solsys
|
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> Mars
struct, 18 elements
M: 6.41850e+23
R: 3.38950e+06
rho: 3933.00
aB: 0.250000
aV: 0.150000
H: -1.52000
tr: 30000.0
kI: 0.366000
a: 2.27920e+11
yr: 5.93551e+07
e: 0.0935000
srp: 88642.4
day: 88774.9
eps: 25.1900
P: 636.000
rhoa: 0.0200000
T: 210.000
mua: 43.3400
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 12-10-2007
dv> solsys("Mars")
Mars
M = 6.418500e23 kg Mass
R = 3.389500e6 m Volumetric mean radius
rho = 3933 kg/m^3 Mean mass density
aB = 0.250000 Bond albedo
aV = 0.150000 Visual geometric albedo
H = -1.520000 Absolute visual magnitude
tr = 30000 m Topographic range
kI = 0.366000 Moment of inertia coefficient (I/MR^2)
a = 2.279200e11 m Semimajor axis of orbit
yr = 5.935510e7 s Sidereal year (revolution period)
e = 0.093500 Orbital eccentricity
srp = 88642.398438 s Sidereal rotation period
day = 88774.898438 s Length of day
eps = 25.190001 degrees Rotation axial tilt
P = 636 Pa Atmospheric pressure at surface
rhoa = 0.020000 kg/m^3 Density of air at surface
T = 210 K Average surface temperature
mua = 43.340000 g/mol Mean molecular weight of atmospheric air
0
dv> solsys("srp")
"Sidereal day / rotation period (in seconds;
for the Sun, this is the rotation period at 16 degrees latitude)"
dv> solsys("mua")
"Mean molecular weight/mass of atmospheric air (in grams per mole - NOT SI)"
|
DavinciWiki Mini-Nav Bar Contents
Contact Developers
All other topics
Related Functions
Recent Library Changes Created On: 12-12-2007 |
