all seem fine!!! > > I have not the right tools, so its a bit difficult, and was poor > observations, but I think I could be doing better next time.... > > After watching the results against a chart of CALSKY, the time difference > was below 1sec, and the satellite passed about 50minutes at the predicted > position. > > The total trail during the 2.19sec exposure was of 2.75degrees > > ==================================== > THE LAST ONE OR TWO ARE MY BEST MEASURMENTS WITH ASTROREC > ==================================== > "44965 " 2020 05 11 01 51 30 0.0 27.83 0.03 154.684 19.586 156.503 > 21.788 0.019 0 "IMG_8905" "ZAP BOSQ TINACO " > "44965 " 2020 05 11 01 51 30 0.0 27.83 0.03 154.684 19.586 156.503 > 21.788 0.019 0 "IMG_8905" "ZAP BOSQ TINACO " > "44965 " 2020 05 11 1 51 30 0.0 27.83 0.02 154.682 19.591 156.509 > 21.787 0.012 100 "IMG_8905" "ZAP BOSQ TINACO " > "44965 " 2020 05 11 1 51 30 0.0 27.81 0.02 154.684 19.586 156.507 > 21.783 0.012 100 "IMG_8905" "ZAP BOSQ TINACO " > > ==================================== > ABOUT ALL THE PROCESS > ==================================== > > I made screen captures of all the process, so if you want to check all the > measures over and the photos... you can access my captures here: > > https://photos.app.goo.gl/GWkZf56uZgaUwfoq7 > > I want to thank Marco Lanbroek and Jonathan McDowell for all the > inspiration > > and specially for all you guys who have helped me with my questions: Leo > Barhorst, Charles Phillips and Brad Young > > Thank you, > > -- > Gonzalo Blasco Gil > _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-lReceived on Tue May 12 2020 - 00:02:52 UTC
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