Direct estimation of the Solar acceleration using geodetic/ astrometric VLBI observations
The secular aberration drift observed as the apparent proper motion of extragalactic radio sources is caused by the acceleration of the coordinate origin, the Solar System barycenter. So, the acceleration can be estimated as a global parameter by using the 30 years global geodetic/astrometric VLBI d...
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| Veröffentlicht in: | Science China. Physics, mechanics & astronomy mechanics & astronomy, 2012-02, Vol.55 (2), p.329-332 |
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| creator | Xu, MingHui Wang, GuangLi Zhao, Ming |
| description | The secular aberration drift observed as the apparent proper motion of extragalactic radio sources is caused by the acceleration of the coordinate origin, the Solar System barycenter. So, the acceleration can be estimated as a global parameter by using the 30 years global geodetic/astrometric VLBI data. This estimation is independent of any kinematic or dynamic model of the Milky Way or statistics hypothesis. The estimated acceleration in the direction of the Galactic center is （0.80±0.04） cm· s^-1· yr^-1, while the other two components are （-0.01＋0.06） and （0.52±0.05） cm· s^-1· yr^-1 in the direction along the Solar motion in the Galactic plane and in the direction normal to the Galactic plane, respectively. The estimate of the acceleration independently provides another kinematics parameter without referring to any objects within the Galaxy. |
| doi_str_mv | 10.1007/s11433-011-4602-8 |
| format | Article |
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| subjects | Astronomy Center of gravity Classical and Continuum Physics Dynamic models Extragalactic radio sources Kinematics Observations and Techniques Parameters Physics Physics and Astronomy Radio astronomy Radio sources (astronomy) VLBI观测 大地 天文 太阳能系统 河外射电源 直接估计 运动学参数 银河系中心 |
| title | Direct estimation of the Solar acceleration using geodetic/ astrometric VLBI observations |
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