JUNO Reference Orientation CK File ============================================================= Created on Apr 29, 2020 by Martin Brennan, JPL. Summary ------------------------------------------------------------- This file contains a STUDY attitude profile for PJ30, PJ31, and PJ32, using the latest reference trajectory (spk_ref_180429_210731_180509.bsp). This CK spans orbits 30-32, from the start of jm0301 through the end of jm0322. Each of these study attitudes were developed to be as close to the MWR orientation (Juno spin axis aligned with the positive orbit normal) while maintaining a 35 deg Off-Sun limit. Start: 07 NOV 2020 01:00:00.000 UTC Stop : 14 APR 2021 13:00:00.000 UTC These segments were generated using PREDICKT with the direction, orientation, and schedule specifications provided below based on the spreadsheet data. The attitude mode for each Perijove pass is listed below: PJ 00 JOI PJ 01 GRAV PJ 02 GRAV PJ 03 GRAV PJ 04 MWR PJ 05 MWR-tilt PJ 06 GRAV PJ 07 MWR PJ 08 GRAV PJ 09 MWR-tilt w/ 35deg-offset PJ 10 GRAV PJ 11 GRAV PJ 12 MWR -30/+20deg-offset PJ 13 GRAV PJ 14 GRAV PJ 15 GRAV PJ 16 MWR -30/+20deg-offset PJ 17 GRAV PJ 18 GRAV PJ 19 MWR-crosstrack: South-facing and offset 1.5deg East then 10deg North PJ 20 MWR -30/+5deg-offset PJ 21 GRAV PJ 22 GRAV PJ 23 GRAV PJ 24 59OFF & -4.5/+0deg-offset PJ 25 GRAV PJ 26 MWR +34/-9deg-offset PJ 27 GRAV PJ 28 GRAV PJ 29 GRAV PJ 30 MWR +34/-8deg-offset PJ 31 MWR +34/-8deg-offset PJ 32 MWR +34/-8deg-offset PJ 33 GRAV PJ 34 GRAV PJ 35 Deorbit (But modeled as EarthPoint) 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 continuous coverage for the following time period: Begin TDB End TDB ------------------------ ------------------------ 2020-11-07/01:01:09.183 2021-04-14/13:01:09.186 Related Kernels ------------------------------------------------------------- This was generated and must be used together with the following kernels: Type Name ---- ------------------------------------------ LSK naif0012.tls SCLK JNO_SCLKSCET.00099.tsc FK juno_v12.tf SPK jup310.bsp SPK spk_ref_180429_210731_180509.bsp Contact Information ------------------------------------------------------------- Contact Marty Brennan (martin.brennan@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 2020-APR-29 22:20:19. The following files were provided in support of the construction of the attitude given in this kernel. File Type Name ---- ------------------------------------------ SPK /Users/mbrennan/Documents/JUNO/SPICE/spk/jup310.bsp SPK /Users/mbrennan/Documents/JUNO/SPICE/spk/spk_ref_180429_210731_180509.bsp TEXT /Users/mbrennan/Documents/JUNO/SPICE/lsk/naif0012.tls TEXT /Users/mbrennan/Documents/JUNO/SPICE/pck/pck00010.tpc 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 STUDY attitude profile for PJ30, PJ31, and PJ32, using the latest reference trajectory (spk_ref_180429_210731_180509.bsp). This CK spans orbits 30-32, from the start of jm0301 through the end of jm0322. Each of these study attitudes were developed to be as close to the MWR orientation (Juno spin axis aligned with the positive orbit normal) while maintaining a 35 deg Off-Sun limit. Start: 07 NOV 2020 01:00:00.000 UTC Stop : 14 APR 2021 13:00:00.000 UTC These segments were generated using PREDICKT with the direction, orientation, and schedule specifications provided below based on the spreadsheet data. The attitude mode for each Perijove pass is listed below: PJ 00 JOI PJ 01 GRAV PJ 02 GRAV PJ 03 GRAV PJ 04 MWR PJ 05 MWR-tilt PJ 06 GRAV