urn:nasa:pds:clementine1_bistatic:geometry:bsrgeom 1.0 1.21.0.0 Product_Observational 2024-04-26 1.0 Product migrated to PDS4 from PDS3. Deep Space Program Science Experiment Mission urn:nasa:pds:context:investigation:mission.deep_space_program_science_experiment data_to_investigation Clementine 1 Clementine 1 Host urn:nasa:pds:context:instrument_host:spacecraft.clem1 is_instrument_host Radio Science Subsystem Instrument urn:nasa:pds:context:instrument:clem1.rss is_instrument Moon Satellite urn:nasa:pds:context:target:satellite.earth.moon data_to_target bsrgeom.tab 1999-11-22T18:43:00 BSR GEOMETRY ORBIT 234 0 6719 Table gives observing geometry during Orbit 234 of the Clementine bistatic radar experiment. Table values allow reconstruction of bistatic observing geometry, including calculation of Doppler offsets, during times when anomalous backscatter from the South Pole was most likely. There are 25 columns providing: Earth receive time (ERT) transmit time (ERT minus one-way light time) lunar fixed-body x, y, and z vectors vector to the spacecraft vector to the DSN receiving station vector to the beta=0 point (backscatter point) or vector to raypath closest approach point when beta=0 was not on Moon vector to the specular point vector to the lunar South Pole latitude/longitude of beta=0 (or raypath C/A) and specular points incidence and scattering angles at all three points bistatic angle at the South Pole Beta=0 is the point on the lunar surface where bistatic backscatter would be observed. If a photon were radiated by the spacecraft and scattered by the surface, its incoming and outgoing paths would be identical at the beta=0 point. As the spacecraft moved in its orbit, the beta=0 point traced a path along the surface until it reached the limb. As seen from Earth, the spacecraft would appear silhouetted against the lunar disk until reaching the limb. The beta=0 point becomes undefined beyond the limb, but the ray passing above the limb has a closest approach point which is of interest for occultation studies. Coordinate frames used are selenocentric J2000 and lunar fixed body (rotating). Assumption made include: (1) Moon is a sphere with radius 1737.4 km; (2) speed of light is 299792458. m/s; (3) receiving station was DSS 14 at Goldstone, CA. This is an ASCII table. Columns and items are delimited by commas (vectors are considered to be single columns comprising three 'items'). Data and delimiters occupy the first 596 bytes of each row; rows are delimited by an ASCII carriage-return line-feed pair in positions 597 and 598. Carriage-Return Line-Feed 13 12 598 TRX 1 1 ASCII_Integer 5 second Earth received time (UTC) for which the geometrical calculations were made. TTX 2 7 ASCII_Real 12 second Transmit time corresponding to TRX. The one-way light time for a photon traveling directly from the spacecraft to the DSN station has been subtracted from TRX. 1 3 2 0 North Pole unit vector in J2000 coordinates. 20 30 NPOLE 1 1 ASCII_Real 9 [UNUSED] 2 10 ASCII_String 1 Field added during migration from PDS3 to accommodate inter-field bytes. These bytes are not documented in the PDS3 label. 2 3 2 0 Fixed body lunar x-axis unit vector in J2000 coordinates. 50 30 FBODX 1 1 ASCII_Real 9 [UNUSED] 2 10 ASCII_String 1 Field added during migration from PDS3 to accommodate inter-field bytes. These bytes are not documented in the PDS3 label. 3 3 2 0 Fixed body lunar y-axis unit vector in J2000 coordinates. 80 30 FBODY 1 1 ASCII_Real 9 [UNUSED] 2 10 ASCII_String 1 Field added during migration from PDS3 to accommodate inter-field bytes. These bytes are not documented in the PDS3 label. 4 3 2 0 Center of Moon to DSS 14 vector at TRX in J2000 coordinates. 110 42 DOD 1 1 ASCII_Real 13 meter [UNUSED] 2 14 ASCII_String 1 Field added during migration from PDS3 to accommodate inter-field bytes. These bytes are not documented in the PDS3 label. 5 3 2 0 Center of Moon to spacecraft vector at TTX in J2000 coordinates. 