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Return to Venus of AKATSUKI

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Return to Venus of AKATSUKI Return to Venus of AKATSUKI Masato Nakamura (ISAS) AKATSUKI Project Team 1 Akatsuki project • Akatsuki was proposed in 2001 with strong support by international Venus science community and approved as an ISAS mission soon after the proposal. • Akatsuki and ESA’s Venus Express complement each other in Venus climate study. Various coordinated observations using the two spacecraft have been planned. • Participating scientists from US have been selected. • Akatsuki was launched in May 2010. • The Venus orbit insertion scheduled for December 2010 has failed. Now Akatsuki is orbiting the Sun. ISAS is examining the possibility of conducting Venus orbit insertion again several years later. Venus orbiter AKATSUKI • Science target : ‘Weather of Venus’ – Mechanism of ‘super-rotation’ – Structure of meridional circulation – Meso-scale processes – Formation of clouds – Lightning – Active volcanism, inhomogeneity of surface material • Mission life : More than 2 Earth years in Venus orbit 3D observations Akatsuki Temperature and H2SO4 vapor profiles (RS) Airglow （LAC） Stratosphere Sulfur dioxide 90 km （UVI） Cloud temperature （LIR） 65 km Clouds Lower clouds （IR1, IR2） Wind vectors 50 km Troposphere Carbon monooxide 35-50 km （IR2） Lightning （LAC） Surface Water vapor （IR1） Active volcanoes / Minerals （IR1） Spacecraft Configuration PLANET-C “Akatsuki” Spacecraft Box-shaped with Solar Array Paddles Shape and Orbital Maneuver Engine and Size (1.04m x 1.45m x 1.40m) 1μm Infrared Camera (IR1) 2μm Infrared Camera (IR2) Scientific Near Infrared (10μm)Camera (LIR) Instruments Ultra Violet Imager (UVI) Lightning and Airglow Camera (LAC) Ultra Stable Oscillator (USO) Elliptic Orbit about Venus Planned Periapsis Altitude : 550km Orbit Apoapsis Altitude : 80,000 km about Venus Orbital Period : 30 hours Orbital Inclination : 172 degrees Mission Life Two Earth years in the Venus orbit 518 kg (including 196 kg fuel) at Weight (wet) launch Power Supplied More than 500 W at Venus orbit by Solar Paddles at the end of the mission life 5 Akatsuki launch: May 21, 2010 Separation from H-IIA Integration Launch by H-IIA from Tanegashima Space Center What happened to Akatsuki at the Venus Orbit Insertion trial? ⑦10:26 ISAS and JPL found AKATSUKI REAL ⑤Dec. 7th Nominal case： 9:01:00JST OME stop Actual sequence 8:51:38JST OME stopped PLAN ⑥Occultaion end 09:12:03JST No telecommunication ②Attitude control for VOI 6th of Dec 07:50JST ④Occultation start ③OME started ①Time line started 08:50:43 7th of Dec. 08:49JST 5th Dec. Block Diagram of Propulsion System 高圧ガス Helium Gas Tank (P1) タンク (Ghe) FDV-1 P-1 P FLT-G Latching Valves HLV-1 HLV-2 Check Valve (CV-F) HLV-3 Regulator (P2) RG-1 RG-2 salt Check Valve (CV-O) P-2 formation P TP-1 GLV in vapor CV-F CV-O FDV-2 FDV-3 GLV 酸化剤タンク Fuel Tank (P3) 燃料タンク (MON3) Oxidizer Tank (P4) (N2H4) FDV-4 FDV-5 P P-3 P P-4 FLT-F FLT-O LV-F1 LV-F2 OLV-F OLV-O TP-2 TP-3 RCS thrusters TP-4 TP-5 18.1N x 8 T1 T4 T2 T3 OME (476.1N) 2.3N x 4 AB1AB3AT2AT4 AB2AB4 AT1AT3 OME Profile of Pressures of Propulsion System 1.6 22.6 Regulated 1.5 Pressure (P2) 22.4 1.4 P1) （ Oxidizer Tank 22.2 ] 1.3 Pressure (P4) MPa [ P2, P3, P4) 22 （ 1.2 ] Fuel Tank MPa 1.1 21.8 [ Pressure (P3) less 1 pressurized 21.6 0.9 Helium Gas Tank 調圧圧力(P2) Pressure (P1) 21.4 0.8 燃料タンク圧力(P3) 酸化剤タンク圧力(P4) 21.2 Ｔａｎｋ Ｐｒｅｓｓｕｒｅ 0.7 ガスタンク圧力(P1) Ｈｅｌｉｕｍ Ｇａｓ Ｐｒｅｓｓｕｒｅ 0.6 21 -20 30 80 130 180 230 280 330 380 Time from OME (Orbital Maneuver Engine) Ignition (sec) Orbital Maneuver Engine (OME) Burn on the ground simulating VOI-1 O/F Start condition VOI-1 failure Oxidizer tank pressure (MPa) Ground test Fuel tank pressure (MPa) Gas pressure to push oxidizer was properly controlled • Gas pressure to push the fuel was decreased → O/F increased → Temperature in the combuson chamber increased and OME was Destroyed Possible Scenario of VOI-1 Failure - AOCS (Attitude and Orbit Control System) sent an abort command due to the sudden attitude disturbance at 158 sec after VOI-1 start - OME (Orbital Maneuver Engine) induced unexpectedly large side forces at 152 sec - Fuel was less pressurized and mixture ratio of fuel/oxidizer was