> >> 4) the "Angle format code" I use 2 because I saw a few more of you using >> it. Does it make a difference? > > No, this does not really make a difference. If you are referencing > positions with astrometry.net, use the RA/Dec formats, so either 1, 2, > 3 or 7. Andrea, As Cees indicates, any format will do, but some formats allow more precision than others, due to the fixed-column format and the ability to represent combined significant figures. My analyses of the IOD angle formats was as follows (listed as best to worst): Format Type RA/AZ DEC/EL MX units of arc RA/DEC Precision AZ/EL Precision Precision Sum Least Squares Precision (mas) X Times worse 6: AZ/EL DDDdddd DDdddd degrees 1.00E-04 1.00E-04 2.00E-04 1.41E-04 509 1.00 5: AZ/EL DDDMMmm DDMMmm minutes 1.67E-04 1.67E-04 3.33E-04 2.36E-04 849 1.67 3: RA/DEC HHMMmmm DDdddd degrees 2.50E-04 1.00E-04 3.50E-04 2.69E-04 969 1.90 2: RA/DEC HHMMmmm DDMMmm minutes 2.50E-04 1.67E-04 4.17E-04 3.00E-04 1,082 2.12 4: AZ/EL DDDMMSS DDMMSS seconds 2.78E-04 2.78E-04 5.56E-04 3.93E-04 1,414 2.78 7: RA/DEC HHMMSSs DDdddd degrees 4.17E-04 1.00E-04 5.17E-04 4.28E-04 1,543 3.03 1: RA/DEC HHMMSSs DDMMSS seconds 4.17E-04 2.78E-04 6.94E-04 5.01E-04 1,803 3.54 Also, as Marco indicated, his windows software can help you format an IOD. If you don’t easily have access to windows you can use this online dynamic form at TruSat.org <http://trusat.org/> (you can copy the resulting IOD string if you don’t want to register there) https://trusat.org/submit/single <https://trusat.org/submit/single> -Chris _at_interplanetary _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-lReceived on Fri May 22 2020 - 18:54:04 UTC
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