THEMIS FRRSC - 1 KSC, Feb 12, 2007 SPACECRAFT OVERVIEW/STATUS Peter R Harvey THEMIS Project Manager.

THEMIS FRR SC - 1 KSC, Feb 12, 2007

SPACECRAFT OVERVIEW/STATUS

Peter R HarveyTHEMIS Project Manager


• Mission Overview• Flight Systems Processing• Ground Systems• Reviews• Summary

Agenda


Probe conjunctions along Sun-Earth line recur once per 4 days over North America.

Ground based observatories completely cover North American sector; can

determine auroral breakup within 1-5s …

… while THEMIS’s space-based probes determine onset of Current Disruption and

Reconnection each within <10s.

: Ground Based Observatory

Mission Science


LaunchVehicle: Delta II, Eastern RangeApogee: 91845.2 km ± 9567 kmPerigee: 435 km ± 10 km (500 km ± 7 km on or after

3/1/2007)Inclination: 16.0 deg ± 0.5 degDate: February 15, 2007

Space SegmentSpacecraft: 5 Spinning Probes with Fuel for Orbit & Attitude

AdjustInstruments: 3-Axis Electric Field, Magnetic Field

3-D Ion & Electron Particle DetectorsSpin Rate: 20 RPMOrbit Period(s): 1, 2 and 4 daysOrientation: Ecliptic Normal

Ground SegmentObservatories: 20 Northern with All Sky Imagers and

MagnetometersControl Facilities: Mission and Science Operations Centers

OperationsPhases: L&EO, Cruise, Ascent, Campaigns, De-orbitLifetime: 2.3 years

Mission Summary


Instrument Configuration

IDPU: Instrument Data Processor UnitSPB : Spin Plane Booms (4x)AXB : Axial Booms (2x)SST : Solid State Telescope (2x)ESA : Electrostatic Analyzer FGM : Fluxgate MagnetometerSCM : Search Coil Magnetometer


Fuel Tank

ESA

EFI SPB

Thruster T1

EFI Axial Booms (2, Stowed)

BatteryBAU

Repress Tank

Miniature Sun Sensor

Transponder

Thruster T2

IDPU

Fuel Tank

Antenna

EFI SPB

EFI SPB

Thruster A1

Thruster A2

AEB

Gyros

Probe Configuration


Standard Delta 10 ft. Fairing Static Envelope

3712 PAF

Probe Carrier Assembly (PCA = 5 Probes + Probe Carrier) on L/V

Probe Carrier Assembly (PCA = 5 Probes + Probe Carrier) on L/V

THEMIS Launch Configuration

THEMIS Launch Configuration

Probe Carrier Assembly (PCA) on Delta 3rd StageProbe Carrier Assembly (PCA) on Delta 3rd Stage

Launch Configuration

Dedicated launch accommodated within standard Delta 7925-10 vehicle configuration and services

10’ Composite Fairing required to accommodate five Probes on the Probe Carrier in the “Wedding Cake” configuration

PC stays attached to Delta 3rd stage after probe dispense

Each probe dispense from the PCA is coordinated with but independent of the other probes

No single probe anomaly precludes dispense of remaining probes

Star 48 3rd Stage


Environments

Thermal Vacuum

Acoustics

Spin Balance

EMC

VibrationMagnetic

s


Probe Processing

Bolt Cutter Installation

Performance Tests

Solar Array Illumination

Delivery to ASO


Probe Fueling

Vibration

Thermal Vacuum

Acoustics Spin Balance

Storage

Dry Weigh & Pressurize Fueling


PCA Processing

Vibration

Acoustics Spin Balance

Storage

SSS Installation

Ready for Probes

Final checks

Spin Balance

PCA Integration

Fairing Installation


Ground System Diagram

Ground System Elements•Ground Stations

•Ground Network

•Space Network

•Mission Operations Center

•Science Operations Center

•Flight Dynamics Center

Including•Mission Design

•Orbit & Attitude Determination

•Maneuver Planning

•Limit Detection and Notification

•Network Security


Mission Operations Center

BGS Antenna, Equipment Racks and FOT Workstations at the Mission Operations Center


Ground Stations

Ground StationStation

DesignatorFigure of

MeritLocation Function

Berkeley, CA BGS 11-m 24.0 dB/K37.879° N 122.243° W

Primary TLM/CMD/TRK

Wallops Island, VA WGS 11-m 23.0 dB/K37.925° N75.476° W

Secondary TLM/CMD/TRK

Merritt Island, FL MILA 9-m 1/2 21.6 dB/K28.508° N80.693° W


Santiago, Chile AGO 9-m 21.6 dB/K33.151° S70.668° W


Hartebeesthoek, SA HBK 10-m 20.4 dB/K25.883° S27.708° E


Mission Supported by 5 Ground Stations• Ground Stations: BGS, WGS, MILA, AGO, HBK• GN, SN and FDF Support Documented in PSLA• All Stations Have Successfully Flowed Data with MOC


LEO Acquistion

LEO AcquisitionMultiple Ground Assets Have Good View Following LaunchProbe Attitude Around 1:30 MET is Poor for Telemetry Probes Contacted at 4Kbps for 5 Minutes each from 1:20 to 1:40


Mission Profile


LEO Early Orbit

Early Orbit Activities• TDRSS Pass to Observe Separation at T+73 min• Round-robin Contacts

– Starting at T+81min, Each Probe Will Be Contacted for 5 Mins– Expected Battery SOC to Remain > 87%

• Initial Orbit and Attitude Determination– Record and Process Two-way Doppler Data– Perform Attitude Determination in Real-time– Both UCB and GSFC FDF Function in Parallel

• Round-Robin Checkout of Key Systems on Each Probe– Reaction Control System Readiness– Attitude Sensors Functionality

• Perform Attitude Maneuver to Ecliptic Normal• Systematic Instrument Power-up and Check-out

– Leads to Decision of Probe Orbit Placement in Appx 26 Days


Ground Based Observatories Ground Based Observatories

• UCB has Delivered All 20 GBO (GMAG and ASI) units• 19 Have Been Installed, 1 Needs Repair• Automatic Data Collection and Archiving in Progress• Remote Commanding and Diagnostics Working • Expect to be Fully Functional at Winter 2008

Courtesy H.Frey, UCB

GeographicLongitude 324°

Geographic Longitude 195°

GeomagneticNorth Pole

GeographicNorth Pole


IIRT RFA Status

IIRT Performed 27 Formal Reviews of THEMIS

IIRT Issued 308 Requests for Action

Project Completed all 308

IIRT Concurred on all 308

Final Two Closed since MRR• RCS Proof

• Launch Window Analysis


Reviews Ahead

Start Event Description Status1/5/2007 MRR Mission Readiness Review at GPMC Complete

1/12/2007 LVRR Launch Vehicle Readiness Review Complete1/19/2007 SMSR Systems and Safety Mission Assurance RComplete1/23/2007 MRB Mission Readiness Review Complete2/1/2007 LSRR Launch Site Readiness Review Complete

2/12/2007 FRR Flight Readiness Review In Progress2/14/2007 LRR Launch Readiness Review


Summary

Issues Bolt Cutter Taping – Closed P1115 Connector Demated – Closed PCA-3rd Stage CG Offset – Closed

Summary Status Probes and Probe Carrier are Flight Ready Mission Operations is Complete Launch Team and Operations Teams are Ready

Readiness Statement THEMIS is Ready to Continue Processing for Launch

THEMIS FRRSC - 1 KSC, Feb 12, 2007 SPACECRAFT OVERVIEW/STATUS Peter R Harvey THEMIS Project Manager.

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