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{{Bharatpedia subcat guideline|notability guideline|astronomical objects|BP:NASTRO}}
{{nutshell
| An astronomical object is notable if it has received significant coverage in [[Bharatpedia:Identifying reliable sources|reliable sources]] that are [[BP:SECONDARY|independent of the scientist(s) who discovered the object or who have a vested interest in its study]].
| Specific criteria are listed to help determine whether an astronomical object meets the notability requirement.
}}

{{Notabilityguide}}

This guideline reflects established [[BP:CONSENSUS|consensus]] about the [[Bharatpedia:Notability|notability]] of [[astronomical object]]s, which is required for them to be the topic of a Bharatpedia article. It is a [[BP:SNG|subject-specific supplement]] to the [[BP:GNG|general notability guideline]], developed by [[BP:AST|Wikiproject Astronomy]].

== Scope ==
This guideline applies to [[astronomical object]]s – naturally occurring [[physical body|physical bodies]], associations, or structures that exist in [[outer space]]. This includes [[galaxy|galaxies]], [[nebula]]e, [[star cluster]]s, [[star system]]s, individual [[star]]s, [[planet]]s, [[minor planet]]s, [[asteroid]]s, [[comet]]s, and [[moon]]s. It also includes bodies of matter that are held together by masses other than their own, such as [[circumstellar disc]]s, [[accretion disc]]s, or [[zodiacal dust]]; regions defined by the [[Large-scale structure of the cosmos#Large-scale structure|large-scale structure]] of the [[Universe]] (e.g. [[galaxy filament]]s and [[cosmic voids]]); and groups that appear solely due to Earth's viewing perspective (e.g. [[asterism (astronomy)|asterism]]s and [[optical double star]]s).

It does not cover artificial objects in space (such as [[artificial satellite]]s or [[spacecraft]]); Earth's [[airspace]]; or extraterrestrial material that has been transported to Earth (such as [[Moon rock]]s, [[meteor shower]]s and [[meteorite]]s). Nor does this guideline apply to fictional objects, such as those that appear in [[science fiction]]. Candidate objects or those which are the subject of serious scientific hypothesis are [[#Hypothetical objects|discussed below]].

== Establishing notability ==

On Bharatpedia, 'notable' means 'worthy of notice'; it is not synonymous with 'famous' or 'important'. Astronomical objects are notable if they have received substantial attention and coverage in [[BP:Identifying reliable sources|reliable sources]], usually the scientific literature and/or popular media. Famous astronomical objects have readily available [[BP:Verifiability|verifiable]] information from reliable sources that indicate notability; however, more obscure objects can still be notable.

Coverage must be specific and substantial: notability is not ensured just because an object is listed in a [[scientific paper]] or included in a large-scale [[astronomical survey]]. To establish notability, the astronomical object must have ''significant commentary'' in reliable sources, such as being one of the primary targets of a study with in-depth discussion (beyond discovery and basic parameters).

Being listed in a database does not make an object notable. Some astronomical databases and surveys, such as the [[JPL Small-Body Database]], [[SIMBAD]] or the [[Gaia_(spacecraft)#Data_releases|''Gaia'' catalogue]], list millions<ref>{{cite web|url=http://ssd.jpl.nasa.gov/?body_count|title=How Many Solar System Bodies|publisher=[[JPL Small-Body Database]]|access-date=2021-05-10}}</ref><ref>{{cite web|url=http://simbad.u-strasbg.fr/guide/simbad.htx|title=What is SIMBAD?|publisher=[[Centre de données astronomiques de Strasbourg]]|access-date=2021-05-10}}</ref> or billions<ref>{{cite Gaia EDR3}}</ref> of objects. Many objects listed in catalogues and databases have little information beyond their basic parameters and discovery circumstances. Bharatpedia [[BP:NOTDIR|does not duplicate content]] in these databases.

=== No inherent notability ===

Notability is determined solely by coverage in reliable sources, not whether editors personally believe an astronomical object is important. Just because an astronomical object [[Bharatpedia:Existence ≠ Notability|exists in space]] does not mean it is necessarily notable i.e. there is no ''inherent'' notability without coverage in reliable sources.