PJ 07 MWR PJ 08 GRAV PJ 09 MWR-tilt w/ 35deg-offset PJ 10 GRAV PJ 11 GRAV PJ 12 MWR -30/+20deg-offset PJ 13 GRAV PJ 14 GRAV PJ 15 GRAV PJ 16 MWR -30/+20deg-offset PJ 17 GRAV PJ 18 GRAV PJ 19 MWR-crosstrack: South-facing and offset 1.5deg East then 10deg North PJ 20 MWR -30/+5deg-offset PJ 21 GRAV PJ 22 GRAV PJ 23 GRAV PJ 24 59OFF & -4.5/+0deg-offset PJ 25 GRAV PJ 26 MWR +34/-9deg-offset PJ 27 GRAV PJ 28 GRAV PJ 29 GRAV PJ 30 MWR +34/-8deg-offset PJ 31 MWR +34/-8deg-offset PJ 32 MWR +34/-8deg-offset PJ 33 GRAV PJ 34 GRAV PJ 35 Deorbit (But modeled as EarthPoint) 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. JUPN is the Jupiter North Pole vector defined in the J2000 frame. 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. JNPXSUN is the cross product between Jupiter North Pole direction and the Sun direction relative to JUNO, set for PJ19 MWRX## tilt rotation axis. JNPXJUNO is the cross product between Jupiter North Pole direction and the Juno Position vector, set for PJ19 MWRXSTILT10 rotation axis. PJ05_JUNOORB14 is the JUNO orbital momentum vector rotated by -14 deg about JUNOPOS, as used for PJ05. RA = -7.67890341853399 deg, DEC = 13.9432383950883 deg in EME2000 PJ09_SUNOFF35 is a truncated MWR-TILT attitude for PJ09 set to achieve a 35 degree Sun-offset. RA = -4.43652617866635 deg, DEC = 16.0002139331956 deg in EME2000 PJ12_SUNOFFN30P20 is a truncated MWR -30 deg azimuth (towards Jupiter dawn) / +20 deg elevation (towards Jupiter N. Pole) offset from Jupiter-Sun vector for PJ12, set to achieve a 35 deg Sun-offset. RA = 6.814291308591435 deg, DEC = 23.063601975942941 deg in EME2000 PJ16_SUNOFFN30P20 is a truncated MWR -30 deg azimuth (towards Jupiter dawn) / +20 deg elevation (towards Jupiter N. Pole) offset from Jupiter-Sun vector for PJ16, set to achieve a 35 deg Sun-offset. RA = 22.5251963999149 deg, DEC = 29.7685436940511 deg in EME2000 PJ19_MWRXSTILT10 is the South-facing MWR-crosstrack attitude tilted 1.5 deg about the Jupiter-Juno position vector at Equator-crossing (towards the East) and then tilted 10 deg North (in plane containing Jupiter N Pole and Juno Nadir) for PJ19 to allow for more Sun Exposure on solar cells and somewhat constant latitude coverage during each MWR swath. RA = 91.0515591011937 deg, DEC = -54.49840349731 deg in EME2000 PJ20_SUNOFFN30P5 is an untruncated MWR -30 deg azimuth (towards Jupiter dawn)/ +5 deg elevation (towards Jupiter N. Pole) offset from Jupiter-Sun vector for PJ20. RA = 44.3942020462189 deg, DEC = 21.8505938576328 deg in EME2000 PJ22_SUNOFFN34P6 is an untruncated MWR -34.48236316 deg azimuth (towards Jupiter dawn) / +6.40821329 deg elevation (towards Jupiter N. Pole) offset from Jupiter-Sun vector for PJ22, effectively towards Juno NON. RA = 48.0853400708958 deg, DEC = 24.6850564147346 deg in EME2000 PJ23_SUNOFFP34N9 is an untruncated MWR +33.99540611 deg azimuth (towards Jupiter dusk) / -8.87752776 deg elevation (towards Jupiter S. Pole) offset from Jupiter-Sun vector for PJ23, effectively towards Juno PON. RA = 124.945635337186 deg, DEC = 9.76036929851886 deg in EME2000 PJ24_SUNOFF59OPT is a attitude orientation for PJ24 redefined by JIRAM Team with the J2000 vector [0.78590 0.45582 0.41783] for Ganymede observations, having a Sun-Offset angle of 59.4499236757193 deg. This orientation is designated by the JIRAM Team to be the optimal offset attitude for PJ24 Ganymede observations. The equivalent AZ/EL is -58.833495610326 deg (towards Jupiter dawn) / 10.8416367143037 deg (towards