Guest User

Untitled

a guest
Jul 14th, 2020
93
Never
Not a member of Pastebin yet? Sign Up, it unlocks many cool features!
  1.     import numpy as np
  2.     import matplotlib.pyplot as plt
  3.  
  4.     halfpi, pi, twopi = [f*np.pi for f in (0.5, 1, 2)]
  5.     to_degs, to_rads = 180/pi, pi/180
  6.  
  7.     e = 0.055
  8.     a = 1.0
  9.     mu = 1.0
  10.     T = twopi # period for a=1 and mu=1
  11.  
  12.     # from https://space.stackexchange.com/a/43237/12102
  13.  
  14.     theta = np.linspace(-pi, pi, 501)
  15.     E = 2. * np.arctan(np.sqrt((1.-e)/(1.+e)) * np.tan(theta/2))
  16.     t = a * np.sqrt(a/mu) * (E - e * np.sin(E))
  17.  
  18.     libration = theta - twopi * t/T
  19.  
  20.     if True:
  21.         plt.figure()
  22.         fs = 14
  23.         plt.subplot(2, 2, 1)
  24.         plt.plot(t/T, theta*to_degs)
  25.         plt.xlabel('time (fraction of period)', fontsize=fs)
  26.         plt.ylabel('theta (deg)', fontsize=fs)
  27.         plt.xlim(-0.5, 0.5)
  28.         plt.ylim(-180, 180)
  29.         plt.subplot(2, 2, 2)
  30.         plt.plot(theta*to_degs, t/T)
  31.         plt.xlabel('theta (deg)', fontsize=fs)
  32.         plt.ylabel('time (fraction of period)', fontsize=fs)
  33.         plt.xlim(-180, 180)
  34.         plt.ylim(-0.5, 0.5)
  35.         plt.subplot(2, 1, 2)
  36.         plt.plot(t/T, libration*to_degs)
  37.         plt.xlabel('time (fraction of period)', fontsize=fs)
  38.         plt.ylabel('apparent libration (deg)', fontsize=fs)
  39.         plt.xlim(-0.5, 0.5)
  40.         plt.text(0.15, 0, 'max: ' + str(round((libration*to_degs).max(), 2))  + u'\xb0', fontsize=fs)
  41.         # https://stackoverflow.com/questions/3215168/how-to-get-character-in-a-string-in-python
  42.         plt.show()
RAW Paste Data

Adblocker detected! Please consider disabling it...

We've detected AdBlock Plus or some other adblocking software preventing Pastebin.com from fully loading.

We don't have any obnoxious sound, or popup ads, we actively block these annoying types of ads!

Please add Pastebin.com to your ad blocker whitelist or disable your adblocking software.

×