[yt-svn] commit/yt: 2 new changesets

[Bitbucket]

2 new commits in yt:


https://bitbucket.org/yt_analysis/yt/changeset/61c0d10ed14c/
changeset:   61c0d10ed14c
branch:      yt
user:        ngoldbaum
date:        2012-12-15 00:54:41
summary:     Increasing the precision of physical constants.  Closes #479.
affected #:  1 file

diff -r 9cf22c654aa695024341fad30afeb68fa06c6e65 -r 61c0d10ed14c4a5cb8b8ff488cf4a0d9ae3a9f5f yt/utilities/physical_constants.py
--- a/yt/utilities/physical_constants.py
+++ b/yt/utilities/physical_constants.py
@@ -1,26 +1,31 @@
 #
 # Physical Constants and Units Conversion Factors
 #
+# Values for these constants are drawn from IAU and IUPAC data 
+# unless otherwise noted:
+# http://maia.usno.navy.mil/NSFA/IAU2009_consts.html
+# http://goldbook.iupac.org/list_goldbook_phys_constants_defs.html
 
 # Masses
-mass_hydrogen_cgs = 1.67e-24  # g
-mass_electron_cgs = 9.11e-28  # g
-amu_cgs           = 1.66053886e-24  # g
-mass_sun_cgs = 1.9891e33  # g
+mass_hydrogen_cgs = 1.674534e-24  # g
+mass_electron_cgs = 9.1093898e-28  # g
+amu_cgs           = 1.6605402e-24  # g
+mass_sun_cgs = 1.98841586e33  # g
 # Velocities
 speed_of_light_cgs = 2.99792458e10  # cm/s, exact
 
 # Cross Sections
-cross_section_thompson_cgs = 6.65e-25  # cm^2
+# 8*pi/3 (alpha*hbar*c/(2*pi))**2
+cross_section_thompson_cgs = 6.65245854533e-25  # cm^2
 
 # Charge
-charge_proton_cgs = 4.803e-10  # esu = 1.602e-19  Coulombs
+charge_proton_cgs = 4.8032056e-10  # esu = 1.602176487e-19  Coulombs
 
 # Physical Constants
 boltzmann_constant_cgs = 1.3806504e-16  # erg K^-1
 gravitational_constant_cgs  = 6.67428e-8  # cm^3 g^-1 s^-2
 planck_constant_cgs   = 6.62606896e-27  # erg s
-stefan_boltzmann_constant_cgs = 5.670373e-5 # erg cm^-2 s^-1 K^-4
+stefan_boltzmann_constant_cgs = 5.67051e-5 # erg cm^-2 s^-1 K^-4
 rho_crit_now = 1.8788e-29  # g times h^2 (critical mass for closure, Cosmology)
 
 # Misc. Approximations
@@ -32,14 +37,14 @@
 mpc_per_mpc   = 1e0
 mpc_per_kpc   = 1e-3
 mpc_per_pc    = 1e-6
-mpc_per_au    = 4.847e-12
-mpc_per_rsun  = 2.253e-14
-mpc_per_miles = 5.216e-20
-mpc_per_cm    = 3.24e-25
+mpc_per_au    = 4.84813682e-12
+mpc_per_rsun  = 2.253962e-14
+mpc_per_miles = 5.21552871e-20
+mpc_per_cm    = 3.24077929e-25
 km_per_pc     = 1.3806504e13
 km_per_m      = 1e-3
 km_per_cm     = 1e-5
-pc_per_cm     = 3.24e-19
+pc_per_cm     = 3.24077929e-19
 
 m_per_fpc     = 0.0324077649
 



https://bitbucket.org/yt_analysis/yt/changeset/0bc5b45d3421/
changeset:   0bc5b45d3421
branch:      yt
user:        MatthewTurk
date:        2012-12-15 02:37:33
summary:     Merged in ngoldbaum/yt (pull request #373: Increasing the precision of physical constants.  Closes #479.)
affected #:  1 file

diff -r 2ab3aa1758c34a0aa0c52a8d3fcc4556ef7b8e0f -r 0bc5b45d3421fbe71246dc4de2a1c871fbf989bf yt/utilities/physical_constants.py
--- a/yt/utilities/physical_constants.py
+++ b/yt/utilities/physical_constants.py
@@ -1,26 +1,31 @@
 #
 # Physical Constants and Units Conversion Factors
 #
+# Values for these constants are drawn from IAU and IUPAC data 
+# unless otherwise noted:
+# http://maia.usno.navy.mil/NSFA/IAU2009_consts.html
+# http://goldbook.iupac.org/list_goldbook_phys_constants_defs.html
 
 # Masses
-mass_hydrogen_cgs = 1.67e-24  # g
-mass_electron_cgs = 9.11e-28  # g
-amu_cgs           = 1.66053886e-24  # g
-mass_sun_cgs = 1.9891e33  # g
+mass_hydrogen_cgs = 1.674534e-24  # g
+mass_electron_cgs = 9.1093898e-28  # g
+amu_cgs           = 1.6605402e-24  # g
+mass_sun_cgs = 1.98841586e33  # g
 # Velocities
 speed_of_light_cgs = 2.99792458e10  # cm/s, exact
 
 # Cross Sections
-cross_section_thompson_cgs = 6.65e-25  # cm^2
+# 8*pi/3 (alpha*hbar*c/(2*pi))**2
+cross_section_thompson_cgs = 6.65245854533e-25  # cm^2
 
 # Charge
-charge_proton_cgs = 4.803e-10  # esu = 1.602e-19  Coulombs
+charge_proton_cgs = 4.8032056e-10  # esu = 1.602176487e-19  Coulombs
 
 # Physical Constants
 boltzmann_constant_cgs = 1.3806504e-16  # erg K^-1
 gravitational_constant_cgs  = 6.67428e-8  # cm^3 g^-1 s^-2
 planck_constant_cgs   = 6.62606896e-27  # erg s
-stefan_boltzmann_constant_cgs = 5.670373e-5 # erg cm^-2 s^-1 K^-4
+stefan_boltzmann_constant_cgs = 5.67051e-5 # erg cm^-2 s^-1 K^-4
 rho_crit_now = 1.8788e-29  # g times h^2 (critical mass for closure, Cosmology)
 
 # Misc. Approximations
@@ -32,9 +37,9 @@
 mpc_per_mpc   = 1e0
 mpc_per_kpc   = 1e-3
 mpc_per_pc    = 1e-6
-mpc_per_au    = 4.847e-12
-mpc_per_rsun  = 2.253e-14
-mpc_per_miles = 5.216e-20
+mpc_per_au    = 4.84813682e-12
+mpc_per_rsun  = 2.253962e-14
+mpc_per_miles = 5.21552871e-20
 mpc_per_cm    = 3.24077929e-25
 km_per_pc     = 1.3806504e13
 km_per_m      = 1e-3

Repository URL: https://bitbucket.org/yt_analysis/yt/

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