homework4 - the motion is not directly away from the sun.)...

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1. 2. Find the average distance from the Sun to Pluto in parsecs. Compared to Pluto, how many times farther away from the Sun is Proxima Centauri? The average distance from the sun to Pluto is 39.5 AU ( p .157). But 1 pc = 206265 AU ( p .421), so the distance from the sun to Pluto in pc is 39.5/206265 = 0.000192 pc . Proxima Centauri is 1.30 pc distant, so Proxima Centauri is 1.30/0.000192 = 6800 times further away than Pluto . 3. http://web.me.com/tamirogers/Sun/Homework_files/NATS102HW7.pdf desktop also. 4. By definition distance (in parsec) = 1/parallax angle (in arcsec). So in this case distance = 1/0.153 = 6.54 parsec. 5. The distance to Kapetyn's star is d [pc] = 1/ p " = 1 / 0.255" = 3.92 pc. (a) The tangential velocity is v t [km/s] = 4.74 μ [arcsec/yr] d [pc] = 4.74 ×8.67 ×3.92 [km/s] = 161 km/s . (b) The actual speed is v = √(v r 2 + v r 2 ) = √(246 2 +161 2 ) = 294 km/s . (c) Since its radial velocity is positive, Kapetyn's star is moving away from the sun. (At the same time it is also moving across the line of sight, so
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Unformatted text preview: the motion is not directly away from the sun.) 6 7similar concept http://answers.yahoo.com/question/index?qid=20101120130510AAK0HD4 8 9 similar Stars A and B are equally bright as seen from earth, but A is 60pc away while B is 15pc away. ..? Which star is brighter? How much brighter? • 2 years ago • Report Abuse by ronwizfr Member since: October 02, 2006 Total points: 90,139 (Level 7) • Add Contact • Block Best Answer - Chosen by Asker The further star in intrinsically brighter. As brightness falls of as the distance squared star A is 4^2=16 times brighter than B. • 2 years ago • Report Abuse 10 same like 9. 11 similar like http://answers.yahoo.com/question/index?qid=20101112013429AAmUdxK 12may be the ans. As the flux falls off with the distance squared, the Earth would have to be sqrt(1370) = 37 times further away, more or less at the distance of Pluto. 13 14 15 1 18 19...
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This note was uploaded on 03/04/2012 for the course PHYS 2022 taught by Professor Jarrio during the Spring '12 term at Central GA Tech.

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homework4 - the motion is not directly away from the sun.)...

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