On Earth, [[Bharatpedia:GEOLAND|named geographical features are generally notable]]. This is [[Bharatpedia:Outcomes#Geography and astronomy|not true for astronomical objects]]: the naming of a body in space (such as an asteroid) does not guarantee notability. This is because the likelihood that a general reader would search Bharatpedia for an arbitrary astronomical object is much lower than for a geographic feature on Earth. For example, if a [[minor planet]] has received an official name from the [[Committee for Small Body Nomenclature]], this does not necessarily mean that object is notable. If an astronomical object has been named but is not notable, it could still be included in a suitable [[BP:LISTS|list of similar objects]].

=== No inherited notability ===

For the purposes of establishing notability, coverage must be of the astronomical object itself, not other things that may be related to it. Merely being associated with another notable topic does not mean the object itself is notable, i.e. there is [[BP:ITSA|no ''inherited'' notability]].

For example, if an object was discovered by a famous astronomer, that does not necessarily make it notable. Nor does being [[#Objects named after famous individuals or characters|named after something notable]] make the object itself notable. If the individual object has received insufficient coverage in [[Bharatpedia:Independent sources|independent sources]], then it is not notable even if similar objects are often notable.

== Criteria ==
{{shortcut|BP:NASTCRIT}}
If an astronomical object meets ''any'' of the following criteria, it is presumed notable:

# {{anchor|C1}} The object is, or has been, visible to the naked eye.<ref name="nakedEyeVisible" group=note>
[[Limiting_magnitude#In_naked-eye_visibility|Naked eye visibility]] varies between observers and locations. For the purpose of this guideline, it is defined as a visual magnitude of 6.0 or brighter. Beware that stars fainter than magnitude 5.0 often lack significant coverage, and thus may not satisfy [[BP:GNG]].</ref> This includes any star in the [[Bright Star Catalogue|HR catalogue]].
# {{anchor|C2}} The object is listed in a catalogue of high historical importance (e.g. [[Messier catalogue]]), or a catalogue of high interest to amateur astronomers (e.g. [[Caldwell catalogue]]).
#* Being listed in comprehensive databases (e.g. [[SIMBAD]] or [[NASA/IPAC Extragalactic Database|NED]]) or surveys (e.g. [[2MASS]] or [[2dFGRS]]) isn't enough for notability.
# {{anchor|C3}} The object has been the subject of multiple non-trivial published works, which contain ''significant commentary'' on the object. This includes published works in all forms, such as newspaper articles, books, television documentaries and articles in peer-reviewed scientific journals.
#* A single paper is not enough to establish notability. Being mentioned alongside other similar objects, such as in a table of properties of 200 newly discovered supernovae, does not constitute non-trivial coverage.
# {{anchor|C4}} The object was discovered before 1850, prior to the use of [[astrophotography]] or automated technology.{{#tag:ref|The first photograph of a star (other than the Sun) was obtained in 1850.<ref>{{cite web|url=https://hco.cfa.harvard.edu/facilities/GreatRefractor|title=The Great Refractor|publisher=[[Harvard College Observatory]]|access-date=2021-05-18|quote=In 1850 [...] the first daguerreotype ever made of a star, the bright Vega, was taken by J.A. Whipple working under W.C. Bond}}</ref> The first asteroid discovered photographically was [[323 Brucia]] in 1891.|group=note}}

Whether an object meets these criteria must be established through ''[[BP:Independent sources|independent]]'' [[Bharatpedia:Reliable sources|reliable sources]], following [[BP:NRV]]. This means independent of the scientist(s) who discovered the object, or others who may have a [[BP:COI|conflict of interest]] in promoting it. Sources generated by the discoverers may be used as references for factual information in the article, but they cannot be used to establish notability. See [[#Finding sources|guidance below on finding sources]].

== Failing all criteria ==

=== Notable for other reasons ===
If an astronomical object meets none of these criteria, it ''could'' still be notable for other non-astronomical reasons e.g. as a literary topic. Such cases should follow the [[BP:GNG|general notability guideline]].

