MODELS OF STELLAR POPULATIONS IN THE NEIGHBOURHOOD OF THE SUN AND LONG-PERIODIC VARIATIONS OF UT Pechernikova G.V., Bashkirov A.G., Vityazev A.V.

Institute of Planetary Geophysics, United Institute of Earth Physics, Russian Academy of Sciences, 123810 Moscow, Russia

The explanations of the discrepancies between TD and UT and secular irregular variations of the Earth's rotation velocity are not well known at present. It is believed that the gravitational influence of the nearest stars on the pecularities of the planetary motions is negligibly small. In our works [1-4] was shown that this influence is actually small but in some cases is not negligible.

From the table we notice that these corrections level the known discrepancies between the ephemeris time and the Universal Time measured with the caesium standard.

Secular irregular variations of length of day are attributable to spatial variations of during the Solar system motion in the Galaxy.

References:

[1]: A.Vityazev, A.Bashkirov, Yu.Kukharenko, 1994, Papers of RAS, 33405, 639;
[2]: Yu.Kukharenko, A.Vityazev, A.Bashkirov, 1994, Phys. Letters A 195, 27;
[3]: A.Bashkirov, A.Vityazev, 1995, Phys. Letters (in press);
[4]: A.Vityazev, A.Bashkirov, 1995, Abs. Simp. 172 IAU, Paris, 172.