orbital parameters

list of orbitals parameters in use and denomination in different services. As the purpose of this page is homogenisation of these parameter, the content is subject to change often

parameter	Description	UCD	exoplanet	DynastVO	mpc	TNO	planets	unit
a	semi-major axis		semi_major_axis	semi_major_axis	semi_major_axis	semi_major_axis	semi_major_axis	au
e	eccentricity		eccentricity	eccentricity	eccentricity	eccentricity		_
I	inclination to the ecliptic (J2000)		inclination	inclination	inclination	inclination		deg
Ω	longitude of the ascending node (J2000.0)			long_asc	long_asc			deg
ω	argument of perihelion (J2000.0)		periastron	arg_perihel	arg_perihel			deg
M₀	mean anomaly at the epoch			mean_anomaly	mean_anomaly			deg
epoch				epoch (in JD)	epoch (in yr.xx)			JD or ISO
ν	true anomaly
rotation period	sidereal rotation period						sidereal_rotation_period	h
period	period		period					d
tzero_tr	time at the center of transit		tzero_tr
time at periastron	time of periastron passage							JD
time at conjunction	time of the star-planet upper conjunction		t_conj					JD
	time at center of second transit		tzero_tr_sec
λ Angle	sky-projected angle between the planetary orbital spin and the stellar rotational spin		lambda_angle					deg
dynamical type						dynamical_type		Lists here (2 levels): Small bodies sub-types

mass	mass						mass (kg)	kg, mass Earth, mass Jupiter
polar_radius							polar_radius polar_radius_uncertainty	km
equatorial radius						diameter	equatorial_radius equatorial_radius_uncertainty	km
mean radius							mean_radius mean_radius_uncertainty	km
rms_deviation	(radius std-dev in Planets)							km
elevation	(departure from ellipsoid)						elevation_min elevation_max	km
albedo						albedo
magnitude	For DynastVO		mag - to be changed?			magnitude

incidence								deg
emergence								deg
phase								deg

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Stéphane Erard