152 42 DOS 1 1 ASCII_Real 13 meter [UNUSED] 2 14 ASCII_String 1 Field added during migration from PDS3 to accommodate inter-field bytes. These bytes are not documented in the PDS3 label. 6 3 2 0 Spacecraft (TTX) to DSS 14 (TRX) vector in J2000 coordinates. 194 42 DSD 1 1 ASCII_Real 13 meter [UNUSED] 2 14 ASCII_String 1 Field added during migration from PDS3 to accommodate inter-field bytes. These bytes are not documented in the PDS3 label. 7 3 2 0 Center of Moon to South Pole vector in J2000 coordinates. 236 42 DOT 1 1 ASCII_Real 13 meter [UNUSED] 2 14 ASCII_String 1 Field added during migration from PDS3 to accommodate inter-field bytes. These bytes are not documented in the PDS3 label. 8 3 2 0 South Pole (TTX) to DSS 14 (TRX) vector in J2000 coordinates. 278 42 DTD 1 1 ASCII_Real 13 meter [UNUSED] 2 14 ASCII_String 1 Field added during migration from PDS3 to accommodate inter-field bytes. These bytes are not documented in the PDS3 label. 9 3 2 0 South Pole to spacecraft vector at TTX in J2000 coordinates. 320 42 DTS 1 1 ASCII_Real 13 meter [UNUSED] 2 14 ASCII_String 1 Field added during migration from PDS3 to accommodate inter-field bytes. These bytes are not documented in the PDS3 label. THTI 3 362 ASCII_Real 9 radian Incidence angle at South Pole. Values larger than pi/2 mean the spacecraft is below the horizon at the Pole. THTS 4 372 ASCII_Real 9 radian Scattering angle at South Pole. Values larger than pi/2 mean that DSS 14 is below the horizon at the Pole. BETA 5 382 ASCII_Real 9 radian Bistatic angle at South Pole. Separation angle between DSS 14 and the spacecraft as seen at the Pole. 10 3 2 0 Center of Moon to beta=0 (backscatter) point in J2000 coordinates. If the beta=0 point does not exist, this vector is undefined and BLAT and BLON should be set to -9.999999. 392 42 DOB 1 1 ASCII_Real 13 meter [UNUSED] 2 14 ASCII_String 1 Field added during migration from PDS3 to accommodate inter-field bytes. These bytes are not documented in the PDS3 label. BLAT 6 434 ASCII_Real 9 radian Selenocentric latitude of beta=0 point. Set to -9.999999 if the point does not exist. -9.999999 BLON 7 444 ASCII_Real 9 radian Selenocentric east longitude of beta=0 point. Set to -9.999999 if the point does not exist. -9.999999 11 3 2 0 Center of Moon to raypath closest approach in J2000 coordinates. If the beta=0 point does not exist, this vector is undefined and BLAT and BLON should be set to -9.999999. 454 42 DOR 1 1 ASCII_Real 13 meter [UNUSED] 2 14 ASCII_String 1 Field added during migration from PDS3 to accommodate inter-field bytes. These bytes are not documented in the PDS3 label. RLAT 8 496 ASCII_Real 9 radian Selenocentric latitude of the DSD ray closest approach point. Set to -9.999999 if the spacecraft is closer to the DSN receiver than the center of the Moon. -9.999999 RLON 9 506 ASCII_Real 9 radian Selenocentric east longitude of the DSD ray closest approach point. Set to -9.999999 if the spacecraft is closer to the DSN receiver than the center of the Moon. -9.999999 12 3 2 0 Center of Moon to specular point vector in J2000 coordinates. If the specular point does not exist, this vector is undefined and PLAT and PLON should be set to -9.999999 516 42 DOP 1 1 ASCII_Real 13 meter [UNUSED] 2 14 ASCII_String 1 Field added during migration from PDS3 to accommodate inter-field bytes. These bytes are not documented in the PDS3 label. THPI 10 558 ASCII_Real 9 radian Incidence angle at specular point. THPS 11 568 ASCII_Real 9 radian Reflection angle at specular point. PLAT 12 578 ASCII_Real 9 radian Selenocentric latitude of specular point. Set to -9.999999 if the specular point does not exist (the spacecraft is in occultation). -9.999999 PLON 13 588 ASCII_Real 9 radian Selenocentric east longitude of specular point. Set to -9.999999 if the specular point does not exist (the spacecraft is in occultation). -9.999999 bsrgeom.lbl 0 PDS3 Original PDS3 label Carriage-Return Line-Feed