solsys
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Contents: Description, Arguments, Usage, Examples, Sub-Functions, Related Functions, Source Supported Under Version: >1.00
Description Displays description of solar system structures (Sun, Earth, Moon, Mars, Phobos, Deimos) or a description of a field in those structures This is a user-defined function from constants.dvrc
Arguments and Return Values Arguments: A string with the name of the structure or field for which a description is needed Return Value: When given the name of one of the solar system structures, the function prints a description of each element of the structure (but returns zero). When given the name of one of the fields in the structures, it returns a string with the description of the field. If no arguments are input, solsys() prints its description, as shown below.
Usage Syntax: solsys("field") or solsys("structure")
Examples dv> solsys()
solsys returns descriptions of solar system planet structures
solsys("fieldname") returns description of the input field
e.g. solsys("M") returns "Mass (in kilograms)"
solsys("structname") prints a full description of the specified structure
e.g. solsys("Mars") explains every field in the Mars structure
Input must be a string
Values in SI/mks units, from NASA planetary fact sheets:
http://nssdc.gsfc.nasa.gov/planetary/planetfact.html
S.Marshall 02-18-2008
0
dv> solsys("Mars")
Mars
M = 6.4185e+23 kg Mass
R = 3.3895e+06 m Volumetric mean radius
rho = 3933 kg/m^3 Mean mass density
aB = 0.250 Bond albedo
aV = 0.150 Visual geometric albedo
H = -1.52 Absolute visual magnitude
tr = 30000 m Topographic range
kI = 0.366 Moment of inertia coefficient (I/MR^2)
a = 2.2792e+11 m Semimajor axis of orbit
yr = 5.93551e+07 s Sidereal year (revolution period)
e = 0.0935 Orbital eccentricity
srp = 88642.4 s Sidereal rotation period
day = 88774.9 s Length of day
eps = 25.19 degrees Rotation axial tilt
P = 636 Pa Atmospheric pressure at surface
rhoa = 0.020 kg/m^3 Density of air at surface
T = 210 K Average surface temperature
mua = 43.34 g/mol Mean molecular weight of atmospheric air
0
dv> solsys("R")
"Volumetric mean radius (for near-spherical objects;
median axis radius for irregular objects; in meters)"
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Recent Library Changes Created On: 12-12-2007 |