Jupiter S. Pole) offset from the Jupiter-Sun vector for PJ24. RA = 30.113438913339 deg, DEC = 24.6979240941459 deg in EME2000 PJ24_SUNOFFN5P0 is a attitude orientation for PJ24 defined by the Radiation Monitoring Team with a -4.5 deg azimuth (towards Jupiter dawn) / +0.0 deg elevation offset from Jupiter-Sun vector for PJ24. The equivalent J2000 vector is [-0.01470626 0.91763878 0.39714328]. RA = 90.9181550123059 deg, DEC = 23.3997122946027 deg in EME2000 PJ25_SUNOFFP34N9 is an untruncated MWR +34.02403889 deg azimuth (towards Jupiter dusk) / -8.75518549 deg elevation (towards Jupiter S. Pole) offset from Jupiter-Sun vector for PJ25, effectively towards Juno PON. RA = 133.336716594812 deg, DEC = 7.70219994848738 deg in EME2000 PJ26_SUNOFFP34N9 is an untruncated MWR +34.03897912 deg azimuth (towards Jupiter dusk) / -8.69056334 deg elevation (towards Jupiter S. Pole) offset from Jupiter-Sun vector for PJ26, effectively towards Juno PON. RA = 137.523758779564 deg, DEC = 6.52863505581866 deg in EME2000 PJ28_SUNOFFP34N8 is an untruncated MWR +34.08544948 deg azimuth (towards Jupiter dusk) / -8.48522601 deg elevation (towards Jupiter S. Pole) offset from Jupiter-Sun vector for PJ28, effectively towards Juno PON. RA = 145.940779445879 deg, DEC = 3.97316670713293 deg in EME2000 PJ29_SUNOFFP34N8 is an untruncated MWR +34.10233933 deg azimuth (towards Jupiter dusk) / -8.40971788 deg elevation (towards Jupiter S. Pole) offset from Jupiter-Sun vector for PJ29, effectively towards Juno PON. RA = 150.137849515941 deg, DEC = 2.54726615558709 deg in EME2000 PJ30_SUNOFFP34N8 is an untruncated MWR +34.12515087 deg azimuth (towards Jupiter dusk) / -8.30606577 deg elevation (towards Jupiter S. Pole) offset from Jupiter-Sun vector for PJ30, effectively towards Juno PON. RA = 154.370793962178 deg, DEC = 1.06616196069811 deg in EME2000 PJ31_SUNOFFP34N8 is an untruncated MWR +34.14701273 deg azimuth (towards Jupiter dusk) / -8.20547010 deg elevation (towards Jupiter S. Pole) offset from Jupiter-Sun vector for PJ31, effectively towards Juno PON. RA = 158.601757482581 deg, DEC = -0.479979057460875 deg in EME2000 PJ32_SUNOFFP34N8 is an untruncated MWR +34.18565809 deg azimuth (towards Jupiter dusk) / -8.02339326 deg elevation (towards Jupiter S. Pole) offset from Jupiter-Sun vector for PJ32, effectively towards Juno PON. RA = 162.899003473417 deg, DEC = -2.01783763525042 deg in EME2000 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=153.68 deg, Dec=12.39 deg in EME2000. (BUT USES EARTHPOINT) 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 deg about the ORBXEARTH vector. \begindata DIRECTION_SPECS += ( 'TOSUN = POSITION OF SUN -' ) DIRECTION_SPECS += ( 'FROM JUNO -' ) DIRECTION_SPECS += ( 'CORRECTION LT+S' ) DIRECTION_SPECS += ( 'TOEARTH = POSITION OF EARTH -' ) DIRECTION_SPECS += ( 'FROM JUNO -' ) DIRECTION_SPECS += ( 'CORRECTION XLT+S' ) 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 += ( 'PJ05_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 153.68 DEGREES -' ) DIRECTION_SPECS += ( 'DEC 12.39 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 += ( 'JUPN = FIXED IAU_JUPITER -' ) DIRECTION_SPECS += ( 'XYZ 0 0 1' ) DIRECTION_SPECS += ( 'JUPS = FIXED IAU_JUPITER -' ) DIRECTION_SPECS += ( 'XYZ 0 0 -1' ) DIRECTION_SPECS += ( 'JNPXSUN = CROSS PRODUCT -' ) DIRECTION_SPECS += ( 'JUPN TOSUN ' ) DIRECTION_SPECS += ( 'JSPXSUN = CROSS PRODUCT -' ) DIRECTION_SPECS += ( 'JUPS TOSUN ' ) DIRECTION_SPECS += ( 'JNPXJUNO = CROSS PRODUCT -' ) DIRECTION_SPECS += ( 