NAME: MVN_ORBIT_NUM function: mvn_orbit_num() PURPOSE: returns database structure that contains orbit information about each MAVEN orbit. Alternatively - Returns the time if given the orbit number or returns the orbit number if given the time. Typical CALLING SEQUENCE: orbdata = mvn_orbit_num() store_data,'orbnum',orbdata.peri_time,orbdata.num,dlimit={ytitle:'Orbit'} tplot,var_label='orbnum' TYPICAL USAGE: print, mvn_orbit_num(time=systime(1) ) ; prints current MAVEN orbit number print , time_string( mvn_orbit_num(orbnum = 6.0) ; prints the time of periapsis of orbit number 6 timebar, mvn_orbit_num( orbnum = indgen(300) ) ; plots a vertical line at periapsis for the first 300 orbits Author: Davin Larson - October, 2014 $LastChangedBy: $ $LastChangedDate: $ $LastChangedRevision: $ $URL: $