JUNO Reference Orientation CK File for Gravity Science Passes ============================================================= Created on November 2, 2016 by Ben Bradley, JPL. Summary ------------------------------------------------------------- This file contains a reference attitude profile using MWR Tilt science passes for the new reference SPK (53-day orbits). The CK starts just before PJ2 and runs until PJ22 after the de-orbit burn. Start: 29 AUG 2016 09:00:00.000 UTC Stop : 12 SEP 2019 20:14:40.000 UTC Implementation Notes ------------------------------------------------------------- The JUNO_SPACECRAFT orientation is provided in this file using a combination of two kinds of segments: - segments providing the orientation of the JUNO spin axis (+Z) encapsulated in the orientation of the JUNO_SPIN_AXIS frame (frame ID -61900) relative to the J2000 inertial frame. These segments were generated using SPICE utility program "prediCkt" based on the spin axis pointing profile from the source e-mail. See Appendix 1 below for more details about these segments ("prediCkt" inputs, fit accuracy, etc.) - segments providing the rotation of the spacecraft about the spin axis encapsulated in the orientation of the JUNO_SPACECRAFT frame (frame ID -61000) relative to the JUNO_SPIN_AXIS frame. These segments were generated using SPICE utility program "msopck" based on the rotation profile from the source e-mail. See Appendix 2 below for details about these segments ("msopck" setup parameters, input, etc.). The segments generated by "prediCkt" and "msopck" were merged together into a single file (this file) using SPICE utility "dafcat". After merging the file was augmented with these comments. Modeling Notes ------------------------------------------------------------- Users of this CK file should be aware that: - the time-lines in the source spreadsheet did not include Earth-repointing precessions - the spin axis pointing (+Z of the JUNO_SPIN_AXIS frame) was modeled to be within 0.25 degrees of JUNO-Earth, or JUNO-Anti Orbital Momentum Vector (depending of the attitude mode). The ZX plane of the JUNO_SPIN_AXIS frame was modeled to always contain Ecliptic North, with the +X axis to be as close to it as possible. Coverage ------------------------------------------------------------- This file provides the continuous coverage for the following time period: Begin ET End ET ------------------------ ------------------------ 2016-08-29/09:01:08.182 2019-09-12/20:15:49.182 Related Kernels ------------------------------------------------------------- This was generated with and must be used together with the following kernels: Type Name ---- ------------------------------------------ LSK naif0012.tls SCLK JNO_SCLKSCET.00047.tsc FK juno_v09.tf (or later version) SPK jup310xl.juno.bsp SPK spk_ref_160829_190912_161027.bsp Contact Information ------------------------------------------------------------- Contact Ben Bradley (bbradley@jpl.nasa.gov) or Stuart Stephens (stuart.k.stephens@jpl.nasa.gov) if you have any questions regarding this file. Appendix 1: Information for Spin Axis Orientation Segments ============================================================= This C-kernels was produced using the SPICE program "prediCkt" on 2016-NOV-02 17:43:32. The following files were provided in support of the construction of the attitude given in this kernel. File Type Name ---- ------------------------------------------ SPK /Users/bbradley/Desktop/Code/Spice_datafiles/Juno/jup310xl.juno.bsp SPK /Users/bbradley/Desktop/Code/Spice_datafiles/Juno/spk_ref_160829_190912_ 161027.b TEXT /Users/bbradley/Desktop/Code/Spice_datafiles/naif0012.tls This C-kernel matches the specification given below to 0.25000 degrees. The text kernel used to specify the orientation of structures included in this file is given below. ============================================================= Spin Axis Orientation ----------------------------------------------------------------- The