abnormal - Gas flow was obstructed at a check valve of fuel tank, which could be caused by (1) Salt formation in fuel/oxidizer vapor (2) Contamination in the check valve After ground test operation 11 AKATSUKI’s orbit in present Failure of VOI（Dec 7, 2010) 1/1 Akatsuki orbit 2/1 Period : 203 days 1/1 1/1 3/1 2/1 Earth orbit 2/1 4/1 Sun 3/1 4/1 AKATSUKI 3/1 Venus orbit will meet 4/1 Period : 225 days Venus in 5-6 years Perihelion [A 12 （April 17, U]2011 ） Orbit maneuver plans trajectory to meet Venus xy plane: 金星公転面 1 DV 3 0.8 (orbital correction maneuvers) SWB1 0.6 17 Mar 2015 Akatsuki 0.4 DV6 0.2 Sun 0 Y [AU] ‐0.2 TM1 DV4, 5 Test Maneuver‐ 0.41 & 2 TM2 Perihelion DV1 ‐ 3 (inclination maneuvers) ‐0.6 7 & 14 Sep 2011 Venus DV 1 & 2 (phase correction maneuvers) ‐0.8 31 Oct 2011 – 11 Nov 2011 ‐1 ‐1 ‐0.8 ‐0.6 ‐0.4 ‐0.2 0 0.2 0.4 0.6 0.8 1 X [AU] Possible Strategies of Venus Insertion Current Orbit (Period : 203 days) +50 m/s Venus Encounter Orbit-1 Jan.27, 2017 at first perihelion (Period : 204 days) (11:10) -70 m/s Venus Encounter Orbit-2 Jun.21, 2016 at first perihelion (Period : 202 days) (10:9) -300 m/s Venus Encounter Orbit-3 Dec.02, 2015 at first perihelion (Period : 200 days) (9:8) Venus Encounter Direct Capture(insertion) Venus Swing-by Venus Insertion Return to Venus? • Most of the fuel still remains. • AKATSUKI will encounter Venus in 2015 - 2017 depending on the orbit correction plan. • The condition of the propulsion system is unclear. JAXA is examining various scenarios of second Venus orbit insertion depending on the conditions of the check valve and the main thruster. • Thermal condition during the extended cruise phase is another problem. Thermal condition in the next 6 years Akatsuki perihelion (0.6AU) 3655W/m2 Perihelion Venus orbit (0.7AU) 2 (April 17) 2649W/m Solar flux (W/m2) VOI (Dec 7) Earth orbit 1400W/m2 Launch (May 21) Date Thermal condition • The temperatures of the instruments exposed to space are gradually increasing as the spacecraft approaching the perihelion at 0.6 AU. We tried to minimize the number of instruments whose temperatures exceed the allowed upper limits by letting a certain side of the spacecraft face to the sun. • After passing the perihelion every instruments are working normally. • The degradation of the reflectivity of the outer film (MLI) during the extended cruise may influence the temperature tendency. Laboratory tests to evaluate the degradation are ongoing. Venus seen from Akatsuki 2 days after the failure of Venus orbit insertion 365 nm (UVI) 0.9 µm (IR1) 10 µm (LIR) Distance : 600,000 km Venus thermal Image taken by LIR (Corrected) December 9th (09:00JST) 600,000km away from Venus Improvement of the spatial resolution of the LIR 10µm image by using multiple frames taken under varying spacecraft attitude. -80 -60 -40 [℃] 19 Radio occultation of solar corona (June 2011) X-band radio wave Akatsuki Usuda Deep Space Center Angular position of Akatsuki relative to Sun as seen from Earth June 25 Positions for all days during Jun 6-Jul 8 Positions for observation days June 6 Sun Sun Already conducted Preliminary results for 6-21 solar radii Kolmogorov (f -8/3) Amplitude spectrum Phase spectrum • Amplitude Solar wind velocity, Power-law of turbulence • Phase Density fluctuation, Power-law of turbulence Simultaneous observations with JAXA’s solar observation satellite ‘Hinode’ are planned for 1.5 - 2.3 solar radii. Road map to Return to Venus We will conduct crical operaon for PLANET‐C Venus encounter • Test maneuvers of OME will be performed on 7 Sep (TM1) and 14 Sep (TM2) 2011. – TM1 (2 sec): to see if the disturbance torque is much bigger than expected. (e.g. 50Nm) Transferring to Safe Hold Mode should be avoided at TM1. – TM2 (20 or more sec): to esmate the disturbance torque and atude control algorithm. Transferring to Safe Hold Mode is acceptable. – In case when OME failures, mulple Venus swing‐by’s are our opon. • Orbit maneuvers (DV1 & 2) will be performed in the end of October to the beginning of November 2011. • Venus encounter will be scheduled in November 2015 with mulple powered swing‐by’s. • Venus Orbit Inseron (VOIR1) will be achieved in 2015 in the shortest case. The longest case will be in 2018. .
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