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Addition to Extrasolar Planets P a 2 For Extrasolar planets you can use to get a , the semi major axis. To find the mass of the planet, use the following formula. M planet v 30,000m / s P M For explanation, and examples next page. 3 sun 3 The mass for 16 Cygni did not workout for Clevis or I. The curve was not a sine curve, and I wonder if the fact that there is a second star is possibly causing a three body problem, rather than 2 body. This has taken me the better part of two days to go through all the information. The value of the parent star varied in data from .99 up to 1.1 solar masses, and from a G3 to G5 star. Lets find the mass of 16 Cygni . From last time: Use P a 2 2.18737303 years 3 to find a P= the period from the graph is so a turned out to be 1.6844 au this answer was good. To find the mass, use M planet v 30,000m / s P M 3 sun .M is mass, P is the period in years, and v is the radial velocity in m/sec. To get v , notice the majority of the peaks are at about 50m/sec on the left vertical side, and they go down to about –50 on the bottom. Mass = 1.7 MJUP Not Sinusoidal (Min) Orbit Period 2.2 yr 16 Cygni B Velocity Wobble The best I can do here is estimate both are about 50 , so 50+50=100 and 100/2 =50 so use 50 for v. Some graphs are better to read then this one was. Now I’m ready M planet M planet v 30, 000 m / s 50m / sec 30, 000 m / s 3 P M 3 sun 2.18737303 M sun M planet .0016666661.2980984 M sun M planet (.00216349) M sun To change to Jupiter mass multiply by1047.45 M planet (.00216349) 1047.45 M planet 2.16 M jupiter Most accepted Answer is 1.7 not bad. I also worked this problem for 51 Persi and got a to be .056459, good answer, and Mplanet to be .54 Mjupiter . The real answer was .45 Mjupiter. I found the curve for this one, and I used 68m/sec for v, but I could have estimated better. The peaks and the low points are not the same. Ignore the negative sign, add the numbers together , and divide by 2. That will be v. Jim Honeycutt