Templet:Infobokis Planet
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Other templates redirecting here: Infobox Nonstellar body · Infobox TNO
This template has been designed for the presentation of information on non-stellar astronomical bodies: planets (including extrasolar planets), dwarf planets, moons and minor planets. Some parameters will not be applicable to individual types; these may be omitted without any problems to the template's function. Usage notes
Recommended parametersFor a list of all parameters, see All parameters below. Exosolar planetsTemplet:Infobox planet {{Infobox planet |name = <!--(Common/agreed name)--> |image = |caption = |apsis = astron |discovery_ref = <!--(Any appropriate <ref>(s) to append to the name)--> |discoverer = |discovery_site = |discovered = <!--(Date)--> |discovery_method = |alt_names = <!--(Any alternative names for the body)--> |periastron = |apoastron = |semimajor = |avg_speed = <!--(Average orbital speed)--> |eccentricity = |period = <!--(Orbital period)--> |inclination = |angular_dist = |long_periastron = <!--(Longitude of periastron)--> |time_periastron = <!--(Time of periastron)--> |semi-amplitude = |mean_radius = |surface_area = |volume = |density = |mass = |surface_grav = <!--Equatorial surface gravity--> |escape_velocity = |albedo = |single_temperature = }} Minor planetsTemplet:Infobox planet {{Infobox planet |width = 25em |name = |symbol = |background = #FFFFC0 |image = |caption = |discovery_ref = <ref>....</ref> |discoverer = |discovered = |discovery_site = ''discovery_site'' |mp_name = <!--(Minor planet name)--> |mp_category = <!--(Minor planet category)--> |alt_names = <!--(Alternative names)--> |orbit_ref = <ref>...</ref> |epoch = |aphelion = |perihelion = |semimajor = |eccentricity = |period = |avg_speed = <!--(Average orbital speed)--> |inclination = |asc_node = <!--(Longitude of ascending node)--> |mean_anomaly = |arg_peri = <!--(Argument of perihelion)--> |satellites = |dimensions = |mass = |density = |surface_grav = <!--(Equatorial surface gravity)--> |escape_velocity = |sidereal_day = |axial_tilt = |pole_ecliptic_lat = <!--(Pole ecliptic latitude)--> |pole_ecliptic_lon = <!--(Pole ecliptic longitude)--> |albedo = |temp_name1 = |mean_temp_1 = |max_temp_1 = |temp_name2 = |max_temp_2 = |spectral_type = |abs_magnitude = <!--(Absolute magnitude)--> }} See here for means of semi-automating this template's transclusion as regards minor planets.
Notes on usage
Most of these entries should be measured in SI units. Some of them, however, should have more "human-accessible" units, in addition to SI units. I've indicated some cases with a second unit name in brackets. In the case of times (orbital periods, rotation), I think it best to give all periods in days for comparison purposes, and provide a translation (in parentheses) into years, days, hours, etc.; whatever is most appropriate for the duration being described. Oh, and compared to table templates for things like the elements, I think that this template should be considered somewhat more flexible. Moons with no atmosphere whatsoever could skip the atmospheric composition section entirely, for example (though atmospheric density would still be listed). Moons also wouldn't have their orbital radii listed in AU, since AUs are such large units. For planets, use "perihelion" and "aphelion" instead of "periapsis" and "apoapsis." In the case of "number of moons" and "is a moon of", only one of these rows will be used by any given object. There aren't any moons with moons (yet), though perhaps "co-orbital with" might be a useful row to add in a few cases. A set of colours for use in the 2-column headers of this table:
On orbital characteristics: The orbital circumference should be computed from the semi-major axis using Ramanujan's approximation for ellipses. The ratio of that circumference to the period then gives the average orbital speed. The minimum and maximum speeds follow from Kepler's laws: On physical characteristics: The surface area and volume of non-spherical objects (e.g. moonlets, asteroids) must use the proper ellipsoid formulae, because even slight departures from sphericity will make a large difference, particularly for the area. On the subject of obliquity: Obliquity is the angle between the object's axis of rotation and the normal to the plane of its orbit. Do not confuse this with the Tilt listed in the JPL pages, which is a measure of the angle between the local Laplace plane and the primary's equatorial plane. In fact, most inner moons have synchronous rotations, so their obliquities will be, by definition, zero. Outer moons simply have not been seen from close up enough to determine their true obliquities (although Phoebe, recently seen by the Cassini probe, is an exception; see Talk:Phoebe (moon) for the derivation of its obliquity). All parameters{{Infobox planet |width = <!