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Z Astromical Routines (Temporary)
01-16-2017, 06:53 PM (This post was last modified: 11-11-2017 07:48 PM by StephenG1CMZ.)
Post: #1
Z Astromical Routines (Temporary)
Some temporary routines I might include into an astronomy app one day

Stephen Lewkowicz (G1CMZ)
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01-16-2017, 06:56 PM (This post was last modified: 01-16-2017 07:01 PM by StephenG1CMZ.)
Post: #2
RE: Z Astromical Routines (Temporary)
atemp-planet estimates a planets temperature
(if a planets temperature is known to be different, maybe it is being warmed by fusion or is not in equilibrium)

Code:



 EST_PLANET_TEMP(R_ORBIT,STL_LUMINOSITY,ALBEDO)
 //FORMULA FOR ESTIMATING ANY PLANETS TEMP ANY STAR
 //PROVIDING INPUT=OUTPUT
 //RADIUS IN AU
 //LUMINOSITY OF STAR:SINCE THIS IS AN INPUT
 //FORMULA GOOD FOR MOST STARS.UNITS TBC
 //ALBEDO OF PLANET
 BEGIN
  LOCAL NUM;
  //STEFAN BOLTZMANN CONSTANT
  LOCAL KSB:=5.670400ᴇ−8;//J s−1 m−2 K−4
  LOCAL TEMP_K:=0;
  LOCAL DEN:=16*π*KSB*(R_ORBIT^2);

  IF DEN==0 THEN //NO DATA ON PLANET
   //NAN OR 0
  ELSE
   NUM:=STL_LUMINOSITY*(1-ALBEDO);
   TEMP_K:=(NUM/DEN)^(1/4);
  END;
  RETURN TEMP_K;
  //USING THIS FOR JUPITER ESTIMATES 112K
  //ITS INTERNAL HEATING RAISES THIS TO 152K
  //SO A DISCREPANCY CAN BE A USEFUL INDICATOR
 
 END;

 ///TIDALLY LOCKED NO ATMOSPHERE:
 //HOTTEST POLE:AVERAGE*√(2)
 //COLDEST POLE-:NEAR 0K

 EXPORT ATEMP_PLANET()
 BEGIN

 END;


Spacecraft

Code:


 EXPORT DRAG(CDRAG,RHO,VEL,AREA)
 //CDRAG:DRAG COEFFICIENT
 //TYPICALLY 2-4 FOR EARTH ORBITING STELLITES
 //VEL:SPACECRAFT VEL
 //RHO: AIR DENSITY
 //AREA: AREA OF BODY NORMAL TO FLOW

 BEGIN
  LOCAL FO:=0.5*CDRAG*RHO*VEL^2*AREA;
  RETURN FO;//FORCE
 END;

 EXPORT SOL_ACCEL(AREA,SATMASS)
 //ACCEL DUE TO SOLAR RADIATION
 //FOR EARTHORBITING SATELLITES ABUVE 800K:LARGER THAN ATMOSPHERIC DRAG
 //AREA:SUNWARD m2
 //SATMASS:SATELLITE MASS KG
 BEGIN
  LOCAL AR:=0;//SUNWARD ACCELERATION

  IF SATMASS THEN
   //MAGIC NUM FOR SUN ONLY
   AR:=(−4.5ᴇ−8*AREA)/SATMASS;
  END; 
  RETURN AR;//+SUNWARD LIKE GSUN
 END;

 EXPORT ASPACECRAFT()
 BEGIN

 END;

Magnitudes

Code:


 // NAKED EYE 6
 // BINOS 9
 // AMATEUR SCOPE 12
 // HUBBLE 31
 //NB DEFINITIONS VARY

 MAG_OBS_COMET_CALC(R_HELIO,R_OBS,SLOPE_N,M_ZERO)
 // CALC SOLAR COMET MAG INCLUDING COMA:RELATIVE TO GIVEN ABSOLUTE
 //HELIOCENTRIC DIST AU:M
 //OBS DIST/EARTH ASSUMED AU
 //SLOPE_N:RATE OF BRIGHTENING
 //4 AVERAGE 1S TIME 3..4 PERIODIC>4
 //M0: ABSOLUTE BRIGHTNESS AT 1AU
 BEGIN
  LOCAL M_ONE:=M_ZERO+5*LOG(R_OBS)+2.5*SLOPE_N*LOG(R_HELIO);
  RETURN M_ONE;
 END;

 EXPORT MAG_OBS_MPC(R_HELIO,R_OBS,MZERO,PHASEI)
 //MINOR PLANETS FORMULA RESEMBLES THAT FOR PLANETS, SANS LOOKUP
 //RELATIVE TO GIVEN ABSOLUTE
 // MZERO: ABS MAG
 // R IN AU
 // PHASEI: PHASE FUNCTION OF ANGLE I
 BEGIN
  LOCAL MAGOBS:=MZERO+5*LOG(R_HELIO*R_OBS)+PHASEI;
  RETURN MAGOBS;
 END;

 EXPORT EST_MPC_DIAMETER(ALBEDO,MZERO)
 //RELATES DIAMETER ALBEDO ABSOLUTE MAG
 
 BEGIN
  LOCAL DIAM:=0;
  IF ALBEDO==0 THEN
   //UNABLE TO EST DIAM
  ELSE 
   DIAM:=(1329/√(ALBEDO))*10^(−0.2*MZERO);
  END;
  RETURN DIAM;
 END;

 
 EXPORT AMAGNITUDES()
 BEGIN

 END;

Stephen Lewkowicz (G1CMZ)
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