=== Inclusion in another article or list ===
{{shortcut|BP:NASTHELP}}
If an astronomical object is not notable, so cannot have its own article, a few sentences about the object might be useful in another article or it could be included in a [[BP:LIST|list]].

* Appropriate information can be [[Bharatpedia:Merging|merged]] into a broader article. Mergers should be proposed and discussed to establish consensus before being implemented. Place a {{tl|merge to}} tag on the page, indicating the page where the article may be merged, and start a section in the ''target'' article's talk page to discuss the proposed merge.
* If the information is more appropriate to being incorporated into an existing list (see [[lists of astronomical objects]]), then a) ensure there is an entry for the object included in the list, adding one if necessary; and b) create a [[Help:Redirect|redirect]] from the name of the object to the list. (For minor planets, see [[#Dealing with minor planets|dealing with minor planets]] below.)
* If no article or list currently exists into which the astronomical object can be incorporated, consider writing one yourself or submit a [[Bharatpedia:Requested articles|request]] for it. Such lists are still subject to Bharatpedia's content policies, such as [[BP:V|verifiability]] and [[BP:NOR|no original research]].

Astronomical objects that are part of a hierarchy of objects, such as a [[planetary system]] or [[star system]], can often be beneficially merged into the article about the wider system or hosting object. For example, if there are several exoplanets orbiting a single star, they could be discussed in a section of the article on the host star, rather than each planet having a separate article. Content included in a broader article is [[BP:NNC|not subject to the same notability criteria]] as stand-alone articles; instead it is governed by the principles of [[BP:DUE|due weight]] and the general [[:Category:Bharatpedia content policies|content policies]].

=== Deletion ===
If none of the criteria are met, the object isn't notable for other reasons, and there is no suitable target for a merger, deletion may be necessary. See the [[BP:DELETE|deletion policy]] for further steps.

When nominating an article for deletion (via either the [[Bharatpedia:Proposed deletion|PROD]] or [[Bharatpedia:Articles for deletion|AfD]] process), please place <code><nowiki>{{WikiProject Astronomy|object=yes}}</nowiki></code> at the top of its talk page, as well as any other relevant Wikiproject templates (e.g. <code><nowiki>{{WikiProject Physics}}</nowiki></code> for an object which is of particular interest to physics). This will notify [[BP:AST|WikiProject Astronomy]] via [[BP:AALERTS]] that the article is being considered for deletion. If using the AfD process, you can also tag the deletion discussion with <code><nowiki>{{subst:delsort|Astronomy|~~~~}}</nowiki></code>, which will list the discussion at [[Bharatpedia:WikiProject Deletion sorting/Astronomy]].

==Appendix==

=== Finding sources ===
Many astronomical objects have more than one valid name or catalogue designation, see [[astronomical naming conventions]]. When searching for sources, try using alternative identifiers or standard abbreviations e.g. 'kap Cep' or 'HR 7750' for [[Kappa Cephei]], or 'NGC 2392' for the [[Eskimo Nebula]].

There are several astronomy-specific search engines which can be consulted:
* The [[Astrophysics Data System]] (ADS) [https://ui.adsabs.harvard.edu/classic-form abstract service] lists almost all published papers and preprints in astronomy, and many conference proceedings and textbooks too. Links are provided to the published source and any freely-available version (such as a preprint or scanned version of older sources). Put the name of the object(s) in quotes and place it in the 'abstract/keyword' box.
* The [[SIMBAD]] [http://simbad.u-strasbg.fr/simbad/ database] provides information on millions of astronomical objects outside the Solar System, including basic properties, alternative designations, and a bibliography. Coverage is best for objects within the [[Milky Way]], with less complete coverage of extragalactic sources. Try a search by identifier, or by coordinates, then click 'display' in the 'references' section. Clicking on any of the entries will provide links to the published paper and/or the relevant ADS entry.
* The [[NASA/IPAC Extragalactic Database]] ([http://ned.ipac.caltech.edu/ NED]) contains information on extragalactic objects, for which it is more comprehensive than SIMBAD. Try a search by identifier, or by coordinates, then click on the 'references' tab. You can then either click the 'view references on ADS' button, or click on a specific reference and then 'search ADS' to go to the ADS record.

