urn:nasa:pds:mess-rs-raw:calib:mess_rs_2012046_2012053_ltf 1.0 1.14.0.0 Product_Ancillary Simpson, R. A. 2020 MESSENGER Light Time File, migrated from original PDS3 archive 2020-10-16 1.0 These data have been migrated from PDS3 PRODUCT_ID MESS_RS_2012046_2012053_LTF in data set MESS-V/H-RSS-1-EDR-RAWDATA-V1.0 to PDS4. The data file has not been changed; a new PDS4 label was created as part of the migration process. 2012-02-15T20:00:00.000Z 2012-02-22T20:55:00.000Z MESSENGER Mission urn:nasa:pds:context:investigation:mission.messenger ancillary_to_investigation urn:nasa:pds:messenger:document-rs:sis-ltf ancillary_to_document MESS-V/H-RSS-1-EDR-RAWDATA-V1.0:MESS_RS_2012046_2012053_LTF data_to_derived_source_product PDS Geosciences Node The value of external_source_product_identifier is constructed from the PDS3 DATA_SET_ID, an ASCII colon character, and the PDS3 PRODUCT_ID. mess_rs_2012046_2012053_ltf.tab 2020-10-16T21:27:49 3325920 5e0bed0d7f335e6baf71fdb833c3c5c7

LTF Header 0 1230 7-Bit ASCII Text Fifteen lines with identifying information provided by the organization that generated the LTF

Light Time Table 1230 40544 The table provides an estimate of the one-way light time between the MESSENGER spacecraft and an antenna of the NASA Deep Space Network (DSN) Light times are provided for both uplink (DSN antenna to spacecraft) and downlink (spacecraft to DSN antenna). Carriage-Return Line-Feed 7 0 82 Year 1 1 ASCII_Integer 2 %2d Two-digit year of the light time estimates at the spacecraft. Add 2000 to this value to obtain the four-digit year. Day of Year 2 4 ASCII_Integer 3 %3d Three-digit day of year of the light time estimates at the spacecraft, counting from 001 on 1 January. Time 3 8 ASCII_Time 8 %8s Time of the light time estimates at the spacecraft in the format hh:mm:ss. Downleg Time 4 30 ASCII_Real 10 %10.6f second The time of flight for a photon leaving the spacecraft at the date and time given in fields 1-3 to reach the DSN antenna. Upleg Time 5 45 ASCII_Real 10 %10.6f second The time-of-flight for a photon arriving at the spacecraft from the DSN antenna at the date and time given in fields 1-3. DSS 6 57 ASCII_Integer 2 %2d The DSN antenna identifying number associated with the light time estimates. Antennas have numbers like 15, 43, and 65. RSN 7 73 ASCII_Integer 8 %8d Record sequence number -- the number of the record within the file starting from '1' for the first record in the Header.