Re: LaCrosse 4 Flare

From: Bjoern Gimle@GlocalNet (Gimle@GlocalNet)
Date: Wed May 28 2008 - 18:48:54 UTC

  • Next message: oben@sonnenkinder.org: "ISS in Civil Twilight"

    Rob's SkyMap and most planetarium programs give
    
                 Date/Time: 2008/ 5/25  3:15:17 UTC
     Sun      4h  9m 14.55s  +21  0'  1.3"   1.012943  31'34.7"
    
    SkyMap (on keypress "t" in the map) and other predictions programs
    give phase and range, but with the Sun's (RA,Dec) and your satellite 
    positions (RA1,Dec1) in decimal degrees the angle can also be computed:
    
    =DEGREES(acos(SIN(Dec*PI()/180)*SIN(Dec1*PI()/180)+COS(Dec*PI()/180)*COS(Dec1*PI()/180)*COS((RA-RA1)*PI()/180)))
    
    I have a spreadsheet that computes the phase directly from the Sun's
    hexagesimal coordinates, and the IOD formatted strings.
    (acos is defined in a VBA macro using ATAN2 and sin=sqrt(1 -cos^2))
    
    (I get 102.508 and 94.345, SkyMap shows 102.6 and 94.1)
    
    
    ----- Original Message ----- 
    26473 00 047A 8336 B 20080525031517340 17 25 1341631+491146 78 M
    26473 00 047A 8336 B 20080525031555530 17 25 1518611+640506 98 N
    
    I do not have the tools to calculate what the phase angle or range was at 
    the timing noted - I'm sure others can do this.
    TULSA1:
    COSPAR 8336 +36.1397, -95.9838, 201 m
    
    
    -------------------------------------------------------------------------
    Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive:  
    http://www.satobs.org/seesat/seesatindex.html
    



    This archive was generated by hypermail 2b29 : Wed May 28 2008 - 18:49:56 UTC