Hi all, I noted that the orbital parameters given in this DPRK announcement here: https://soundcloud.com/martyn-williams-6/voice-of-korea-on-kwangmyongsong-4-launch ...namely perigee 494.6 km, apogee 500 km, inclination 97.4 deg is inconsistent with what we so far have from US tracking of the object. The first few sets of orbital elements published by JSpOC on Space-Track give (calculated from eccentricity and Mean Motion values) these values: - perigee 465 km, apogee 502 km, inclination 97.5 deg There is a clear difference in the apogee altitude here: 465 km according to JSpOC, 494.6 km according to the DPRK. Now, this could be due to initial inaccuracies in the JSpOC tracking data. The first few elsets always have some variation and are less accurate usually. Yet given the magnitude of the difference, I doubt this a bit. Instead, and assuming that the values in the DPRK announcement are not based on actual North Korean tracking but represent a pre-launch desired orbit, I wonder if this is perhaps an indication that the satellite ended up in an orbit with lower perigee than intended? - Marco ----- Dr Marco Langbroek - SatTrackCam Leiden, the Netherlands. e-mail: sattrackcam_at_langbroek.org Station (b)log: http://sattrackcam.blogspot.com Twitter: _at_Marco_Langbroek PGP key: http://tinyurl.com/kur7xm8 ----- _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-lReceived on Sun Feb 07 2016 - 12:12:08 UTC
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