Eclipses

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Daily eclipses are recurring events modeled identically for each day of the year. To include a daily, eclipse, a few parameters must be specified:
 
Daily eclipses are recurring events modeled identically for each day of the year. To include a daily, eclipse, a few parameters must be specified:
  
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:Eclipse #forces an eclipse (Default = "F")  
+
:'''Eclipse''' #forces an eclipse (Default = "F")  
  
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:Eclipser #Eclipser name, for example "Mars_Mars" for a Phobos or Deimos study
+
:'''Eclipser''' #Eclipser name, for example "Mars" for a Phobos or Deimos study
  
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:Ecl_Cent_Hr #Eclipse central hour [0-24]
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:'''Ecl_Cent_Hr''' #Eclipse central hour [0-24]
  
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:Bias #Eclipse Bias (0 => perfect alignement; 1 => partial eclipse); see below for a graphical definition of Bias
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:'''Bias''' #Eclipse Bias (0 => perfect alignement; 1 => partial eclipse); see below for a graphical definition of Bias
  
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:Eclipse_Style = 1 #=1 Forces daily eclipses                                                               
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:'''Eclipse_Style''' = 1 #=1 Forces daily eclipses                                                               
  
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:Date #[ J2000 date of Rare eclipse ] Unused by the KRC for rare eclipses (but required / need to test?)
+
:'''Date''' #[ J2000 date of Rare eclipse ] Unused by the KRC for rare eclipses (but required / need to test?)
  
 
Example: include a solar eclipse by Mars on Phobos using standard Phobos/Mars orbital properties:
 
Example: include a solar eclipse by Mars on Phobos using standard Phobos/Mars orbital properties:
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:Eclipse      = "T"                                                                      #forces an eclipse (Default = "F")  
 
:Eclipse      = "T"                                                                      #forces an eclipse (Default = "F")  
  
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:Eclipser        = "Mars_Mars"                                                              #Eclipser name
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:Eclipser        = "Mars"                                                              #Eclipser name
  
 
:Ecl_Cent_Hr  = 12.                                                                      #Eclipse central hour
 
:Ecl_Cent_Hr  = 12.                                                                      #Eclipse central hour
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:Date          = 0.
 
:Date          = 0.
  
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  out = krc( lat = 12. ,INERTIA = 50. ,body = "Mars,Phobos", LKofT = "T", Eclipse = Eclipse, Eclipser = Eclipser, Ecl_Cent_Hr = Ecl_Cent_Hr, Bias = Bias, Eclipse_Style = Eclipse_Style,Date = Date, bodytype = "minor")
+
  out = krc( lat=12.,INERTIA=50.,body="Phobos",LKofT="T",Eclipse=Eclipse,Eclipser=Eclipser,Ecl_Cent_Hr=Ecl_Cent_Hr,Bias=Bias,Eclipse_Style=Eclipse_Style,Date=Date)
  
 
When working with eclipses, it may be beneficial to increase the time resolution of the output by increasing N24
 
When working with eclipses, it may be beneficial to increase the time resolution of the output by increasing N24
  
−
  out = krc( lat = 12. ,INERTIA = 50. ,body = "Mars,Phobos", LKofT = "T", Eclipse = Eclipse, Eclipser = Eclipser, Ecl_Cent_Hr = Ecl_Cent_Hr, Bias = Bias, Eclipse_Style = Eclipse_Style,Date = Date, bodytype = "minor", N24 = 96 * 100)
+
  out = krc( lat=12.,INERTIA=50.,body="Phobos",LKofT="T",Eclipse=Eclipse,Eclipser=Eclipser,Ecl_Cent_Hr=Ecl_Cent_Hr,Bias=Bias,Eclipse_Style=Eclipse_Style,Date=Date,N24=96*100)
  
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[[Image:Phobos_Fluxes_5.png|600px]]
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[[Image:Phobos_Fluxes_5.png|800px]]
  
 
==Rare Eclipses==
 
==Rare Eclipses==
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Rare eclipses are one time events. To include a rare, eclipse, a few parameters must be specified:
 
Rare eclipses are one time events. To include a rare, eclipse, a few parameters must be specified:
  
−
Eclipse #forces an eclipse (Default = "F")  
+
:'''Eclipse''' #forces an eclipse (Default = "F")  
  
−
:Eclipser #Eclipser name, for example "Mars,Phobos" for a partial solar eclipse by Phobos
+
:'''Eclipser''' #Eclipser name, for example "Mars,Phobos" for a partial solar eclipse by Phobos
  
−
:Ecl_Cent_Hr #Eclipse central hour [0-24]
+
:'''Ecl_Cent_Hr''' #Eclipse central hour [0-24]
  
