urn:esa:psa:bc:miscellaneous:mpo_misc_orbit_number 0.2 1.22.0.0 Product_Ancillary bc_mpo_fsp_92004_20260825_20270818_v07.orb 2026-06-18 0.1 This is version 0.1 of product Orbit date mapper 2026-06-19 0.2 This is version 0.2 of product Orbit date mapper 2026-03-20T06:21:38Z 2028-03-20T23:56:43Z Engineering Calibrated BepiColombo Mission urn:esa:psa:context:investigation:mission.bc ancillary_to_investigation Observing System for BepiColombo MPO Mercury Planetary Orbiter Host urn:esa:psa:context:instrument_host:spacecraft.mpo is_instrument_host mpo_misc_orbit_number.orb 2026-06-19T09:17:55.968557Z 297933 1635 7b279cb1832113c62de20e7494c758a5 BepiColombo MPO orbit number 363 1635 This is the BepiColombo orbit number files produced by NAIF's ORBNUM utility program. Each of the records contains the time of THAT orbit's apocenter and the time of the NEXT orbit's pericenter. For example, the line for orbit '3' provide UTC and SCLK of orbit '3' apocenter and UTC of orbit '4' pericenter. Orbit number 1 corresponds to the first science phase orbit. This is derived from the BepicColombo Space to Ground Interface Control Document - Volume: Flight Dynamics Events File (BC-ESC-IF-50002): "Orbit numbers are incremented by one with each apocentre passage starting from the first apocentre after orbit insertion."" All derived quantities provided on each record -- sub-solar lon/lat, sub-spacecraft lon/lat/alt, and orbital elements -- are computed for the time of apocenter. Line-Feed 15 0 182 orbit_number 1 1 ASCII_NonNegative_Integer 5 Orbit number apocentre_time_utc 2 8 ASCII_Date_Time_YMD_UTC 20 UTC time of apocentre apocentre_time_sclk 3 30 ASCII_String 20 S/C clock at apocentre time: P/SSSSSSSSSS:FFFFF, P: Partition of the S/C clock, SSSSSSSSSS: Relative seconds after T0, FFFFF: Fractional non decimal seconds running until 65535 pericentre_time_utc 4 52 ASCII_Date_Time_YMD_UTC 20 UTC time of pericentre solar_longitude 5 74 ASCII_Real 7 deg SolLon solar_latitude 6 83 ASCII_Real 7 deg SolLon spacecraft_longitude 7 92 ASCII_Real 7 deg SolLon spacecraft_latitude 8 101 ASCII_Real 7 deg SolLon altitude 9 110 ASCII_Real 10 km altitude inclination 10 122 ASCII_Real 7 km inclination eccentricity 11 131 ASCII_Real 6 km eccentricity longitude_ascending_node 12 139 ASCII_Real 7 deg longitude_ascending_node argument_perihelion 13 148 ASCII_Real 7 deg longitude_ascending_node solar_distance 14 157 ASCII_Real 12 deg solar_distance semimajor_axis 15 171 ASCII_Real 11 deg semimajor_axis