Property talk:P1458

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color index
color index of an astronomical object

Description	Color index of a star - color index (Q271860). Qualify each value with astronomical filter (P1227) to indicate the corresponding color bands.
Represents	color index (Q271860)
Data type	Quantity
Template parameter	en:template:Starbox character u-b, b-v, v-r, r-i, j-h, j-k
Domain	According to this template: instances of astronomical object (Q6999) According to statements in the property: astronomical object (Q6999) When possible, data should only be stored as statements
Allowed values	real numbers, qualified with astronomical filter (P1227) with any spectral band (Q2882278) pair used in the UBV photometric system (Q129833) (such as B-V colour (Q2668836), see this list of all allowed pairs) (note: this should be moved to the property statements)
Example	Aldebaran color index => 1.54 + qualified with astronomical filter (P1227) => B-V colour (Q2668836) 1.90 + qualified with astronomical filter (P1227) => U-B colour (Q17773035) (note: this information should be moved to a property statement; use property Wikidata property example (P1855), Wikidata property example for properties (P2271), Wikidata property example for lexemes (P5192), Wikidata property example for forms (P5193) or Wikidata property example for senses (P5977))
Source	According to this template: the color index can be found in scientific literature, but also in some astronomical databases (see for example SIMBAD) According to statements in the property: https://simbad.u-strasbg.fr/simbad When possible, data should only be stored as statements
Tracking: usage	Category:Pages using Wikidata property P1458 (Q89187817)
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) Minimum and maximum Items with highest numeric value Items with lowest numeric value Database reports/Constraint violations/P1458 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 66 Main statement 66 100% of uses

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

Type “astronomical object (Q6999)”: item must contain property “instance of (P31)” with classes “astronomical object (Q6999)” 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/P1458#Type Q6999, SPARQL

Multi value: this property generally contains two or more 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/P1458#Multi value, SPARQL

Required qualifier “astronomical filter (P1227)”: this property should be used with the listed qualifier. (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/P1458#mandatory qualifier, SPARQL

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/P1458#Scope, hourly updated report, SPARQL

Distinct values: this property likely contains a value that is different from all other items. (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/P1458#Unique value, SPARQL (every item), SPARQL (by value)

This property is being used by: no:Mal:SammenlignFargeindeks hy:Կաղապար:Տեղեկաքարտ Աստղ ru:Шаблон:Звезда ca:Plantilla:Infotaula satèl·lit Please notify projects that use this property before big changes (renaming, deletion, merge with another property, etc.)

Creating spectral band pairs

@Paperoastro: need to create other items like B-V colour (Q2668836). LaddΩ chat ;) 03:21, 1 September 2014 (UTC)

@Laddo: here there is the list. ;-) --Paperoastro (talk) 13:45, 1 September 2014 (UTC)

@Paperoastro: Thanks! Updated doc & constraints. LaddΩ chat ;) 16:58, 1 September 2014 (UTC)

Which qualifier ?

Property_talk:P1227 suggests that astronomical filter (P1227) should be used as qualifier for color index; I initially thought that determination method (P459) would be appropriate. As I have no preference, someone more familiar with the domain should identify which qualifier is the best and we should document it ASAP: either fix the documentation above, or the documentation on Property_talk:P1227. LaddΩ chat ;) 17:13, 1 September 2014 (UTC)

It could be an idea, but I read the discussions concerning determination method (P459), and for me it is better astronomical filter (P1227).

What do you think about it Zolo? --Paperoastro (talk) 20:55, 1 September 2014 (UTC)

I do not really know what astronomical filters are supposed to do. As a comparison, I would say:

1. if something is dated as 2000 BC with carbon 14, it should be determiniation method : Carbon 14 (different methods may give different results but only one date is actually correct).
2. if you say: this is year 2014 in the Christian Calendar, "Christian Calendar" is not the "determination method", it it more something like "frame of reference" or "measurement unit" (year 1435 in the Muslim calendar would be equally correct).

I would think that astronomical filter is more like case B). Aldebaran color index 1.54 (B-V colour) and 1.90 U-B colour are both equally correct, so in that case determination method (P459) should not be used. --Zolo (talk) 08:15, 2 September 2014 (UTC)

OK for astronomical filter (P1227), did the change in documentation. LaddΩ chat ;) 00:24, 3 September 2014 (UTC)