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V.E.ZHAROV 1 , A.E.RODIN 2 , I.A.GERASIMOV 1 , Yu.P.ILYASOV 2 , K.V.KUIMOV 1

International Conference on RadioAstron Mission November 2003, Moscow ASTROMETRIC GOALS OF THE RADIOASTRON MISSION. V.E.ZHAROV 1 , A.E.RODIN 2 , I.A.GERASIMOV 1 , Yu.P.ILYASOV 2 , K.V.KUIMOV 1 1 Sternberg State Astronomical Institute, Russia

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V.E.ZHAROV 1 , A.E.RODIN 2 , I.A.GERASIMOV 1 , Yu.P.ILYASOV 2 , K.V.KUIMOV 1

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  1. International Conference on RadioAstron MissionNovember 2003, MoscowASTROMETRIC GOALS OF THE RADIOASTRON MISSION V.E.ZHAROV1, A.E.RODIN2 , I.A.GERASIMOV1, Yu.P.ILYASOV2, K.V.KUIMOV1 1 Sternberg State Astronomical Institute, Russia 2 Puschino Radio Astronomical Observatory of Lebedev Physical Institute, Russia

  2. RADIOASTRON MISSION Orbital parameters • Orbital period p = 9.5 days • Semi-major axis a = 189 000 km • Eccentricity e = 0.853 • Perigee height H = 2000 km • Optimized launch date is March 15, 2006.

  3. The fringe sizes (in micro arc seconds) for the apogee

  4. Main scientific goals of the mission Astrophysics problems: • Study of radio galaxies, quasars, black holes, neutron stars with very high angular resolution; • cosmological evolution of compact extragalactic radio sources; • determination of fundamental cosmological parameters and study of gravitational lenses and the nature of dark matter. Astrometry problems: • Precise astrometry on level of several microarcseconds, determinations of the distances to pulsars as well as evaluations of their velocities by the measurements of parallax and proper motion; • link of kinematical and dynamical celestial reference frames; • measurements of secular aberration (motion of the Solar system in Galaxy); • search of the weak microlensing events – study of apparent motions of compact extragalactic radio sources; • direct measurements of distances using spherical wave front.

  5. Modern and future radio and optical catalogsRadio Optical

  6. Defining sources for improved ICRF and its distributionS/N=10 Smin~ 30 mJy • Defining sources with S>1 Ju S/N>30 st300 ps • Each source will be observed more than 100 times • Uncertainty of coordinate will be < 10 mas

  7. Weak Microlensing • Sazhin M.V., Zharov V.E., et al., Microarcsecond instability of the celestial reference frame. Monthly Notices of Roy. Astron. Soc., 300, p. 287-291 (1998)

  8. Pulsar list B0329+5403h 32 m 59.3816s±0.0005s 54o 34 ' 43.486 ' '±0.004 ' ' B0355+5403h 58m 53.713s±0.003s 54o13' 13.75 ' ' ±0.1' ' B0950+0809h 53m 09 .30s ±0.01s 07o55' 36.154 ' ‘±0.07 ' ' B1933+1619h 35m 47.824s±0.006s 16o 16 ' 40.07' ' ±0.27' ' B2021+51 20h 22m 49 .866s±0.005s 51o54 ' 50.302 ' ' ±0.01' ' Eulerian angles Link of the celestial frames DE200 and ICRFby pulsar positions VLBI Timing B0329+54 (Rodin, Sekido, 2000) (Downs, Reichly, 1983) B1257+12 (Bartel, Nunes, 1996) (Wolszczan, 1999) B1937+21 (Bartel, et.al, 1996) (Kaspi, et. al, 1994) B2021+51 (Campbell, et.al, 1996) (Downs, Reichly, 1983) Eulerian angles (mas) from DE200 to ICRF Finger, Folkner, Folkner et al., Rodin, Sekido, 1992 1994 2001 LLR & VLBI LLR & VLBI Pulsar VLBI & timing (TDA Progr. Report (A&A, 287, (AP–RASC Conf. Digest, 42–109, JPL, CA) p. 279–289) Chuo Univ., Tokyo, p.388) Ax 1 ± 3 – 2 ± 2 – 4 ± 2 Ay –10 ± 3–12 ± 3 –13 ± 2 Az – 4 ± 5 – 6 ± 3 –17 ± 6 List of reference pulsars