spin axis Orientation segments contain the orientation data for the JUNO_SPIN_AXIS frame (frame ID -61900) relative to the J2000 inertial frame. This file contains a reference attitude profile using MWR Tilt science passes for the new reference SPK (53-day orbits). The CK starts just before PJ2 and runs until PJ22 after the de-orbit burn. Start: 29 AUG 2016 09:00:00.000 UTC Stop : 12 SEP 2019 20:14:40.000 UTC These segments were generated using PREDICKT with the direction, orientation, and schedule specifications provided below based on the spreadsheet data. Directions ----------------------------------------------------------------- The directions defined in this section are based on the descriptions from sheet 3 of the spreadsheet. TOSUN is the geometric position of the Sun relative to JUNO. TOEARTH is the geometric position of the Earth relative to JUNO. JUNOPOS is the geometric position of JUNO relative to Jupiter. JUNOVEL is the geometric velocity of JUNO relative to Jupiter. JUNOORB is the JUNO orbital momentum vector computed as the cross product of the JUNO position and velocity relative to Jupiter. JUNOORB14 is the JUNO orbital momentum vector rotated by -14 degrees about JUNOPOS. ECLIPN is the +Z axis (North pole) of the Ecliptic of J2000 inertial frame (ECLIPJ2000). JOIZ is the reference direction for +Z axis during JOI burn -- RA=268.422 deg, Dec=62.359 deg in EME2000. PRMZ is the reference direction for +Z axis during PRM burn -- RA=268.381 deg, Dec=60.061 deg in EME2000. DEORBITZ is the reference direction for +Z axis during the Deorbit burn -- RA=76.668 deg, Dec=-42.089 deg in EME2000. ORBXEARTH is the vector normal to the TOEARTH and JUNOORB vectors in the direction of Jupiter's +Z body axis HALFMWR is an intermediate vector between the TOSUN and -JUNOORB vectors. The TOSUN vector is rotated -20 degrees about the ORBXEARTH vector. \begindata DIRECTION_SPECS += ( 'TOSUN = POSITION OF SUN -' ) DIRECTION_SPECS += ( 'FROM JUNO -' ) DIRECTION_SPECS += ( 'CORRECTION NONE' ) DIRECTION_SPECS += ( 'TOEARTH = POSITION OF EARTH -' ) DIRECTION_SPECS += ( 'FROM JUNO -' ) DIRECTION_SPECS += ( 'CORRECTION NONE' ) DIRECTION_SPECS += ( 'JUNOPOS = POSITION OF JUNO -' ) DIRECTION_SPECS += ( 'FROM JUPITER -' ) DIRECTION_SPECS += ( 'CORRECTION NONE' ) DIRECTION_SPECS += ( 'JUNOVEL = VELOCITY OF JUNO -' ) DIRECTION_SPECS += ( 'FROM JUPITER -' ) DIRECTION_SPECS += ( 'CORRECTION NONE' ) DIRECTION_SPECS += ( 'JUNOORB = CROSS PRODUCT -' ) DIRECTION_SPECS += ( 'JUNOPOS JUNOVEL ' ) DIRECTION_SPECS += ( 'JUNOORB14 = ROTATE JUNOORB -' ) DIRECTION_SPECS += ( '-14 DEGREES -' ) DIRECTION_SPECS += ( 'ABOUT JUNOPOS ' ) DIRECTION_SPECS += ( 'ECLIPN = FIXED ECLIPJ2000 -' ) DIRECTION_SPECS += ( 'XYZ 0 0 1' ) DIRECTION_SPECS += ( 'JOIZ = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 268.422 degrees -' ) DIRECTION_SPECS += ( 'DEC 62.359 degrees ' ) DIRECTION_SPECS += ( 'PRMZ = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 268.381 degrees -' ) DIRECTION_SPECS += ( 'DEC 60.061 degrees ' ) DIRECTION_SPECS += ( 'DEORBITZ = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 76.668 degrees -' ) DIRECTION_SPECS += ( 'DEC -42.089 degrees ' ) DIRECTION_SPECS += ( 'ORBXEARTH = CROSS PRODUCT -' ) DIRECTION_SPECS += ( 'TOEARTH JUNOORB ' ) DIRECTION_SPECS += ( 'HALFMWR = ROTATE TOSUN -' ) DIRECTION_SPECS += ( '-20 DEGREES -' ) DIRECTION_SPECS += ( 'ABOUT ORBXEARTH ' ) DIRECTION_SPECS += ( 'PRE28 = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 8.0 degrees -' ) DIRECTION_SPECS += ( 'DEC 35.5 degrees ' ) \begintext Orientations ----------------------------------------------------------------- The orientation modes defined in this section are based on the descriptions from sheet 3 of the spreadsheet. SUNPOINTED orientation has +Z along direction from JUNO to the Sun and Ecliptic North pole defining the ZX plane. EARTHPOINTED orientation has +Z along direction from JUNO to the Earth and Ecliptic North pole defining the ZX plane. MWRATTITUDE