3. (a) Describe what is meant by the proper motion of a star? (b) What is the distance to a star that appears to shift its position back and forth on the celestial sphere by 0.6 arc-seconds every six months relative to the distant background stars?
3. (a) Describe what is meant by the proper motion of a star? (b) What is the distance to a star that appears to shift its position back and forth on the celestial sphere by 0.6 arc-seconds every six months relative to the distant background stars?
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
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Transcribed Image Text:**Question 3:**
(a) Describe what is meant by the proper motion of a star?
(b) What is the distance to a star that appears to shift its position back and forth on the celestial sphere by 0.6 arc-seconds every six months relative to the distant background stars?
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3. (a) Proper motion of a star can be described as an angular modification in the position of the star across the line of sight of an observer. It is generally measured in arc-seconds per year. In a more precise form, the proper motion of a star can also be described as the angular velocity of the star measured in respect to the Sun.
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