|
K2-25
K2-25 is a young red dwarf star located in the Hyades (star cluster), Hyades cluster. There is a single known Neptune-sized planet in a 3.5 day orbit. Hyades cluster Using proper motion measurements in a search for low-luminosity members of the Hyades cluster, William van Altena first identified the star vA 50 (later known as K2-25) as a probable cluster member. Membership in the Hyades cluster was later confirmed. Properties K2-25 is a red dwarf that is only 26% the mass of the Sun and less than 1% of the luminosity. As a member of the Hyades cluster, it is only 650 million years old as compared to the Sun's 4.5 billion. There is clear evidence for starspot activity in both the Kepler data and radial velocity, radial velocities as well as the associated activity indicators. Planetary system The star has one known planet, K2-25b, with searches of the Kepler space telescope data for Astronomical transit, transits of additional planets being negative. Analysis of transit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hyades (star Cluster)
The Hyades (; Greek Ὑάδες, also known as Caldwell 41, Collinder 50, or Melotte 25) is the nearest open cluster and one of the best-studied star clusters. Located about away from the Sun, it consists of a roughly spherical group of hundreds of stars sharing the same age, place of origin, chemical characteristics, and motion through space. From the perspective of observers on Earth, the Hyades Cluster appears in the constellation Taurus, where its brightest stars form a "V" shape along with the still-brighter Aldebaran. However, Aldebaran is unrelated to the Hyades, as it is located much closer to Earth (65 light-years) and merely happens to lie along the same line of sight. The five brightest member stars of the Hyades have consumed the hydrogen fuel at their cores and have evolved into giant stars. Four of these stars, with Bayer designations Gamma, Delta1, Epsilon, and Theta2 Tauri, form an asterism that is traditionally identified as the head of Taurus the Bull. The f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |