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# Parameters
mk_ops_id = "juice_ops_v440_20240109_001"
mk_plan_id = "juice_plan_v440_20240109_001"
report_days = 15

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JUICE Cruise Report for `juice_ops_v440_20240109_001`¶

Abstract¶

The JUICE cruise trajectory report provides an overview of geometrical quantities and parameters of interest for a quick assessment of the current status of the JUICE cruise from the perspective of the JUICE Science Operations Center and to support the cruise activities of the instrument teams. The report is based on a given version of the Operational (ops) and Planning (plan) SPICE meta-kernels. Previous versions of the reports can be accessed from this link: https://juicesoc.esac.esa.int/cruise_reports

Cruise Geometry Plots for 2023-12-19T23:59:30 - 2024-01-03T23:59:30¶

The following geometry plots are provided for the observed period:

S/C Attitude Euler Angle Deviation in between the Planned and Measured attitude (in J2000)
S/C Attitude Angular Deviation in between the Planned and Measured attitude (Rotation around the resuling axis of the S/C rotation matrix in J2000)
S/C +Y axis Right Ascension and Declination in ECLIPJ2000 from the Measured attitude (contextualizes the S/C flips)
S/C to Sun angle with respect to the S/C +X Panel (including illumination warnings)
S/C to Sun angle with respect to the S/C +Z Panel (including illumination warnings)

These plots include both the Planned Attitude (as provided by Flight Dynamics in the ATTC Cruise Attitude Ephemeris Messages) and the Measured Attitude (the as-flown or exectued attitude extracted from the Housekeeping telemetry of the S/C).

The geometry plots include the following Flight Dynamics events in the background as orange intervals:

FLP Time periods when a flip to pass attitude happens
FLO Time periods when a flip to out-of-pass attitude happens
IXP Time periods when the sun illuminates the SC on the +X face
HGA Coverage period of the high gain antenna (HGA)
MGA Intended coverage period of the medium gain antenna (MGA)
WOL Period of a wheel off-loading (WOL) slot.
OMA Period of an orbit control manoeuvre (OCM) slot using the chemical propulsion system.

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The coverage of these plots is determined by the end time of the latest Measured (as-flown) attitude CK Kernel from the S/C Housekeeping telemetry (2024-01-03T23:59:30) and its start time is set to 15 days before (2023-12-19T23:59:30).

Cruise Flybys¶

The following section includes information for all the Cruise flybys. The flybys are summarized hereunder:

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LIST NAMES	TIME UTC	ALTITUDE [km]	SSC LON [deg]	SSC LAT [deg]	SSC PHASE [deg]	SSC LOCTIME [hours]
MOON_FB	2024-08-19T21:15:55	755.22	106.46	-12.41	110.26	19.37
EARTH_FB	2024-08-20T21:57:12	6807.09	162.87	24.03	47.61	8.75
VENUS_FB	2025-08-31T06:29:12	5081.24	357.15	-0.67	54.50	8.37
EARTH_FB	2026-09-28T11:52:00	8641.18	81.04	-22.05	81.13	17.42
EARTH_FB	2029-01-17T18:29:03	4643.31	25.15	16.23	123.00	19.98

In order to understand the applicable attitude for the flybys (SPICE CK) see the section SPICE Kernels Coverage of this report.

For periods were the attitude is not provided by predicted (juice_sc_attc*) or measured (juice_sc_meas*) CK kernels, the attitude implemented is the S/C SOC default attitude (juice_sc_crema_*_baseline*).

Please remember that this is the SOC prediction that does not correspond to the operational prediction that will be provided by Flight Dynamics and distributed as a SPICE Kernel by the SOC when the time comes.

The baseline attitude covers the hot/very hot cruise phase and is defined by:

-Xsc is pointed at the sun
The earth is in the Xsc/Zsc plane
The earth is kept on the +Zsc side

With this attitude definition before the solar conjunction +Ysc points towards the ecliptic south, while after the solar conjunction, +Ysc will point towards the ecliptic north. This is reflected in the baseline attitude.

The baseline attitude does not include the S/C daily flips and simply keeps the beforementioned attitude but for LEGA we force the most favorable polarity for the Moon and Earth flybys to have an intersection of the S/C +Z axis with the Moon and with the earth. The timeline for that period is as follows:

2024-08-18T21:16:11 – Switch to South Polarity
2024-08-19T21:16:11 – Moon CA with South Polarity
2024-08-20T12:00:00 – Switch to North Polarity
2024-08-20T21:57:27 – Earth CA with North Polarity
2024-08-21T21:35:52 – Switch to South Polarity

Cruise Flybys geometry¶

For each flyby a map projection is provided with the following geometrical quantities:

Groundtrack with Altitude [km]
S/C +Z axis target intersection with Sun incidence angle [deg]

In addition, the following geometrical quantites are shown:

Altitude [km]
S/C +Z axis nadir offset [deg]
Phase Angle at groundtrack [deg]
Groundtrack velocity [km/s]

Please note that in case the +Z axis of the S/C does not intersect the target (due to the SOC default attitude) it will not be shown in the map projection.

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SPICE Kernels Coverage¶

The coverage of the SPICE kernels that correspond to the meta-kernel are provided hereunder. Note that the priority of the applicable attitude is ordered from bottom to top, meaning that the bottom CK is applied.

The coverage difference in between the current ORBC and ATTC files and the ones from the previous version of the meta-kernel are provided hereunder for convenience:

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FILE	START TIME UTC	STOP UTC TIME
juice_orbc_000054_230414_310721_v01.bsp	2023-04-14T12:42:17.657	2031-07-21T06:03:08.151
juice_orbc_000053_230414_310721_v01.bsp	2023-04-14T12:42:17.657	2031-07-21T06:03:07.866
juice_sc_attc_000054_230414_240301_v01.bc	2023-04-14T12:42:18.000	2024-03-01T00:00:00.000
juice_sc_attc_000053_230414_240128_v01.bc	2023-04-14T12:42:18.000	2024-01-28T00:00:00.000

The differences of the flybys in between the current and previous ORBC files are provided hereunder for convenience:

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