--(Best given in font-proportional units such as 'em')--> |name = |symbol = <!--([[Image:...]])--> |background = |image = <!--([[Image:...]])--> |caption = |apsis = |discovery_ref = <ref>...</ref> |discoverer = |discovery_site = |discovered = |discovery_method = |mp_name = |pronounce = |named_after = |mp_category = |alt_names = |orbit_ref = <ref>...</ref> |epoch = |aphelion = |perihelion = |periastron = |apoastron = |periapsis = |apoapsis = |semimajor = |mean_orbit_radius = |eccentricity = |period = |synodic_period = |avg_speed = <!--(Average orbital speed)--> |mean_anomaly = |inclination = |angular_dist = <!--(Angular distance)--> |asc_node = <!--(Longitude of ascending node)--> |long_periastron = <!--(Longitude of periastron)--> |time_periastron = <!--(Time of periastron)--> |arg_peri = <!--(Argument of peri[helion/astron/...])--> |semi-amplitude = |satellite_of = |satellites = |dimensions = |flattening = |equatorial_radius = |polar_radius = |mean_radius = |circumference = |surface_area = |volume = |mass = |density = |surface_grav = <!--(Equatorial surface gravity)--> |escape_velocity = |sidereal_day = |rot_velocity = <!--(Rotational velocity)--> |axial_tilt = |right_asc_north_pole = <!--(North pole right ascension)--> |declination = <!--(North pole declination)--> |pole_ecliptic_lat = <!--(Pole ecliptic latitude)--> |pole_ecliptic_lon = <!--(Pole ecliptic longitude)--> |albedo = |single_temperature = |temp_name1 = |min_temp_1 = |mean_temp_1 = |max_temp_1 = |temp_name2 = |min_temp_2 = |mean_temp_2 = |max_temp_2 = |spectral_type = |magnitude = <!--(Apparent magnitude)--> |abs_magnitude = <!--(Absolute magnitude)--> |angular_size = |pronounce = {{IPA-en|<!-- IPA string -->|}} |adjectives = |atmosphere_ref = <ref>...</ref> |surface_pressure = |scale_height = |atmosphere_composition = }} Computed valuesThis section documents how some minor planet parameters may be computed when they're not directly measured. More detail can be found in Standard asteroid physical characteristics. Average orbital speedThis is very simply the orbital circumference divided by the orbital period. The exact circumference of an ellipse is E is close to An approximation using a taylor series expansion is AstOrb Browser computes a velocity using Ramanujan's approximation for an ellipse's circumference: Where b is the orbit's semi-minor axis: Surface gravity
For a spherical body of mass m, and radius r, the gravitational acceleration at the surface , is given by Where G = 6.6742 × 10−11 m3s-2kg-1 is the Gravitational constant, M is the mass of the body, and r its radius. This value is very approximate, as most minor planets are far from spherical. For irregularly shaped bodies, the surface gravity will differ appreciably with location. However, at the outermost point/s, where the distance to the centre of mass is the greatest, the surface gravity is still given by a simple formula, a slightly modified version of the above that uses the largest radius because all the body's mass is contained within this radius. On a rotating body, the apparent weight experienced by an object on the surface is reduced by the centrifugal force, when one is away from the poles. The centrifugal acceleration experienced at the equator is where T is the rotation period in seconds, and The effective surface gravity at the equator is then Escape velocityFor surface gravity g and radius r, the escape velocity is: This value is much less sensitive to the factors affecting the surface gravity, mentioned above. TemperatureFor asteroid albedo α, semimajor axis a, solar luminosity Where σ is Stefan-Boltzmann constant. See also Torrence V. Johnson, Paul R. Weissman, Lucy-Ann A. McFadden (2007). Encyclopedia of the Solar System. Elsevier. pp. p. 294. ISBN 0120885891.. Microformat
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