Property talk:P2233

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semi-major axis of an orbit
semi-major axis of a stable orbit (Astronomy)

Description	The semi-major axis of a stable orbit.
Represents	semi-major axis of an orbit (Q78148275)
Data type	Quantity
Template parameter	en:template:Infobox planet semimajor
Domain	According to this template: Any astronomical object in a stable orbit (mostly planets) According to statements in the property: orbit (Q4130), astronomical object (Q6999), spacecraft (Q40218), spaceflight (Q5916) or circumstellar disk (Q3235978) When possible, data should only be stored as statements
Allowed units	kilometre (Q828224), astronomical unit (Q1811) or parsec (Q12129)
Example	orbit of Earth (Q1348808) → 1.00000261 astronomical unit Haumea (Q601) → 42.9917 astronomical unit Halley's Comet (Q23054) → 17.8341 astronomical unit
Source	http://ssd.jpl.nasa.gov/?sat_elem https://www.wikidata.org/wiki/Q272626
Tracking: usage	Category:Pages using Wikidata property P2233 (Q28016462)
See also	orbital eccentricity (P1096), orbital inclination (P2045), argument of periapsis (P2248), mean anomaly (P2325), longitude of ascending node (P2213)
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Chart by item creation date Minimum and maximum Items with highest numeric value Items with lowest numeric value User:Laboramus/Units/P2233 (Units used) Database reports/Constraint violations/P2233 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 101,604 Main statement 101,601 >99.9% of uses Qualifier 3 <0.1% of uses

[create Create a translatable help page (preferably in English) for this property to be included here]

Units: “kilometre (Q828224), astronomical unit (Q1811), parsec (Q12129)”: value unit must be one of listed. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2233#Units

Scope is as main value (Q54828448): the property must be used by specified way only (Help)

List of violations of this constraint: Database reports/Constraint violations/P2233#Scope, hourly updated report, SPARQL

Conflicts with “subclass of (P279)”: this property must not be used with the listed properties and values. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2233#Conflicts with P279, SPARQL

Type “orbit (Q4130), astronomical object (Q6999), spacecraft (Q40218), spaceflight (Q5916), circumstellar disk (Q3235978)”: item must contain property “instance of (P31)” with classes “orbit (Q4130), astronomical object (Q6999), spacecraft (Q40218), spaceflight (Q5916), circumstellar disk (Q3235978)” or their subclasses (defined using subclass of (P279)). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2233#Type Q4130, Q6999, Q40218, Q5916, Q3235978, SPARQL

Allowed entity types are Wikibase item (Q29934200): the property may only be used on a certain entity type (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2233#Entity types

This property is being used by: it:Template:Corpo celeste, it:Template:Infobox missione spaziale, it:Template:Missione spaziale ru:Шаблон:Спутник be:Шаблон:Спадарожнік, be:Шаблон:Малая планета no:Mal:Infoboks småplanet el:Πρότυπο:Κουτί πληροφοριών πλανήτη, el:Πρότυπο:Πληροφορίες πλανήτη ca:Plantilla:Asteroide, ca:Plantilla:Infotaula d'estel, ca:Plantilla:Infotaula d'objecte astronòmic, ca:Plantilla:Planeta extrasolar, ca:Plantilla:Infotaula satèl·lit, ca:Plantilla:Infotaula d'asteroide, ca:Plantilla:Infotaula vol espacial, ca:Plantilla:Infotaula vol espacial/prova ro:Format:Infocaseta Planetă la:Formula:Capsa asteroidis Vicidata, la:Formula:Capsa satellitis Vicidata pt:Predefinição:Info/Asteroide, pt:Predefinição:Info/Asteroide/Testes cs:Šablona:Infobox - kosmické těleso ast:Plantía:Ficha d'oxetu celeste eu:Txantiloi:Astronomia infotaula, eu:Txantiloi:Objektu astronomiko infotaula es:Plantilla:Ficha de misión espacial, es:Plantilla:Ficha de astronáutica, es:Plantilla:Ficha de astronáutica/zona de pruebas be-x-old:Шаблён:Плянэта ha:Template:Infobox astronomical object incubator:Template:Wp/shi/Infobox astronomical object kab:Talɣa:Infobox astronomical object zh-yue:Template:維基數據行星明細 az:Şablon:Planet 2, az:Şablon:Planet shi:Talɣa:Infobox astronomical object vec:Modeło:Infobox de Voło spasiałe he:תבנית:גוף פלנטרי ga:Teimpléad:WD Bosca Sonraí Taisteal Spáis ary:موضيل:معلومات جرم سماوي, ary:موضيل:معلومات قمر, ary:موضيل:معلومات كوكب, ary:موضيل:معلومات كوكب خارجي, ary:موضيل:معلومات نيزك hu:Sablon:Égitest infobox be-tarask:Шаблён:Плянэта eo:Ŝablono:Informkesto astronomia objekto yue:Template:維基數據行星明細 gv:Clowan:WD Kishtey Fys Arraghey Spoar uk:Шаблон:Комета Please notify projects that use this property before big changes (renaming, deletion, merge with another property, etc.)

of orbit or of any ellipse?

I don't see any hint about orbit in labels (only in descriptions) so why to restrict it to orbits? I propose to use this property for equatorial radius of Earth (Q2) as oppose to polar radius. --Infovarius (talk) 22:28, 27 October 2015 (UTC)

Does the shape of Earth really fit with a perfect ellipse? -- Innocent bystander (talk) 11:02, 28 October 2015 (UTC)

Of course it is not perfect ellipsoid, but ellipsoid is far better approximation than sphere. Besides, Earth's orbit is also not perfect ellipse. --Infovarius (talk) 15:06, 29 October 2015 (UTC)

Agree! But I wonder if this property could be used in an item linked to the value of shape (P1419) instead of directly in Q2?

I mean something like:

In Q2: shape (P1419):QThe shape of Earth
In QThe shape of Earth: semi-major axis of an orbit (P2233):Whatever fit

In that way we could better describe dog-bone-shaped Asteroids, duck-shaped Comets etc... -- Innocent bystander (talk) 15:57, 29 October 2015 (UTC)

apoapsis (P2243) is better for orbit. --Infovarius (talk) 22:48, 12 January 2019 (UTC)

@MER-C, Paperoastro: would you object replacing all P2233 statements with P2243 statements? --Infovarius (talk) 23:32, 12 January 2019 (UTC)

@Infovarius, MER-C:. I'm not agree: 1) semimajor axis and apoapsis are two different elements of an ellipse (see Ellipse); 2) semimajor axis is one of the main elements to define the shape and size of an orbit (see Orbital elements), even if apoapsis can be used in different parametrizations. --Paperoastro (talk) 10:14, 13 January 2019 (UTC)

Ah, yes, sorry. They are different. --Infovarius (talk) 09:31, 14 January 2019 (UTC)

Ok, if everybody mean only orbital semi-axis I change labels according to this. --Infovarius (talk) 21:53, 13 October 2019 (UTC)

Hi @Infovarius: For space, there are distance units that are only used on this occasion. So a radius of a planet (Earth) does not fit into these units. The idea is the same for those who want to use this P for eggs. In addition, there is an idea of the course of an object: the course of the Earth, OK, but not the radius of the Earth.

For apoapside, the center of an ellipse is not necessarily a point of reference: Halley's comet has a P2233 and an apoapside, in relation to the Sun which is its perihelion. —Eihel (talk) 15:59, 14 October 2019 (UTC)