'JUPN JUNOPOS ' ) DIRECTION_SPECS += ( 'MWRXSTILT = ROTATE JUPS -' ) DIRECTION_SPECS += ( '1.5 DEGREES -' ) DIRECTION_SPECS += ( 'ABOUT JUNOPOS ' ) DIRECTION_SPECS += ( 'PJ09_SUNOFF35 = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA -4.4365261787 degrees -' ) DIRECTION_SPECS += ( 'DEC 16.000213933 degrees ' ) DIRECTION_SPECS += ( 'PJ12_SUNOFFN30P20 = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 6.81429131 DEGREES -' ) DIRECTION_SPECS += ( 'DEC 23.06360198 DEGREES ' ) DIRECTION_SPECS += ( 'PJ16_SUNOFFN30P20 = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 22.52519640 DEGREES -' ) DIRECTION_SPECS += ( 'DEC 29.76854369 DEGREES ' ) DIRECTION_SPECS += ( 'PJ19_MWRXSTILT10 = ROTATE MWRXSTILT -' ) DIRECTION_SPECS += ( '-10 DEGREES -' ) DIRECTION_SPECS += ( 'ABOUT JNPXJUNO ' ) DIRECTION_SPECS += ( 'PJ20_SUNOFFN30P5 = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 44.39420205 DEGREES -' ) DIRECTION_SPECS += ( 'DEC 21.85059386 DEGREES ' ) DIRECTION_SPECS += ( 'PJ22_SUNOFFN34P6 = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 48.08534007 DEGREES -' ) DIRECTION_SPECS += ( 'DEC 24.68505641 DEGREES ' ) DIRECTION_SPECS += ( 'PJ23_SUNOFFP34N9 = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 124.94563534 DEGREES -' ) DIRECTION_SPECS += ( 'DEC 9.76036930 DEGREES ' ) DIRECTION_SPECS += ( 'PJ24_SUNOFF59OPT = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 30.11343891 DEGREES -' ) DIRECTION_SPECS += ( 'DEC 24.69792409 DEGREES ' ) DIRECTION_SPECS += ( 'PJ24_SUNOFFN5P0 = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 90.91815501 DEGREES -' ) DIRECTION_SPECS += ( 'DEC 23.39971229 DEGREES ' ) DIRECTION_SPECS += ( 'PJ25_SUNOFFP34N9 = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 133.33671659 DEGREES -' ) DIRECTION_SPECS += ( 'DEC 7.70219995 DEGREES ' ) DIRECTION_SPECS += ( 'PJ26_SUNOFFP34N9 = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 137.52375878 DEGREES -' ) DIRECTION_SPECS += ( 'DEC 6.52863506 DEGREES ' ) DIRECTION_SPECS += ( 'PJ27_SUNOFFP34N9 = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 141.73479067 DEGREES -' ) DIRECTION_SPECS += ( 'DEC 5.29836427 DEGREES ' ) DIRECTION_SPECS += ( 'PJ28_SUNOFFP34N8 = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 145.94077945 DEGREES -' ) DIRECTION_SPECS += ( 'DEC 3.97316671 DEGREES ' ) DIRECTION_SPECS += ( 'PJ29_SUNOFFP34N8 = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 150.13784952 DEGREES -' ) DIRECTION_SPECS += ( 'DEC 2.54726616 DEGREES ' ) DIRECTION_SPECS += ( 'PJ30_SUNOFFP34N8 = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 154.37079396 DEGREES -' ) DIRECTION_SPECS += ( 'DEC 1.06616196 DEGREES ' ) DIRECTION_SPECS += ( 'PJ31_SUNOFFP34N8 = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 158.60175748 DEGREES -' ) DIRECTION_SPECS += ( 'DEC -0.47997906 DEGREES ' ) DIRECTION_SPECS += ( 'PJ32_SUNOFFP34N8 = FIXED J2000 -' ) DIRECTION_SPECS += ( 'RA 162.89900347 DEGREES -' ) DIRECTION_SPECS += ( 'DEC -2.01783764 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. MWRNON orientation has -Z along JUNO orbital momentum vector (POS cross VEL) and Ecliptic North pole defining the ZX plane. MWRPON orientation has +Z along JUNO orbital momentum vector (POS cross VEL) and Ecliptic North pole defining the ZX plane. MWRCROSSTRACK orientation has +Z aligned with Jupiter North Pole vector and the Sun defining the ZX plane. PJ05_MWRNONTILT14 orientation has -Z along JUNO orbital momentum vector (POS cross VEL) rotated by -14 deg about POS