−
:Bias #Eclipse Bias (0 => perfect alignement; 1 => partial eclipse); see below for a graphical definition of Bias
+
:'''Bias''' #Eclipse Bias (0 => perfect alignement; 1 => partial eclipse); see below for a graphical definition of Bias
  
−
:Eclipse_Style = 2 #=2 Forces rare eclipses                                                               
+
:'''Eclipse_Style''' = 2 #=2 Forces rare eclipses                                                               
  
−
:Date #[ J2000 date of Rare eclipse ]
+
:'''Date''' #[ J2000 date of Rare eclipse ]
−
 
+
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DEVELOP AN EXAMPLE HERE
+
  
 
SEE IF fort46 file is being written
 
SEE IF fort46 file is being written
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==Artificial Eclipses==
 
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This section is under construction.
 
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It may be possible to fake artificial eclipses (for example as seen by a radiometer measurment, caused by a lander's solar panel) using made up orbital parameters and daily eclipses.
 
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Text here to illustrate a case if this works.
 
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==Definition of Bias==
 
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Eclipses require to provide the "Bias", defined as Sun/Eclipsed Body center line closest approach to the Occulting Body center, as a fraction of the Occulting Body radius; + is North.
 
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See the figure below: the Bias quantifies how "long" or how "perfect" an eclipse is, and is quantified for Earth as "Gamma" (here Bias = -0.3014).
 
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[[Image:Bias_def.png|800px]]
 
  
 
= Input Files =
 
= Input Files =
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=Known Issues=
 
=Known Issues=
  
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If Ecl_Cent_Hr is provided, an eclipse will be simulated even if Eclipse is set to "F"
+
1. If Ecl_Cent_Hr is provided, an eclipse will be simulated even if Eclipse is set to "F"

Latest revision as of 16:29, 14 May 2020

KRC differentiates daily eclipses, such as those experiences by Galilean satellites, from rare eclipses, for example partial solar eclipse by Phobos as seen from the surface of Mars.

Contents

[edit] Daily Eclipses

Daily eclipses are recurring events modeled identically for each day of the year. To include a daily, eclipse, a few parameters must be specified:

Eclipse #forces an eclipse (Default = "F")
Eclipser #Eclipser name, for example "Mars" for a Phobos or Deimos study
Ecl_Cent_Hr #Eclipse central hour [0-24]
Bias #Eclipse Bias (0 => perfect alignement; 1 => partial eclipse); see below for a graphical definition of Bias
Eclipse_Style = 1 #=1 Forces daily eclipses
Date #[ J2000 date of Rare eclipse ] Unused by the KRC for rare eclipses (but required / need to test?)

Example: include a solar eclipse by Mars on Phobos using standard Phobos/Mars orbital properties:

Eclipse = "T" #forces an eclipse (Default = "F")
Eclipser = "Mars" #Eclipser name
Ecl_Cent_Hr = 12. #Eclipse central hour
Bias = 0.0 #Eclipse Bias (0 => perfect alignement; 1 => partial eclipse)
Eclipse_Style = 1
Date = 0. 
out = krc( lat=12.,INERTIA=50.,body="Phobos",LKofT="T",Eclipse=Eclipse,Eclipser=Eclipser,Ecl_Cent_Hr=Ecl_Cent_Hr,Bias=Bias,Eclipse_Style=Eclipse_Style,Date=Date)

When working with eclipses, it may be beneficial to increase the time resolution of the output by increasing N24 

out = krc( lat=12.,INERTIA=50.,body="Phobos",LKofT="T",Eclipse=Eclipse,Eclipser=Eclipser,Ecl_Cent_Hr=Ecl_Cent_Hr,Bias=Bias,Eclipse_Style=Eclipse_Style,Date=Date,N24=96*100)

Phobos Fluxes 5.png

[edit] Rare Eclipses

Rare eclipses are one time events. To include a rare, eclipse, a few parameters must be specified:

Eclipse #forces an eclipse (Default = "F")
Eclipser #Eclipser name, for example "Mars,Phobos" for a partial solar eclipse by Phobos
Ecl_Cent_Hr #Eclipse central hour [0-24]
Bias #Eclipse Bias (0 => perfect alignement; 1 => partial eclipse); see below for a graphical definition of Bias
Eclipse_Style = 2 #=2 Forces rare eclipses
Date #[ J2000 date of Rare eclipse ]

SEE IF fort46 file is being written

[edit] Input Files

[edit] Earth/Moon

MoonA.inp

[edit] Mars/Phobos

PhoH.inp

[edit] Europa/Jupiter

EurH.inp

[edit] Known Issues

1. If Ecl_Cent_Hr is provided, an eclipse will be simulated even if Eclipse is set to "F"

Retrieved from "https://krc.mars.asu.edu/index.php?title=Eclipses&oldid=2839"
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