PDS_VERSION_ID        = PDS3                                                  
RECORD_TYPE           = STREAM                                                
^TIFF_DOCUMENT        = "BETA_ANG.TIF"                                        
OBJECT                = TIFF_DOCUMENT                                         
  DOCUMENT_NAME         ="MGS BETA ANGLES"                                    
  DOCUMENT_TOPIC_TYPE   ="MISSION DESCRIPTION"                                
  PUBLICATION_DATE      = 2007-09-25                                          
  INTERCHANGE_FORMAT    = BINARY                                              
  DOCUMENT_FORMAT       = TIFF                                                
  DESCRIPTION           = "Out-of-plane (beta) angles for Earth (black)       
    and Sun (blue) measured from the Mars Global Surveyor orbit plane         
    between 1999-01-22 and 2005-08-18.  Note different scales and units       
    (left and right vertical axes).  The orbit was designed originally        
    to have the spacecraft crossing the equator at approximately 2 PM         
    local solar time; because of aerobraking delays, the final was a          
    2 AM orbit -- the difference being only the direction of the equator      
    crossing.  At Earth beta angles of 0 (for example, near MJD 51900)        
    the orbit appears edge-on to an Earth-based observer, occultations        
    are diametric, and spacecraft motion in the radial direction to/from      
    Earth is maximized.  At Earth beta angles of 90 the orbit appears         
    broadside, there are no occultations, and all of the spacecraft           
    motion is perpendicular to the Earth line.                                
                                                                              
    This figure was provided by Frank Lemoine of the NASA Goddard Space       
    Flight Center in Greenbelt, MD."                                          
END_OBJECT            = TIFF_DOCUMENT                                         
END