David Brierley's observations of 2007 Apr 10-11 UTC have further improved the orbits. Since my last report, further analysis of the 06037A and 07005B orbits has led me to swap their identities, which is reflected in the following elements. I alerted observers off-list, but due to a lack of clarity on my part, David Brierley ended up using the old IDs, despite trying to comply. I apologize to David and any one else who I confused. Here are David's 06037A and 07005B obs from last night, with the corrected IDs: 0700502267507041100283311 010 12235688 +55520 10 5 0700502267507041100285875 010 12003531 +53244 20 5 +34 S 0700502267507041100292302 010 12010135 +50556 15 5 0603701267507041100504782 010 12021834 +61238 20 5 +43 S 0603701267507041100510600 010 12022846 +57453 20 5 0603701267507041100513637 010 12023871 +52486 20 5 Standard magnitudes below, where stated, are those of the corresponding 03009 objects. IGS-O2 0.0 0.0 0.0 5.7 v 1 29393U 06037A 07101.02418253 .00001407 00000-0 54885-4 0 05 2 29393 97.3689 221.4360 0002062 113.8685 246.2770 15.25972903 01 Arc 2007 Apr 05.00 - 11.04, WRMS residuals = 0.009 deg The radar was 3 to 4 s late, which suggests that it may have manoeuvred. I guessed at the new mean motion, based on experience with the 03009 satellites, and adjusted only RAAN and mean anomaly, to arrive at estimated elements: IGS-R2 0.0 0.0 0.0 3.3 v 1 30586U 07005A 07101.05083736 .00001410 00000-0 55100-4 0 09 2 30586 97.3219 221.8551 0004813 141.6421 218.5161 15.25900000 00 From 2 points on 2007 Apr 11 at 01:29 UTC The fit has poor time residuals of about +0.5 and -0.6 s, but further tracking will sort things out. I fixed the inclination of 07005B at 97.32 deg, pending further obs: IGS-OVS 1 30587U 07005B 07101.00857400 .00001984 00000-0 77221-4 0 06 2 30587 97.3200 221.8264 0003137 348.7255 11.3913 15.26041030 09 Arc 2007 Apr 07.02 - 11.02, WRMS residuals = 0.013 deg IGS-R2 r 0.0 0.0 0.0 3.6 v 1 30588U 07005C 07101.05603243 .00004379 00000-0 86470-4 0 03 2 30588 97.2757 222.7068 0095497 319.0692 40.3412 15.42208579 01 Arc 2007 Apr 04.97 - 11.07, WRMS residuals = 0.017 deg IGS-R2 adapter 0.0 0.0 0.0 4.4 v 1 30589U 07005D 07101.04406750 .00002989 00000-0 11196-3 0 04 2 30589 97.2219 221.5757 0008639 214.5597 145.5082 15.27278777 03 Arc 2007 Apr 04.96 - 11.06, WRMS residuals = 0.009 deg The elements of E and F are based on few obs, so there remains some uncertainty in the elements, mainly in eccentricity and argument of perigee. IGS-R1 shroud1 0.0 0.0 0.0 4.0 v 1 30590U 07005E 07101.04866113 .00007770 00000-0 29067-3 0 08 2 30590 97.2200 221.5288 0008427 260.3166 99.7122 15.27326293 02 Arc 2007 Apr 04.96 - 11.06, WRMS residuals = 0.024 deg IGS-R2 shroud2 0.0 0.0 0.0 4.0 v 1 30591U 07005F 07101.05026761 .00005929 00000-0 22208-3 0 01 2 30591 97.2200 221.5943 0008427 252.3257 107.7063 15.27282175 07 Arc 2007 Apr 07.98 - 11.06, WRMS residuals = 0.010 deg Ted Molczan ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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