  9. Secular aberration • Solar system velocity V= 220 km/s, orbit radius R= 8,5 kpc maximum secular aberration = 2.5 min of arc • Annual change of the direction of the Solar system velocity = 50 mas (secular aberration per year = 4 mas )

  10. Name R.A. Dec. Gal. b Gal. l 1954+513 D 19 55 42.738273 51 31 48.54623 11.7568385.29847 2005+642 O 20 6 17.694616 64 24 45.41805 16.73457 97.64550 2021+614 O 20 22 6.681695 61 36 58.80479 13.77531 96.08284 2030+547 D 20 31 47.958562 54 55 3.14060 8.98830 91.12945 2037+511 D 20 38 37.034755 51 19 12.66269 6.04010 88.80853 2100+468 C 21 2 17.056050 47 2 16.25468 0.33862 87.94161 2200+420 O 22 2 43.291381 42 16 39.97998 -10.44116 92.58958 2201+315 O 22 3 14.975796 31 45 38.27004 -18.77888 85.95683 2214+350 C 22 16 20.009936 35 18 14.18072 -17.62088 90.50210 0809-493 C 08 11 8.802530 -49 29 43.50928 -8.60913 -95.20763 0823-500 C 08 25 26.869117 -50 10 38.48735 -7.06041 -93.35106 0831-445 C 08 33 22.315631 -44 41 38.71463 -2.77977 -97.04408 0833-450 C 08 35 20.655289 -45 10 35.15391 -2.78726 -96.44804 0920-397 C 09 22 46.418275 -39 59 35.06753 7.19027 -94.64841 0959-443 C 10 1 59.907283 -44 38 0.60564 8.48927 -86.06662 1004-500 C 10 6 14.009559 -50 18 13.47089 4.37000 -82.07913 Name R.A. Dec. Gal. b Gal. l 0008-264 C 0 11 1.246752 -26 12 33.37686 -80.92652 36.45592 0104-408 O 1 6 45.107969 -40 34 19.96036 -76.18917 -69.33453 0118-272 C 1 20 31.663311 -27 1 24.65133 -83.52463 -146.33661 0135-247 D 1 37 38.346378 -24 30 53.88526 -79.28429 -158.60686 0150-334 C 1 53 10.121676 -33 10 25.86226 -75.37042 -118.93763 1147+245 D 11 50 19.212173 24 17 53.83503 75.95562 -138.85148 1155+251 D 11 58 25.787505 24 50 17.96369 77.87572 -139.14904 1156+295 C 11 59 31.833914 29 14 43.82693 78.37433 -160.58637 1213+350 D 12 15 55.601049 34 48 15.22053 79.19912 165.48024 1215+303 D 12 17 52.081987 30 7 0.63625 82.05288 -171.12516 1219+285 C 12 21 31.690512 28 13 58.50014 83.28802 -158.26477 1226+373 D 12 28 47.423662 37 6 12.09578 78.93803 147.14245 1240+381 C 12 42 51.369079 37 51 0.02510 79.12757 131.94832 1257+145 D 13 0 20.918799 14 17 18.53107 76.99325 -47.43343 1308+326 D 13 10 28.663845 32 20 43.78295 83.34593 85.70205 1315+346 C 13 17 36.494181 34 25 15.93257 80.79743 86.93673 1323+321 C 13 26 16.511396 31 54 9.51991 81.04764 67.23374 1324+224 D 13 27 0.861311 22 10 50.16306 80.52740 3.38099 1328+307 C 13 31 8.288145 30 30 32.95986 80.67466 56.52436 1338+381 C 13 40 22.951763 37 54 43.83468 75.10274 82.35931 List of Sources for the Secular Aberration Measurement

  11. CONCLUSION • Generation of precise fundamental celestial reference frame • Link of kinematical and dynamical celestial reference frames • Precise measurement of radio telescopes positionsin geocentric terrestrial reference frame • Parallax and proper motion measurements of pulsars • Tests of Theory of Relativity • measurements of secular aberration (motion of the Solar system).

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