and Ecliptic North pole defining the ZX plane, as used for PJ05. Resulting RA/Dec (deg) in J2000 (EME2000): -7.67890342 / 13.94323840 PJ09_MWRNONTILT35 orientation towards MWR-TILT attitude, but is truncated in order to achieve a 35 degree sun-offset at PJ09. Resulting RA/Dec (deg) in J2000 (EME2000): -4.436526180 / 16.00021393 PJ12_MWRN30P20 orientation has +Z along -30 deg azimuth (towards Jupiter dawn) / +20 deg elevation (towards Jupiter N. Pole) offset from Jupiter-Sun vector, but is truncated in order to achieve a 35 deg Sun-offset at PJ12. Resulting RA/Dec (deg) in J2000 (EME2000): 6.81429131 / 23.06360198 PJ16_MWRN30P20 orientation has +Z along -30 deg azimuth (towards Jupiter dawn) / +20 deg elevation (towards Jupiter N. Pole) offset from Jupiter-Sun vector, but is truncated in order to achieve a 35 deg Sun-offset at PJ16. Resulting RA/Dec (deg) in J2000 (EME2000): 22.52519640 / 29.76854369 PJ19_MWRCROSSTRACKSTILT10 orientation is the MWRCROSSTRACKS orientation but tilted 1.5 deg about the Jupiter-Juno vector at Equator-crossing (towards East) and tilted 10 deg North (in plane containing Jupiter N Pole and Juno Nadir) for PJ19 to allow for more Sun Exposure on solar cells and somewhat constant latitude coverage during each MWR swath. Resulting RA/Dec (deg) in J2000 (EME2000): 91.05155910 / -54.49840350 PJ20_MWRN30P5 orientation has +Z along -30 deg azimuth (towards Jupiter dawn) / +5 deg elevation (towards Jupiter N. Pole) offset from Jupiter-Sun vector and is untruncated for PJ20, since the off-Sun angle is less than 35 deg (30.375 deg). Resulting RA/Dec (deg) in J2000 (EME2000): 44.39420205 / 21.85059386 PJ22_MWRN34P6 orientation has +Z along -34.48236316 deg azimuth (towards Jupiter dawn) / +6.40821329 deg elevation (towards Jupiter N. Pole) offset from Jupiter-Sun vector for PJ22, where the off-Sun angle is 35 deg, effectively towards Juno NON. Resulting RA/Dec (deg) in J2000 (EME2000): 48.08534007 / 24.68505641 PJ23_MWRP34N9 orientation has +Z along +33.99540611 deg azimuth (towards Jupiter dusk) / -8.87752776 deg elevation (towards Jupiter S. Pole) offset from Jupiter-Sun vector for PJ23, where the off-Sun angle is 35 deg, effectively towards Juno PON. Resulting RA/Dec (deg) in J2000 (EME2000): 124.94563534 / 9.76036930 PJ24_SUNOFFSETNEG59OPT orientation redefined by the JIRAM Team for Ganymede observations during PJ24 with a 59.4499236757193 deg Sun-Offset angle, provided as J2000 vector: [0.78590 0.45582 0.41783]. The equivalent AZ/EL is -58.83349561 deg (towards Jupiter dawn) / 10.84163671 deg (towards Jupiter S. Pole) offset from the Jupiter-Sun vector for PJ24. Resulting RA/Dec (deg) in J2000 (EME2000): 30.11343891 / 24.69792409 PJ24_RMSUNOFFN5P0 orientation has +Z along -4.5 deg azimuth (towards Jupiter dawn) / +0.0 deg elevation offset from Jupiter-Sun vector, where the off-Sun angle is equal to 4.49757900505857 deg. The equivalent J2000 vector is [-0.01470626 0.91763878 0.39714328]. Resulting RA/Dec (deg) in J2000 (EME2000): 90.91815501 / 23.39971229 PJ25_MWRP34N9 orientation has +Z along +34.02403889 deg azimuth (towards Jupiter dusk) / -8.75518549 deg elevation (towards Jupiter S. Pole) offset from Jupiter-Sun vector for PJ25, where the off-Sun angle is 35 deg, effectively towards Juno PON. Resulting RA/Dec (deg) in J2000 (EME2000): 133.33671659 / 7.70219995 PJ26_MWRP34N9 orientation has +Z along +34.03897912 deg azimuth (towards Jupiter dusk) / -8.69056334 deg elevation (towards Jupiter S. Pole) offset from Jupiter-Sun