Employment of AGIS for Nano-Jasmine - Scope of study Mission details Disparity to Gaia Investigation using AgisLab software package Preliminary examination – Transits Projection Revision of AgisLab for Nano-Jasmine Standard Errors for Astrometric Parameters Potential Convergence of Agis Solution for NJ

Mission Specifications – Nano-Jasmine Pre-cursor to JASMINE (2020) and Small JASMINE (2015) Japanese Astrometry Satellite Mission for Infrared Exploration Respective accuracies: - Nano-Jasmine : 1mas, 5cm diam - Small Jasmine : 10 u-arsec, 30cm diam - JASMINE : 10 u-arcsec, > 80cm diam Due for launch in July of 2010 (Gaia:2011) JAXA, ISSL, University of Tokyo, University of Kyoto

Nano-Jasmine Satellite Cubic in shape: 50 x 50 x 50 cm Being launched on Cyclone-4 rocket in Brazil (Alcantera) Adopts the Ritchey-Chretien optical system. Telescope has a diameter of 5cm with a beam combiner placed in front of the primary mirror. Observing in visible spectrum

Hipparcos vs Nano-Jasmine Similar objectives to Hipparcos ( 1-2 mas) - Nano-Jasmine : 1 mas Measure annual parallaxes of bright stars (7 mag) with an accuracy >1mas after two years of operation.

Disparity to Gaia Orbit – Sun-synchronous (unlike Lissajous Orbit of Gaia) Shorter mission length: 2 years Basic angle of 99.5 degrees One single telescope with two fields of view separated by basic angle created using a mirror system ; Ritchey-Chretien optics system Hence, different geometry

Sun-synchronous Orbit Orbital plane of the satellite rotates in inertial space with the angular velocity of the earth’s orbit around the sun. Approx 0.9856 deg/day eastward to keep in sync with this orbit Object allowed to be in a “fixed" position in space rather than an orbit in which its relative position changes continuously.

Ritchey-Chretien Optical System

Ritchey-Chretien Optical System Telescope has a diameter of 5 cm with a beam combiner placed in front of the primary mirror. Focal length of 167cm Reflecting optics and three flat mirrors (the light path after the 2nd mirror is folded by the plane mirrors). The telescope also has a beam combiner for global field astrometry whose basic angle is 99.5º, so that the apparent relative distribution of stars can be resolved into a satellite's motion and an actual distribution of stars. Deformation of optical components - Structure and optics = same material. All mirrors and their structural supports: aluminum alloys using ultra-precise machinery and tools.

Flexibility of AgisLab Creation of a GPDB equivalent for Nano-Jasmine Extraction of Gaia-specific elements Implementations for both missions for Orbit, Geometry and Attitude Ability to preferentially select mission properties-files

Number of transits image for N-J and Gaia Nano-Jasmine: One single CCD Average value output : 96.751 Gaia : 106-CCD array with SMs and Photometers Average value: 88 (*9 = 792)

Desired Accuracies Levels of accuracies as outlined in the mission specification document: Position: Alpha: <= 10 milli-arcsecond Delta: <= 10 milli-arcseconds Proper Motion: Alpha_Star: <= 4 milli-arcseconds per year Delta_Star: <= 4 milli-arcseconds per year Parallax: <= 10 milli-arseconds

Error Plots for Astrometric Parameters } Position: Alpha (α0) and Delta(δ0) Parallax (π0) Units: Position and Parallax: μ-arcsec Proper Motion: μ-arcsec/day Proper Motion: Mu_alpha (μα) and Mu_delta (μδ)

Values calculated from the graphs: Position : alpha + 5.43 m-arcsec : delta + 4.40 m-arcsec Parallax : + 2.3 m-arcsec Proper Motion : mu_Alpha + 9.37 u-arcsec/day : mu_Delta + 7.49 u-arcsec/day Latter results for proper motion are given in unit of u-arcsec/day. Simple conversion calculation gives an average value of ~ 3.075 m-arcsec per year - in accordance with the desired value of <= 4 m-arcsec per year.

Source-Attitude Update Results Convergence Plot - Update settings: 100 iterations 100,000 sources generated – full mission solution True observations (no noise)

Source-Attitude Update Results Convergence Plot Update settings: 100 iterations 100,000 sources generated – full mission solution Noisy observations

Agis for JASMINE itself (Small-Jasmine too?) Same mission duration CCD-array similar (14 x 7) , Gaia (13x7 roughly) Parallaxes, positions with accuracy of 10 u-arcsec Proper motions with the accuracy of 10 u-arcsec/year For stars brighter than z » 14 mag JASMINE: Infrared, GAIA: Visible Focal length 50m (Gaia:35m) Observe about one hundred million stars belonging to the disc and bulge component of our Galaxy, which are hidden by the interstellar dust extinction in optical bands (Perhaps in Gaia) Both in Lissajous Orbit

Error Comparison Maps Median values for the ICRS in AGIS plots Comparisons between different stages of the Iterative Solution Based on noisy solutions – both AL and AC directions

Comparison of Standard Error plots estimates with Final Converged Solution plot The orange regions of the estimate plot (error 3.2E3) – match the green regions in final iteration map (4.0E3) Green regions of the estimate plot (1E3 – 1.7E3) – consistent with corresponding values of 5E2 to 2E3 exhibited in the iteration map. Highly satisfactory result. Can also be performed for other astrometric parameters

Next Stages Establish an equivalent to the IDT and First-Look as part of the wider tessellation scheme adopted for the JAXA mission

Thank you Questions?