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Upsilon Tauri
Upsilon Tauri (υ Tauri) is a solitary, white-hued star in the zodiac constellation of Taurus (constellation), Taurus, and is a member of the Hyades (star cluster), Hyades open cluster, star cluster. It is faintly visible to the naked eye with an apparent visual magnitude of +4.3. Based upon an annual stellar parallax, parallax shift of 21.21 milliarcsecond, mas seen from Earth, it is around 154 light years from the Sun. Properties This is an A-type main sequence star with a stellar classification of A8 Vn. It is classified as a Delta Scuti variable, Delta Scuti type variable star and its brightness varies from magnitude +4.28 to +4.31 with a period of 3.56 hours. At an estimated age of 827 million years, it is spinning rapidly with a rotation period of just 0.415 days. This is giving the star an Oblate spheroid, oblate shape with an equatorial bulge that is 9% larger than the polar radius. Occasionally this star system shares the Bayer designati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
J2000
In astronomy, an epoch or reference epoch is a moment in time used as a reference point for some time-varying astronomical quantity. It is useful for the celestial coordinates or orbital elements of a celestial body, as they are subject to perturbations and vary with time. These time-varying astronomical quantities might include, for example, the mean longitude or mean anomaly of a body, the node of its orbit relative to a reference plane, the direction of the apogee or aphelion of its orbit, or the size of the major axis of its orbit. The main use of astronomical quantities specified in this way is to calculate other relevant parameters of motion, in order to predict future positions and velocities. The applied tools of the disciplines of celestial mechanics or its subfield orbital mechanics (for predicting orbital paths and positions for bodies in motion under the gravitational effects of other bodies) can be used to generate an ephemeris, a table of values giving ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