vector, where the off-Sun angle is equal to 35 deg, effectively towards Juno PON. Resulting RA/Dec (deg) in J2000 (EME2000): 137.52375878 / 6.52863506 PJ27_MWRP34N9 orientation has +Z along +34.06333717 deg azimuth (towards Jupiter dusk) / -8.58350366 deg elevation (towards Jupiter S. Pole) offset from Jupiter-Sun vector for PJ27, where the off-Sun angle is 35 deg, effectively towards Juno PON. Resulting RA/Dec (deg) in J2000 (EME2000): 141.73479067 / 5.29836427 PJ28_MWRP34N8 orientation has +Z along +34.08544948 deg azimuth (towards Jupiter dusk) / -8.48522601 deg elevation (towards Jupiter S. Pole) offset from Jupiter-Sun vector for PJ28, where the off-Sun angle is 35 deg, effectively towards Juno PON. Resulting RA/Dec (deg) in J2000 (EME2000): 145.94077945 / 3.97316671 PJ29_MWRP34N8 orientation has +Z along +34.10233933 deg azimuth (towards Jupiter dusk) / -8.40971788 deg elevation (towards Jupiter S. Pole) offset from Jupiter-Sun vector for PJ29, where the off-Sun angle is 35 deg, effectively towards Juno PON. Resulting RA/Dec (deg) in J2000 (EME2000): 150.13784952 / 2.54726616 PJ30_MWRP34N8 orientation has +Z along +34.12515087 deg azimuth (towards Jupiter dusk) / -8.30606577 deg elevation (towards Jupiter S. Pole) offset from Jupiter-Sun vector for PJ30, where the off-Sun angle is 35 deg, effectively towards Juno PON. Resulting RA/Dec (deg) in J2000 (EME2000): 154.37079396 / 1.06616196 PJ31_MWRP34N8 orientation has +Z along +34.14701273 deg azimuth (towards Jupiter dusk) / -8.20547010 deg elevation (towards Jupiter S. Pole) offset from Jupiter-Sun vector for PJ31, where the off-Sun angle is 35 deg, effectively towards Juno PON. Resulting RA/Dec (deg) in J2000 (EME2000): 158.60175748 / -0.47997906 PJ32_MWRP34N8 orientation has +Z along +34.18565809 deg azimuth (towards Jupiter dusk) / -8.02339326 deg elevation (towards Jupiter S. Pole) offset from Jupiter-Sun vector for PJ32, where the off-Sun angle is 35 deg, effectively towards Juno PON. Resulting RA/Dec (deg) in J2000 (EME2000): 162.89900347 / -2.01783764 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 += 'MWRNON' PRIMARY += '-Z = JUNOORB' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'MWRPON' PRIMARY += '+Z = JUNOORB' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'MWRCROSSTRACK' PRIMARY += '+Z = JUPN' SECONDARY += '-X = TOSUN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ05_MWRNONTILT14' PRIMARY += '-Z = PJ05_JUNOORB14' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ09_MWRNONTILT35' PRIMARY += '+Z = PJ09_SUNOFF35' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ12_MWRN30P20' PRIMARY += '+Z = PJ12_SUNOFFN30P20' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ16_MWRN30P20' PRIMARY += '+Z = PJ16_SUNOFFN30P20' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ19_MWRCROSSTRACKSTILT10' PRIMARY += '+Z = PJ19_MWRXSTILT10' SECONDARY += '+X = TOSUN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ20_MWRN30P5' PRIMARY += '+Z = PJ20_SUNOFFN30P5' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ22_MWRN34P6' PRIMARY += '+Z = PJ22_SUNOFFN34P6' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ23_MWRP34N9' PRIMARY += '+Z = PJ23_SUNOFFP34N9' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ24_SUNOFFSETNEG59OPT' PRIMARY += '+Z = PJ24_SUNOFF59OPT' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ24_RMSUNOFFN5P0' PRIMARY += '+Z = PJ24_SUNOFFN5P0' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ25_MWRP34N9' PRIMARY += '+Z = PJ25_SUNOFFP34N9' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ26_MWRP34N9' PRIMARY += '+Z = PJ26_SUNOFFP34N9' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ27_MWRP34N9' PRIMARY += '+Z = PJ27_SUNOFFP34N9' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ28_MWRP34N8' PRIMARY += '+Z = PJ28_SUNOFFP34N8' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ29_MWRP34N8' PRIMARY += '+Z = PJ29_SUNOFFP34N8' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ30_MWRP34N8' PRIMARY += '+Z = PJ30_SUNOFFP34N8' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ31_MWRP34N8' PRIMARY += '+Z = PJ31_SUNOFFP34N8' SECONDARY += '+X = ECLIPN' BASE_FRAME += 'J2000' ORIENTATION_NAME += 'PJ32_MWRP34N8' PRIMARY += '+Z = PJ32_SUNOFFP34N8' 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' \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 TDB (Barycentric Dynamic Time). 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 += @2020-11-07/01:01:09.183 CK-61900STOP += @2020-11-07/06:03:12.822 \begintext ******************* PJ30 ****************** \begindata CK-61900ORIENTATION += 'PJ30_MWRP34N8 AT 2020-11-08/02:01:11.118' CK-61900START += @2020-11-07/06:08:12.822 CK-61900STOP += @2020-11-08/08:09:12.822 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2020-11-08/08:14:12.822 CK-61900STOP += @2020-12-30/01:58:46.876 \begintext ******************* PJ31 ****************** \begindata CK-61900ORIENTATION += 'PJ31_MWRP34N8 AT 2020-12-30/21:57:00.558' CK-61900START += @2020-12-30/02:03:46.876 CK-61900STOP += @2020-12-31/04:04:46.876 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2020-12-31/04:09:46.876 CK-61900STOP += @2021-02-20/21:54:05.841 \begintext ******************* PJ32 ****************** \begindata CK-61900ORIENTATION += 'PJ32_MWRP34N8 AT 2021-02-21/17:52:53.022' CK-61900START += @2021-02-20/21:59:05.841 CK-61900STOP += @2021-02-22/00:00:05.841 CK-61900ORIENTATION += 'EARTHPOINTED' CK-61900START += @2021-02-22/00:05:05.841 CK-61900STOP += @2021-04-14/13:01:09.186 \begintext Appendix 2: Information for Rotation About Spin Axis Segment ============================================================= ******************************************************************************** MSOPCK SETUP FILE: juno_sc_nom_201107_210414_study_OAA_35off_v02_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 11/07/20 01:00:00 04/14/21 13:00:00 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): 2020-11-07/01:01:09TDB 2021-04-14/13:01:09TDB 0 0 0 0 0 0.20943951023932 The following MSOPCK setup parameters were used to generate this segment: \begindata LSK_FILE_NAME = '../../SPICE/lsk/naif0012.tls' SCLK_FILE_NAME = '../../SPICE/sclk/JNO_SCLKSCET.00099.tsc' FRAMES_FILE_NAME = '../../SPICE/fk/juno_v12.tf' INTERNAL_FILE_NAME = 'JUNO REF SPIN ATTITUDE, 04/29/20' CK_TYPE = 2 CK_SEGMENT_ID = 'JUNO REF SPIN ATTITUDE, 04/29/20' 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 = 2020-04-29T22:20:44 START_TIME = 2020-11-07T00:59:59.817 STOP_TIME = 2021-04-14T12:59:59.814 ******************************************************************************** INTERPOLATION INTERVALS IN THE FILE SEGMENTS: ******************************************************************************** SEG.SUMMARY: ID -61000, COVERG: 2020-11-07T00:59:59.817 2021-04-14T12:59:59.814 -------------------------------------------------------------------------------- 2020-11-07T00:59:59.817 2021-04-14T12:59:59.814 ******************************************************************************** End of comments.