[Isocops] Sun-Pointing Manuever

[Nathan Schwadron]

Hi All

Sun-pointing Success! 

Looking at the latest goatherder, the Sun Pointing Manuever on 2011/08:13:23:47:21 went off well. The pointing achieved is:


            J2000            Spin Axis

            ECI X=                  -0.764152

            ECI Y=                  0.586385

            ECI Z=                  0.268747

  

That means that at the time of the maneuever, we were 1.2 deg off of the Sun:

> [nathanas at ibexsoc ~]$ ibex_rotate -o -u -0.764152,0.586385,0.268747 -w ibex-sun -t 2011/08:13:23:47:21
> 
> Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
> 
>  points axis  +1.000000,+0.000000,+0.000000
> 
>  towards ECI  -0.764152,+0.586385,+0.268747
> 
>  which is     R.A. +142.499 Decl. +15.590
> 
>  missing      R.A. +143.133 Decl. +14.572 (ibex_sun)
> 
>  error is     R.A.   +0.634 Decl.  +1.018
> 
>  for a total  1.188 deg
> 
 

The next maneuver will occur on  2011/08:18:06:57:12 at which time we will be about 5.08 deg off from the Sun. 

> [nathanas at ibexsoc ~]$ ibex_rotate -o -u -0.764152,0.586385,0.268747 -w ibex-sun -t 2011/08:14:06:57:12
> 
>  
> 
> Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
> 
>  points axis  +1.000000,+0.000000,+0.000000
> 
>  towards ECI  -0.764152,+0.586385,+0.268747
> 
>  which is     R.A. +142.499 Decl. +15.590
> 
>  missing      R.A. +143.388 Decl. +14.504 (ibex_sun)
> 
>  error is     R.A.   +0.890 Decl.  +1.086
> 
>  for a total  1.385 deg
> 
>  
> 
>  
> 
> [nathanas at ibexsoc ~]$ ibex_rotate -o -u -0.764152,0.586385,0.268747 -w ibex-sun -t 2011/08:18:06:57:12
> 
> Quaternion    +0.000000,+0.000000,+0.000000,+0.000000
> 
>  points axis  +1.000000,+0.000000,+0.000000
> 
>  towards ECI  -0.764152,+0.586385,+0.268747
> 
>  which is     R.A. +142.499 Decl. +15.590
> 
>  missing      R.A. +147.136 Decl. +13.211 (ibex_sun)
> 
>  error is     R.A.   +4.638 Decl.  +2.379
> 
>  for a total  5.083 deg
> 
 

GO IBEX !

Nathan


Nathan Schwadron
n.schwadron at unh.edu

University of New Hampshire
Morse Hall - Room 353
8 College Road
Durham NH 03824
USA

(603) 862-3451



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