There is no equivalent to SIMBAD or NED for objects within the Solar System.<ref group=note>The [[Minor Planet Center]] database and the [[JPL Small Body Database]] provide raw observations, orbital data, names and designations, but do not list all sources that mention the object or provide links to their references.</ref>

=== Mass creation ===
Per [[BP:MASSCREATION]], the systematic creation of articles on astronomical objects based on information retrieved from various astronomical databases should be discussed at [[WT:ASTRO]] first.

=== Hypothetical objects ===
Candidate astronomical objects, or those proposed by a serious scientific hypothesis, are notable only if they have received substantial commentary in multiple independent reliable sources, per [[#C3|criterion 3]]. Any article about the object must explicitly state that it is hypothetical or a candidate, unless/until confirmed by multiple independent reliable sources. Care should be taken with popular media sources based upon a [[press release]] issued by the discoverer or proposer, as they might not be independent (see [[churnalism]]). Substantial original journalism and/or comments from independent experts are necessary to establish the notability of hypothetical or candidate objects.

=== {{anchor|Dealing with minor planets}}Dealing with minor planets ===
{{Shortcut|BP:DWMP|BP:AST2000}}
Before 2012, when this notability guideline did not yet exist, approximately 20,000 asteroid stubs were mass-created by [[BP:Bots|bots]] and human editors. This created a considerable backlog of articles to be cleaned up, redirected, merged, or deleted. To not overly burden the community, editors should not nominate more than 10 asteroids a day to [[BP:AFD|AfD]] for discussion.

[[Bharatpedia talk:Notability (astronomical objects)/Archive 4#Proposed changes|By consensus]], asteroids [[Minor planet designation|numbered]] below [[2000 Herschel|2000]] should be discussed before re-directing. For asteroids numbered above 2000, if an article of questionable notability is found, '''and''' a good-faith search has failed to locate references establishing notability, then it is appropriate to redirect the article to the corresponding [[:Category:Lists of minor planets by number|list of minor planets]], keeping the original categories and {{tlf|DEFAULTSORT}} information. For best results, the redirect should use {{tl|NASTRO comment}} and target the specific entry on the list article.

For example, suppose you want to create a redirect to the minor-planet entry ''{{-r|57658 Nilrem}}'' on the [[List of minor planets: 57001–58000]] article. This minor planet is found at the anchor <code>#658</code> on the list page. Hence, a redirect can be created with the following content:
{{pre|<nowiki>
#REDIRECT [[List of minor planets: 57001–58000#658]]

{{NASTRO comment}}

{{DEFAULTSORT:Nilrem}}
[[Category:Background asteroids|057658]]
[[Category:Discoveries by Michel Ory]]
[[Category:Minor planets named for people]]
[[Category:Named minor planets]]
[[Category:Astronomical objects discovered in 2001|20011017]]
</nowiki>
}}

The template {{tl|Anchor}} can be used to create a stable anchor point for a redirect.

=== Examples ===

==== Extrasolar planets ====
[[HAT-P-40 b|HAT-P-40 b]] is a [[hot Jupiter]] [[exoplanet]]. Its discovery was announced in 2012 by the [[HATNet Project]] in a paper on three new discoveries.<ref>{{cite journal|arxiv=1207.3344|title=HAT-P-39b–HAT-P-41b: Three Highly Inflated Transiting Hot Jupiters|year=2012|bibcode=2012AJ....144..139H|last1=Hartman|first1=J. D.|display-authors=etal|journal=The Astronomical Journal|volume=144|issue=5|page=139|doi=10.1088/0004-6256/144/5/139|s2cid=118457589}}</ref> It has been included in several large catalogues and databases,<ref>{{cite web|url=http://exoplanet.eu/catalog/hat-p-40_b/|title=Planet HAT-P-40 b|website=[[Extrasolar Planets Encyclopaedia]]}}</ref><ref>{{cite simbad|title=HAT-P-40b}}</ref> and included in a list of possible targets for follow-up<ref>{{cite journal|bibcode=2016PASP..128i4401S|title=Transiting Exoplanet Studies and Community Targets for JWST's Early Release Science Program|last1=Stevenson|first1=Kevin B.|display-authors=etal|journal=[[Publications of the Astronomical Society of the Pacific]]|volume=128|issue=967|page=094401|date=2016|doi=10.1088/1538-3873/128/967/094401|arxiv=1602.08389}}</ref> (where it was given the lowest priority). However, as of 2018, none of those sources provide any significant commentary on this particular exoplanet beyond the initial discovery paper. There have been no observations by other teams of astronomers, nor has there been any coverage in the popular media. The object exists, but does not meet any of the criteria above so does not have an article on Bharatpedia; instead it has a one-line entry in the [[List of exoplanets discovered in 2012]]. The host star ([[TYC 3607-1028-1]]) is not independently notable either, so also doesn't have an article.

