urn:nasa:pds:mess-rs-raw:calib:mess_rs_2012001_2014231_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_2012001_2014231_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. 2012-01-01T00:00:00.000Z 2014-08-19T00:00:00.000Z 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_2012001_2014231_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_2012001_2014231_ltf.tab 2020-10-16T21:27:00 237964 a201e60480dc13b41c86d3e8bf4a744f

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 2886 The table provides an estimate of the one-way light time between the MESSENGER spacecraft and a Deep Space Communications Complex (DSCC), which is several antennas in close proximity. Light times are provided for both uplink (DSCC to spacecraft) and downlink (spacecraft to DSCC). 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 %10.3f 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 or DSCC. Upleg Time 5 45 ASCII_Real 10 %10.3f second The time-of-flight for a photon arriving at the spacecraft from the DSCC at the date and time given in fields 1-3. DSS 6 57 ASCII_Integer 2 %2d The DSCC identifying number associated with the light time estimates. Complexes have numbers 10, 40, and 60. 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.