orientation has -Z along JUNO orbital momentum vector (POS cross VEL) and Ecliptic North pole defining the ZX plane. MWRATTITUDETILT14 orientation has -Z along JUNO orbital momentum vector (POS cross VEL) rotated by -14 degrees about POS and Ecliptic North pole defining the ZX plane. JOIBURN orientation has +Z along the reference direction during the JOI burn and Ecliptic North pole defining the ZX plane. PRMBURN orientation has +Z along the reference direction during the PRM burn and Ecliptic North pole defining the ZX plane. DEORBITBURN orientation has +Z along the reference direction during the DEORBIT burn and Ecliptic North pole defining the ZX plane. HALFMWRATTITUDE orientation has +Z along the reference direction HALFMWR and Ecliptic North pole defining ZX plane. \begindata ORIENTATION_NAME += 'SUNPOINTED' PRIMARY += '+Z = TOSUN' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'EARTHPOINTED' PRIMARY += '+Z = TOEARTH' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'MWRATTITUDE' PRIMARY += '-Z = JUNOORB' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'MWRATTITUDETILT14' PRIMARY += '-Z = JUNOORB14' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'JOIBURN' PRIMARY += '+Z = JOIZ' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PRMBURN' PRIMARY += '+Z = PRMZ' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'DEORBITBURN' PRIMARY += '+Z = DEORBITZ' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'HALFMWRATTITUDE' PRIMARY += '+Z = HALFMWR' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PRE28ATTITUDE' PRIMARY += '+Z = PRE28' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' \begintext Schedule ----------------------------------------------------------------- The orientation schedule defined in this section implements the spin axis pointing timeline from sheet 1 of the spreadsheet. These times in 'AT' modifiers and START/STOP keywords are given as ETs. Gaps between attitude modes result in smooth turns from one attitude to the next. \begindata CK-SCLK = 61 CK-SPK = -61 CK-FRAMES = -61900 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2016-08-29/09:01:08.182 CK-61900STOP += @2016-10-18/22:20:38.182 \begintext ******************* PJ2 ****************** \begindata CK-61900ORIENTATION += 'EARTHPOINTED AT 2016-10-19/15:12:01.182' CK-61900START += @2016-10-18/22:25:38.182 CK-61900STOP += @2016-10-20/15:21:58.182 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2016-10-20/15:26:58.182 CK-61900STOP += @2016-12-10/21:17:38.182 \begintext ******************* PJ3 ****************** \begindata CK-61900ORIENTATION += 'EARTHPOINTED AT 2016-12-11/14:05:08.182' CK-61900START += @2016-12-10/21:22:38.182 CK-61900STOP += @2016-12-11/23:05:38.182 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2016-12-11/23:10:38.182 CK-61900STOP += @2017-02-01/17:11:43.184 \begintext ******************* PJ4 ****************** \begindata CK-61900ORIENTATION += 'MWRATTITUDETILT14 AT 2017-02-02/13:01:44.184' CK-61900START += @2017-02-01/17:16:43.184 CK-61900STOP += @2017-02-02/19:17:43.184 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2017-02-02/19:22:43.184 CK-61900STOP += @2017-03-26/13:05:51.184 \begintext ******************* PJ5 ****************** \begindata CK-61900ORIENTATION += 'MWRATTITUDETILT14 AT 2017-03-27/08:56:14.184' CK-61900START += @2017-03-26/13:10:51.184 CK-61900STOP += @2017-03-27/15:11:51.184 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2017-03-27/15:16:51.184 CK-61900STOP += @2017-05-18/10:14:22.185 \begintext ******************* PJ6 ****************** \begindata CK-61900ORIENTATION += 'MWRATTITUDETILT14 AT 2017-05-19/06:05:07.185' CK-61900START += @2017-05-18/10:19:22.185 CK-61900STOP += @2017-05-19/12:20:22.185 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2017-05-19/12:25:22.185 CK-61900STOP += @2017-07-10/06:08:27.184 \begintext ******************* PJ7 ****************** \begindata CK-61900ORIENTATION += 'MWRATTITUDETILT14 AT 2017-07-11/01:59:34.184' CK-61900START += @2017-07-10/06:13:27.184 CK-61900STOP += @2017-07-11/08:14:27.184 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2017-07-11/08:19:27.184 CK-61900STOP += @2017-09-01/02:02:32.184 \begintext ******************* PJ8 ****************** \begindata CK-61900ORIENTATION += 'MWRATTITUDETILT14 AT 2017-09-01/21:54:01.184' CK-61900START += @2017-09-01/02:07:32.184 CK-61900STOP += @2017-09-02/04:08:32.184 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2017-09-02/04:13:32.184 CK-61900STOP += @2017-10-23/21:56:35.184 \begintext ******************* PJ9 ****************** \begindata CK-61900ORIENTATION += 'MWRATTITUDETILT14 AT 2017-10-24/17:48:28.184' CK-61900START += @2017-10-23/22:01:35.184 CK-61900STOP += @2017-10-24/23:41:35.184 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2017-10-24/23:46:35.184 CK-61900STOP += @2017-12-15/22:11:18.184 \begintext ******************* PJ10 ****************** \begindata CK-61900ORIENTATION += 'MWRATTITUDETILT14 AT 2017-12-16/18:03:33.184' CK-61900START += @2017-12-15/22:16:18.184 CK-61900STOP += @2017-12-17/00:17:18.184 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2017-12-17/00:22:18.184 CK-61900STOP += @2018-02-06/18:05:54.184 \begintext ******************* PJ11 ****************** \begindata CK-61900ORIENTATION += 'MWRATTITUDETILT14 AT 2018-02-07/13:58:16.184' CK-61900START += @2018-02-06/18:10:54.184 CK-61900STOP += @2018-02-07/20:11:54.184 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2018-02-07/20:16:54.184 CK-61900STOP += @2018-03-31/13:59:54.184 \begintext ******************* PJ12 ****************** \begindata CK-61900ORIENTATION += 'MWRATTITUDETILT14 AT 2018-04-01/09:52:43.184' CK-61900START += @2018-03-31/14:04:54.184 CK-61900STOP += @2018-04-01/16:05:54.184 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2018-04-01/16:10:54.184 CK-61900STOP += @2018-05-23/09:53:56.184 \begintext ******************* PJ13 ****************** \begindata CK-61900ORIENTATION += 'MWRATTITUDETILT14 AT 2018-05-24/05:47:11.184' CK-61900START += @2018-05-23/09:58:56.184 CK-61900STOP += @2018-05-24/11:59:56.184 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2018-05-24/12:04:56.184 CK-61900STOP += @2018-07-15/09:31:14.184 \begintext ******************* PJ14 ****************** \begindata CK-61900ORIENTATION += 'MWRATTITUDETILT14 AT 2018-07-16/05:24:58.184' CK-61900START += @2018-07-15/09:36:14.184 CK-61900STOP += @2018-07-16/11:37:14.184 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2018-07-16/11:42:14.184 CK-61900STOP += @2018-09-06/05:26:17.184 \begintext ******************* PJ15 ****************** \begindata CK-61900ORIENTATION += 'MWRATTITUDETILT14 AT 2018-09-07/01:19:59.184' CK-61900START += @2018-09-06/05:31:17.184 CK-61900STOP += @2018-09-07/07:32:17.184 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2018-09-07/07:37:17.184 CK-61900STOP += @2018-10-29/01:20:20.184 \begintext ******************* PJ16 ****************** \begindata CK-61900ORIENTATION += 'MWRATTITUDETILT14 AT 2018-10-29/21:14:32.184' CK-61900START += @2018-10-29/01:25:20.184 CK-61900STOP += @2018-10-30/03:26:20.184 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2018-10-30/03:31:20.184 CK-61900STOP += @2018-12-20/21:14:23.184 \begintext ******************* PJ17 ****************** \begindata CK-61900ORIENTATION += 'MWRATTITUDETILT14 AT 2018-12-21/17:09:06.184' CK-61900START += @2018-12-20/21:19:23.184 CK-61900STOP += @2018-12-21/23:20:23.184 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2018-12-21/23:25:23.184 CK-61900STOP += @2019-02-11/21:48:44.184 \begintext ******************* PJ18 ****************** \begindata CK-61900ORIENTATION += 'MWRATTITUDETILT14 AT 2019-02-12/17:43:22.184' CK-61900START += @2019-02-11/21:53:44.184 CK-61900STOP += @2019-02-12/23:54:44.184 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2019-02-12/23:59:44.184 CK-61900STOP += @2019-04-05/17:42:44.184 \begintext ******************* PJ19 ****************** \begindata CK-61900ORIENTATION += 