Tracking Station mtg Feb 19 20

Tracking Station mtg, , 　Feb. 19 & 20, 2006, OAM Madrid VSOP-2　project　Update VSOP-2 　　　Project status 　　　Spacecraft and instruments 　　　　　 Hisashi Hirabayashi /JAXA A ct 2

VSOP-2 Project Budget request was approved Dec. 2006 Internal Reviews; ISAS System Definition Review March 19, or 26. JAXA Project Review March, or April Project formal start April 1, 2007 (FY 2007 start day) Project Manager Prof. Saito Project Scientist Prof. Tsuboi (transfer from Nobeyama R. O. Director after Hirax’s retirement ) Meetings; VSOP Lessons Learned mtg in Hakone April org. ed by YH/HH/LIG VSOP-2 symposium in Sagamihara Dec. 2007 Satellite ETS-VIII (now Kiku-VIII) launched and 2 LDRs were successfully deployed (Dec, 25 -26, 2006). Launch in Jan. -Feb. 2012 is current plan, but ? Still Uncertainty in Launcher VLBI-Link 40 GHz up and 37 GHz down link, we propose.

VLBI Space Observatory Programme HALCA and VSOP (1997 - 2006) Highly Advanced Laboratory for Communications and Astronomy 1. 6 GHz (18 cm) Resolution of 5 GHz (6 cm) 360 μarcseconds 　 at λ= 6 cm Launch: ISAS M-V rocket Feb. 12, 1997 30, 000 km 10 years anniversary, a week ago ! Time flies as rockets do.

HALCA/VSOP project started in April 1989 HALCA Launch in Feb. 1997 HALCA last command 　　 November 30, 2006 (３２１３　days after launch）　　　　　 HALCA/VSOP was a 17 years project, and terminated in March 2006. Lessons Learned mtg in Hakone, April l 6, 17, 2007 　

ISAS Astronomy satellites Series Astro-E launch failure 2002 ? Astro-E II = Suzaku X-ray 2005 Astro-F = Akari IR Solar-B = Hinode Sun 2006 2007 here is a long gap. Astro-G = ? ? ? Ne. XT Radio 2012 X-ray last usage of M-V rocket

VSOP-2 spacecraft – Mass (wet) 910 Kg – Power 1, 800 W In-Orbit Configuration 7 modules Solar Paddle Launch Configuration in M-V rocket Sub-reflector with 3 -dim adjust. Feed/LNA 9 m offset Cassegrain Antenna with Modular Structure Link Antenna Main-Reflector with 2 -dim adjust

Modular antenna structure for VSOP-2 • modular antenna structure deployment mechanism and back-structure same as ETS-VIII but with new antenna surface design (Study since 2000 with budgets) ½ scale 7 modules successful deployment test in 2006 Oct. by Ariane piggyback ETS-VIII(Kiku-VIII) was Launched in Dec. 2006, and was successfully Deployed as below.

VLBI Link system High Gain Antenna Diameter: 80 cm Astro-G Proposed frequency Phase Transfer Uplink Frequency 40 GHz No Modulation TX-Power 10 W VLBI Data Downlink Frequency 37 -38 GHz Bit Rate 1 Gbps Modulation QPSK TX-Power 20 W Ground Link Station Diameter >10 m Data Storage H Maser Phase Comparison Data Storage Capacity 4 TB / 8 hours

Phase-referencing observation Study • Rapid switching between target and phase reference sources – Increase sensitivity – Astrometric studies • Requirements – 3 degeree separation within 1 min cycle High torque actuator : CMG (Control Moment Gyro) 　 with 4 Reaction Wheels Orbit determination accuracy: < 5 cm with GPS + SLR Problems; Expensive CMGs OD accuracy cannot be enough Consideration or Decision needed ? ? Control Momentum Gyro(Honeywell)

Solar-B, Solar X-ray/Opt/UV Observatory, was renamed HINODE which means “sunrise”. It was launched near the sunrise into sun-synchronous orbit. US/European contribution to HINODE On-board Instruments (US, UK) Tracking support (ESA) ＨＩＮＯＤＥ　ｌａｕｎｃｈ by M-V-7 (the last M-V launch) Ｓｅｐｔｅｍｂｅｒ　２３，　２００６ Uncertainties for Astro-G launcher H-IIA other ? Orbit ? in case of shared launch

Astro-G Tracking Meeting, Feb, 2007, OAM Madrid VSOP-2 Mission, Concluding Remarks 2 nd Generation space-VLBI mission VSOP-2 is now funded for Astro-G satellite launch in Feb. 2012, And the project will formally start in April 2007. (Phase-A to Phase-B) Design study and mission planning are in progress, Group is being established in Japan. t VS P-2 O bi Or

2006 US/Japan meeting, Socorro, Feb. EVN Directors mtg, Firenze, May Europe/Japan mtg, JIVE, June 　COSPAR GA, Beijin, July IAU GA, Prague, Aug. 　 EVN symp. Torun, Sept. 　Tracking meeting, Pasadena, Oct. Nov. EVN Directors mtg, Bonn, Nov. 2007 Lessons Learned mtg, April 18, 19, Japan (? ) Europe/US/Japan mtg, May, Bonn VSOP-2 symposium Dec. 3 -6. ISAS VSOP-2 Selected Contractor Selection (Now) Budget Announciation (Dec. 2006) ISAS Mission Def. Review JAXA Review VSOP-2 Project start (April 2007)

5 Stations Tracking Network for HALCA VSOP-2 tracking station(s) in the European longitude Yebes South Africa ? 10 m 64 m 13 m 40 m HALCA-Usuda first fringes (via 10 m) (64 m) at 1. 6 GHz 43 GHz Space- Ground baseline at Yebes This slide was shown to Dr. Southwood and ESA members more than once.

VLBI Two-Way Link Need to make basic design soon so that each partner can understand explain to funding agencies. Need to establish an international Study team by interested (or approved) parties. VSOP had 5 stations network with 3 different design; Usuda (ISAS) 1 DSN (JPL) 3 GB(NRAO) 1 with compatibility test One group to design one scheme is important.

Common design and delivery (draft thought) Make common basic design Review at April mtg at Sagamihara Common frequencies with NTS engineers’ presence with RFI consideration with some more details RF part　feed (antenna dependent) polarizer / diplexer IF and LO frequency chain and O/E, E/O (station dependent) Demodulator/ Modulator module exist ? (JPL? ) Japanese FPGA-based design ? Doppler compensation (unified open loop !) Time/ phase correction measurement circuitry to be confirmed Control and Logging Computer and Software which cmputer ? language? Who can work, or deliver in what part later Station Prarticipation how many spare parts ?