Constants¶

Constant to convert radians to arcseconds. Equal to (3603600)/(2pi). Units: *as/rad

Earth's equatorial radius. [m]

References:

1. GGM05s Gravity Model

Astronomical Unit. Equal to the mean distance of the Earth from the sun. TDB-compatible value. Units: m

References:

1. P. Gérard and B. Luzum, IERS Technical Note 36, 2010

Constant to convert radians to degrees. Equal to 360/2pi. Units: deg/rad

Earth's first zonal harmonic. [dimensionless]

References:

1. GGM05s Gravity Model.

Earth's first eccentricity. WGS84 Value. [dimensionless]

References:

1. NIMA Technical Report TR8350.2

Mean obliquity of the ecliptic at J2000 (IAU 2006 precession model). [arcseconds]

Convert to radians at point of use with AS2RAD.

References:

1. P. Gérard and B. Luzum, IERS Technical Note 36, 2010

Gravitational constant of Saturn. [m^3/s2]

References:

1. O. Montenbruck, and E. Gill, Satellite Orbits: Models, Methods and Applications, 2012.

Gravitational constant of Jupiter. [m^3/s2]

References:

1. O. Montenbruck, and E. Gill, Satellite Orbits: Models, Methods and Applications, 2012.

Gravitational constant of Venus. [m^3/s2]

References:

1. O. Montenbruck, and E. Gill, Satellite Orbits: Models, Methods and Applications, 2012.

Gravitational constant of Mercury. [m^3/s2]

References:

1. O. Montenbruck, and E. Gill, Satellite Orbits: Models, Methods and Applications, 2012.

Gravitational constant of Pluto. [m^3/s2]

References:

1. O. Montenbruck, and E. Gill, Satellite Orbits: Models, Methods and Applications, 2012.

Gravitational constant of the Earth-Moon barycenter. [m^3/s2]

References:

1. O. Montenbruck, and E. Gill, Satellite Orbits: Models, Methods and Applications, 2012.

Gravitational constant of Uranus. [m^3/s2]

References:

1. O. Montenbruck, and E. Gill, Satellite Orbits: Models, Methods and Applications, 2012.

Nominal solar photospheric radius. [m]

References:

1. O. Montenbruck, and E. Gill, Satellite Orbits: Models, Methods and Applications, 2012.

Gravitational constant of Neptune. [m^3/s2]

References:

1. O. Montenbruck, and E. Gill, Satellite Orbits: Models, Methods and Applications, 2012.

Gravitational constant of Mars. [m^3/s2]

References:

1. O. Montenbruck, and E. Gill, Satellite Orbits: Models, Methods and Applications, 2012.

Earth axial rotation rate. [rad/s]

References:

1. D. Vallado, Fundamentals of Astrodynamics and Applications (4^th Ed.), p. 222, 2010

Modified Julian Date of the J2000.0 epoch (2000-01-01 12:00:00 TT). Units: days

Speed of light in vacuum. Units: m/s

References:

1. D. Vallado, Fundamentals of Astrodynamics and Applications (4^th Ed.), 2010

Gravitational constant of the Sun. [m^3/s2]

References:

1. O. Montenbruck, and E. Gill, Satellite Orbits: Models, Methods and Applications, 2012.

Gravitational constant of the Moon. [m^3/s2]

References:

1. O. Montenbruck, and E. Gill, Satellite Orbits: Models, Methods and Applications, 2012.

Offset between Julian Date and Modified Julian Date. Units: days

Constant to convert arcseconds to radians. Equal to 2pi/(3603600). Units: *rad/as

Earth's semi-major axis as defined by the WGS84 geodetic system. [m]

References:

1. NIMA Technical Report TR8350.2

Nominal solar radiation pressure at 1 AU. [N/m^2]

References:

1. O. Montenbruck, and E. Gill, Satellite Orbits: Models, Methods and Applications, 2012.

Earth's ellipsoidal flattening. WGS84 Value.

References:

1. NIMA Technical Report TR8350.2

Earth's Gravitational constant [m^3/s2]

References:

1. O. Montenbruck, and E. Gill, Satellite Orbits: Models, Methods and Applications, 2012.