'MWRATTITUDETILT14 AT 2019-04-06/13:37:58.184' CK-61900START += @2019-04-05/17:47:44.184 CK-61900STOP += @2019-04-06/19:48:44.184 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2019-04-06/19:53:44.184 CK-61900STOP += @2019-05-28/13:36:49.184 \begintext ******************* PJ20 ****************** \begindata CK-61900ORIENTATION += 'MWRATTITUDETILT14 AT 2019-05-29/09:32:39.184' CK-61900START += @2019-05-28/13:41:49.184 CK-61900STOP += @2019-05-29/15:42:49.184 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2019-05-29/15:47:49.184 CK-61900STOP += @2019-07-20/09:31:14.184 \begintext ******************* PJ21 ****************** \begindata CK-61900ORIENTATION += 'MWRATTITUDETILT14 AT 2019-07-21/05:27:31.182' CK-61900START += @2019-07-20/09:36:14.182 CK-61900STOP += @2019-07-21/11:16:14.182 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2019-07-21/11:21:14.182 CK-61900STOP += @2019-08-16/13:19:30.182 \begintext ************ DEORBIT BURN ATTITUDE *********** \begindata CK-61900ORIENTATION += 'DEORBITBURN AT 2019-08-16/15:52:00.182' CK-61900START += @2019-08-16/13:24:30.182 CK-61900STOP += @2019-08-16/18:19:30.182 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2019-08-16/18:24:30.182 CK-61900STOP += @2019-09-10/20:12:14.182 \begintext ******************* PJ22 ****************** \begindata CK-61900ORIENTATION += 'MWRATTITUDETILT14 AT 2019-09-11/20:22:26.182' CK-61900START += @2019-09-10/20:17:14.182 CK-61900STOP += @2019-09-12/20:15:49.182 \begintext Appendix 2: Information for Rotation About Spin Axis Segment ============================================================= ******************************************************************************** MSOPCK SETUP FILE: juno_sc_nom_160829_190912_mwrtilt_spin.setup ******************************************************************************** Spin Orientation ----------------------------------------------------------------- The spin orientation segment contains the orientation data representing rotation of the JUNO_SPACECRAFT frame (frame ID -61000) about the JUNO_SPIN_AXIS frame (frame ID -61900). Spin Rate Start UTC End UTC Note --------- ----------------- ----------------- -------- 2 rpm 08/29/16 09:00:00 11/12/19 20:14:40 The profile above was converted to the following input provided to MSOPCK to make this segment (the columns are: start time, stop time, initial orientation as three angles set to zero, and angular velocity representing CCW rotation about +Z): 2016-08-29/09:01:08TDB 2019-09-12/20:15:10TDB 0 0 0 0 0 0.20943951023932 The following MSOPCK setup parameters were used to generate this segment: \begindata LSK_FILE_NAME = '../../naif0012.tls' SCLK_FILE_NAME = '../JNO_SCLKSCET.00047.tsc' FRAMES_FILE_NAME = '../juno_v09.tf' INTERNAL_FILE_NAME = 'JUNO REF GRAV SPIN ATTITUDE, 11/02/16' CK_TYPE = 2 CK_SEGMENT_ID = 'JUNO REF GRAV SPIN ATTITUDE, 11/02/16' INSTRUMENT_ID = -61000 REFERENCE_FRAME_NAME = 'JUNO_SPIN_AXIS' ANGULAR_RATE_PRESENT = 'YES' INPUT_TIME_TYPE = 'UTC' INPUT_DATA_TYPE = 'EULER ANGLES' EULER_ANGLE_UNITS = 'RADIANS' EULER_ROTATIONS_ORDER = ( 'X' 'Y' 'Z' ) ANGULAR_RATE_FRAME = 'INSTRUMENT' PRODUCER_ID = 'NAIF/JPL' \begintext ******************************************************************************** RUN-TIME OBTAINED META INFORMATION: ******************************************************************************** PRODUCT_CREATION_TIME = 2016-11-02T17:48:04 START_TIME = 2016-08-29T08:59:59.817 STOP_TIME = 2019-09-12T20:14:00.817 ******************************************************************************** INTERPOLATION INTERVALS IN THE FILE SEGMENTS: ******************************************************************************** SEG.SUMMARY: ID -61000, COVERG: 2016-08-29T08:59:59.817 2019-09-12T20:14:00.817 -------------------------------------------------------------------------------- 2016-08-29T08:59:59.817 2019-09-12T20:14:00.817 ******************************************************************************** End of comments.