Updated NOSS 1-7 (E) elements

From: Ted Molczan via Seesat-l <seesat-l_at_satobs.org>
Date: Sun, 12 Apr 2015 13:29:22 -0400
Kevin Fetter observed 86014E / 16624 last night as an UNID. His reduced data are here:


Here are approximate elements, derived from Mike McCants' epoch 15015.09252271 TLE:

NOSS 1-7 (E)                                            468 X 1717 km
1 16624U 86014E   15102.02229136  .00006972  00000-0  12650-2 0    05
2 16624  63.3350 114.5348 0836501  42.4963 323.7809 13.44196453    00
Arc 20150412.03-0412.03 WRMS resid 0.126 totl 0.039 xtrk

Procedure used was to reduce the time residual of the observations to nearly zero, by trial and error adjustment of the
rate of decay of the epoch 15015.09252271 TLE. Next, I propagated the mean elements to the time of the latest
observation, and reduced perigee distance ~4.8 km, to account for the perturbation of the Earth's odd zonal harmonics on
the eccentricity of orbits near 63.4 deg inclination, which is not modelled by SGP4 (this reduces perigee height ~20
km/y for this object). Finally, I differentially corrected only mean anomaly and RAAN.

I did not base the analysis on Mike's epoch 15048.73336422 TLE, because its mean motion seemed a bit too high, and I
could not find the supporting observation(s).

Ted Molczan

Seesat-l mailing list
Received on Sun Apr 12 2015 - 12:30:06 UTC

This archive was generated by hypermail 2.3.0 : Sun Apr 12 2015 - 17:30:06 UTC