| 1 | subroutine orbite(pls,pdist_star,pdecli,pright_ascenc) |
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| 2 | |
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| 3 | use planete_mod, only: p_elips, e_elips, timeperi, obliquit |
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| 4 | implicit none |
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| 5 | !================================================================== |
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| 6 | ! |
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| 7 | ! Purpose |
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| 8 | ! ------- |
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| 9 | ! Distance from star and declination as a function of the stellar |
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| 10 | ! longitude Ls |
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| 11 | ! |
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| 12 | ! Inputs |
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| 13 | ! ------ |
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| 14 | ! pls Ls |
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| 15 | ! |
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| 16 | ! Outputs |
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| 17 | ! ------- |
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| 18 | ! pdist_star Distance Star-Planet in UA |
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| 19 | ! pdecli declinaison ( in radians ) |
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| 20 | ! pright_ascenc right ascension ( in radians ) |
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| 21 | ! |
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| 22 | !======================================================================= |
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| 23 | |
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| 24 | c Declarations: |
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| 25 | c ------------- |
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| 26 | |
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| 27 | #include "comcstfi.h" |
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| 28 | |
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| 29 | c arguments: |
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| 30 | c ---------- |
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| 31 | |
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| 32 | REAL pday,pdist_star,pdecli,pright_ascenc,pls,i |
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| 33 | |
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| 34 | c----------------------------------------------------------------------- |
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| 35 | |
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| 36 | c Star-Planet Distance |
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| 37 | |
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| 38 | pdist_star = p_elips/(1.+e_elips*cos(pls+timeperi)) |
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| 39 | |
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| 40 | c Stellar declination |
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| 41 | |
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| 42 | c ********************* version before 01/01/2000 ******* |
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| 43 | |
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| 44 | pdecli = asin (sin(pls)*sin(obliquit*pi/180.)) |
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| 45 | |
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| 46 | c********************* version after 01/01/2000 ******* |
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| 47 | c i=obliquit*pi/180. |
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| 48 | c pdecli=asin(sin(pls)*sin(i)/sqrt(sin(pls)**2+ |
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| 49 | c & cos(pls)**2*cos(i)**2)) |
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| 50 | c ****************************************************** |
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| 51 | |
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| 52 | c right ascencion |
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| 53 | If((pls.lt.pi/2.d0)) then |
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| 54 | pright_ascenc= atan(tan(pls)*cos(obliquit*pi/180.)) |
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| 55 | else if((pls.gt.pi/2.d0).and.(pls.lt.3.d0*pi/2.d0)) then |
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| 56 | pright_ascenc= pi+atan(tan(pls)*cos(obliquit*pi/180.)) |
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| 57 | else if((pls.gt.3.d0*pi/2.d0)) then |
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| 58 | pright_ascenc= 2.d0*pi+atan(tan(pls)*cos(obliquit*pi/180.)) |
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| 59 | else if (Abs(pls-pi/2.d0).le.1.d-10) then |
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| 60 | pright_ascenc= pi/2.d0 |
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| 61 | else |
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| 62 | pright_ascenc=-pi/2.d0 |
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| 63 | end if |
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| 64 | |
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| 65 | RETURN |
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| 66 | END |
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