Star-Stallar Parallax and Space Navigation
• Stars’ positions relative to other stars can shift due to stellar parallax, a phenomenon occurring every six months when the earth is on opposite sides of the sun.
• This phenomenon provides two different viewpoints, similar to looking at a candle with one eye at a time.
• Interplanetary missions are monitored by earth-centered radio antennae, which decreases signal strength as spacecraft travel farther.
• New Horizons, a spacecraft launched by NASA in 2006, was at 46.89-times the earth-sun distance, close to the 47.11 AU estimated by radio-tracking.
• Astronomers have discovered a simple trick to help New Horizons navigate through space using only two stars.
• The New Horizons mission, launched in 2006, went beyond 60x the sun-earth distance in 2024, a new record.
• The study proposes a simple way to navigate spacecraft using stellar parallax, the same method early astronomers used to measure stars’ distances from the earth.
Star Navigation Study: A New Approach
• Astronomers observed two stars from Earth using New Horizons’ instruments, Proxima Centauri and Wolf 359.
• The stars were chosen for their large parallaxes and brightness for the camera.
• The European Space Agency’s Gaia spacecraft provided the 3D positions of stars in a fixed, universal reference frame.
• The parallax was 32.4 arcseconds for Proxima and 15.7 arcseconds for Wolf 359 at the time of measurement.
• The parallax indicated that New Horizons was positioned at 46.89-times the earth-sun distance, close to the 47.11 AU estimated by radio-tracking measurements from the earth.
• The technique could be the simplest way to navigate spacecraft as it doesn’t require special equipment.
• The study is not yet ready for practical use, but a better camera on another spacecraft could help improve accuracy.
• The study is not practical for navigation on New Horizons, but could be useful for deeper space missions like interstellar travel.
• Researchers are also investigating pulsar navigation, which uses rapidly spinning neutron stars to show the way.
Star Distance Measurement is important topic for Civil service exam (WBCS).
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