[[Gliese 1214 b]] was discovered in 2009 by the [[MEarth Project]];<ref>{{cite journal|bibcode=2009Natur.462..891C|title=A super-Earth transiting a nearby low-mass star|last1=Charbonneau|first1=David|display-authors=etal|journal=[[Nature (journal)|Nature]]|volume=462|issue=7275|page=891|date=2009|doi=10.1038/nature08679|arxiv=0912.3229}}</ref> it was one of the first known [[super Earth]] exoplanets. There have been numerous studies by other teams of astronomers devoted to just this object,<ref>{{cite simbad|title=G 139-21b}}</ref> several of which have been reported in the popular media.<ref>{{cite web|url=https://www.google.co.uk/search?tbm=nws&q=gj+1214b&oq=gj+1214b|website=[[Google News]]|title=gj 1214b}}</ref> It easily passes [[#C3|the third criterion]], so is notable and has a stand-alone article.

==== Minor planets ====
The asteroid {{LoMP |182016 |{{mp|(182016) 1999 XF|255}} }} [https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=182016#content is listed] in the [[JPL Small-Body Database]] and [https://minorplanetcenter.net/db_search/show_object?object_id=182016 by the] [[Minor Planet Center]]. However, it does not appear in searches for additional references. The asteroid exists, but has received no substantial commentary, or study beyond refining its orbit. Information about this object is therefore included in the corresponding [[:Category:Lists of minor planets by number|list of minor planets]], not a stand-alone article.

[[532 Herculina]] is another asteroid. It has received multiple follow-up studies, by teams of astronomers unrelated to the discoverer, including an observation by the [[Hubble Space Telescope]]. Independent references provide substantial commentary on its shape and discussion of a possible [[asteroid moon]]. It is therefore notable and has a stand-alone article.

==== Objects named after famous individuals or characters ====
The notability of astronomical objects is [[BP:INHERIT|not inherited]] from any famous individual or mythological character they may be named after. If a non-notable asteroid is named after a notable person or character, it may be appropriate to include this information ''in the article about the person or character''.

For example, the asteroid [[165347 Philplait]] was named after [[Phil Plait]], a notable astronomer, but the asteroid does not meet the criteria above. Instead, [[165347 Philplait]] redirects to {{Section link|List of minor planets: 165001–166000|347}} and the naming of the asteroid is mentioned at {{Section link|Phil Plait|Awards and honors}}. The asteroid is {{MoMP|165347|also included}} in the list article [[meanings of minor planet names]].

If an object is notable under the criteria above, then the origin of its name should be explained in its article. An example is [[45 Eugenia]], which is named after the Empress [[Eugénie de Montijo]] but is notable for other reasons.

== See also ==
* [[Bharatpedia:Naming conventions (astronomical objects)]]
* [[Bharatpedia:Citing sources]]
* [[Bharatpedia:Identifying reliable sources]]
* [[Bharatpedia:Search engine test]]
* [[Bharatpedia:Verifiability]]

== Notes and references ==

=== Notes ===
{{reflist|group=note}}

=== References ===
{{reflist|30em}}

[[Category:Science Bharatpedia administration|notability, astronomical]]

Bharatpedia:Notability (astronomical objects) - Revision history

ImportMaster at 22:55, 14 November 2021