Re: Astra christmas dance and Re: NEOS

From: Björn Gimle (b_gimle@algonet.se)
Date: Mon Dec 27 2004 - 16:07:18 EST

  • Next message: Steve Newcomb: "8539 obs dec 27"

    Since the FOV is small (31'x23') I used a flat approximation of celestial
    coordinates, and had Solver find the best scale and rotation to fit the
    stars
    below, whose positions I measured in my double-size copy as:
    (1107,190) ( 467,101) ( 542,400) ( 953,490) ( 775,828)
    Result : Upper left corner at 04:10:00,-7.2295 (20:48:39)
    Scale 143721 pixels/radian (41.8/arcmin) RMS=4.5 pixels in star positions.
    
    Sat pos:
    94854 04 854C   9986 G 20041219204839000 57 25 0408724-072298 17 S
    94854 04 854C   9986 G 20041219205146000 17 25 0411801-073513 17 S
    (Used 9986 +53.2325    3.053  0     Wirral,UK,John Locker in ObsEntry sites)
    Orbit by FIRST.EXE:
    04-854C
    1 94854U 04854C   04354.37799614  .00001200  00000-0  24000-3 0    02
    2 94854  13.7795 240.7038 0000010   0.0000   0.0000  1.01798609    00
    ELCOR adjusts it to:
    04-854E                         2.9              35366 x 35366
    1 94854U 04854E   04354.37799614  .00001200  00000-0  24000-3 0    08
    2 94854  13.8163 240.8721 0000010   0.0000 359.9350  1.01789465    04
    
    /Björn
    
    ----- Original Message ----- 
    From: "satcom"
    >
    > Thanks for the update.
    >
    > Interestingly you have identified the most eastern bird as Astra 1B ,
    which
    > confirms my suspicions that  this craft has a problem.It is well outside
    the
    > ITU control box and brighter than the rest . In addition , a few weeks ago
    > all programming was transferred from this bird to other sats in the group.
    >
    > ----- Original Message ----- 
    > From: "Björn Gimle"
    > To: "satcom"
    >
    > > Thanks for setting me straight!
    > > That made it easy to identify the stars at 20:48:39 as
    > > 04:08:30 -07:28:52 near SkyMap's cursor
    > > 04:09:23 -07:20:31 top left
    > > 04:09:29 -07:27:42 further down...
    > > 04:08:55 -07:33:57
    > > 04:09:25 -07:38:38 low left.
    > > And the satellite to the left is 91-15A
    > > the others 96-21A, 93-31A, 99-33A, 97-76A, 95-55A
    > >
    > > If I only had a reliable program to reduce positions... I may try the
    > > Solver in Excel
    
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