The satellite Hipparcos 1 surprisingly found that an extensively studied open cluster—the Pleiades (also known as the Seven Sisters)—had a distance of … The Pleiades or Seven Sisters form a beautiful star cluster near the constellation Taurus. Most people see six, not seven, Pleiades stars in a dark country sky . Legend of the Lost Pleiad. They calculated the distance to the Pleiades cluster by watching five of its stars (two of them forming a binary system) over a period of 18 months. How to Find the Pleiades Star Cluster. The range of distance to the Pleiades cluster may seem somewhat imprecise, but in fact is accurate by astronomical standards. This will tell you the value of ( m-M ), and from that you will use equation (8) to calculate the distance d . The Pleiades cluster has an apparent magnitude of 1.6 and lies at an average distance of 444 light years from Earth. Its brightest stars lie at a distance between 390 and 460 light years. The distance to the Pleiades can be used as an important first step to calibrate the cosmic distance ladder. Comet Machholz appears to pass near the Pleiades in early 2005. The traditional method of measuring distance is by noting the precise position of a star and then measuring its slight change in position when Earth itself has moved to the other side of the sun. Pleiades main sequence sits on top of the standard main sequence. This is one of the nearest star clusters to Earth and perhaps the most beautiful to the naked eye. Messier 45 (M45), also known as the Pleiades or Seven Sisters, is a bright open star cluster located in the constellation Taurus, the Bull. The cluster is mostly composed of hot, blue, highly luminous stars belonging to the spectral class B with an estimated age under 100 million years. However, the story about the lost seventh Pleiad harbors a universal theme. As the cluster is so close to the Earth, its distance is relatively easy to measure and has been estimated by … The cluster's brightest star is Alcyone, judged to be seven times brighter than our sun. At a distance of 444.2 light-years, the closest star cluster to earth, the Pleiades are used to plot distance using a method called the "cosmic distance ladder."

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