Updated elements of NOSS 3-4

From: Ted Molczan (ssl3molcz@rogers.com)
Date: Sun Mar 09 2008 - 00:11:19 UTC

  • Next message: Daniel Deak: "ATV is on its way !"

    New observations have been reported recently by Scott Campbell, Russell Eberst,
    Marco Langbroek, Lutz Schindler and Mike Waterman.
    
    Here are updated elements:
    
    NOSS 3-4 (A)     0.0  0.0  0.0  4.9 v
    1 31701U 07027A   08068.82413008  .00000019  00000-0  32710-4 0    06
    2 31701  63.4055  72.2223 0128530 147.4265 213.4772 13.41267455    07
    Arc 2008 Feb 13.16 - Mar 08.34, WRMS residuals = 0.032 deg
    
    NOSS 3-4 (C)     0.0  0.0  0.0  4.9 v
    1 31708U 07027C   08068.82421852  .00000018  00000-0  30000-4 0    08
    2 31708  63.4028  72.4159 0128220 146.9208 213.9919 13.41267872    02
    Arc 2008 Feb 24.42 - Mar 08.34, WRMS residuals = 0.021 deg
    
    At the epoch, C trailed A by 7.6 s at the ascending node, and the closing rate
    was nearly zero; therefore, the observed nominal separation for 3rd generation
    NOSS, about 8 s appears to have been achieved. Eventually, the pair will
    manoeuvre to synchronize their mean motion to that of the other operational NOSS
    groups, currently about 13.40515 rev/d.
    
    The NOSS 3-4 pair appear to have more or less completed their manoeuvres to
    compensate for the under-burn of the Centaur upper stage that inserted them into
    too low an orbit, during launch on 2007 June 15 UTC.
    
    Over the past 7 months, both spacecraft have made in excess of 50 corrective
    manoeuvres. Here is a plot of their manoeuvre history, expressed as the
    percentage of completion of the approximate required altitude-raising:
    
    http://www.satobs.org/seesat_ref/NOSS_3-4/NOSS_3-4_altitude_progress_3.pdf
    
    Additional information on the NOSS satellites is available here:
    
    http://www.satobs.org/noss.html
    
    Ted Molczan
    
    -------------------------------------------------------------------------
    Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive:  
    http://www.satobs.org/seesat/seesatindex.html
    



    This archive was generated by hypermail 2b29 : Sun Mar 09 2008 - 00:15:40 UTC