About: 57 Cygni

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57 Cygni is a close binary star system in the constellation Cygnus, located about 530 light years from Earth. It is visible to the naked eye as a blue-white hued star with a baseline apparent visual magnitude of 4.80. The pair have a magnitude difference of 0.34. This system is moving closer to the Earth with a heliocentric radial velocity of −21 km/s.

Attributes	Values
rdf:type	Thing place dbo:Location schema:Place celestial body yago:WikicatB-typeMain-sequenceStars yago:CelestialBody109239740 yago:NaturalObject100019128 yago:Object100002684 yago:PhysicalEntity100001930 star yago:Star109444100 yago:Whole100003553 yago:WikicatFlamsteedObjects
rdfs:label	57 Cygni (en) 57 Cygni (sv) 天津增卅二 (zh)
rdfs:comment	57 Cygni, som är stjärnans Flamsteed-beteckning, är en snäv dubbelstjärna belägen i den mellersta delen av stjärnbilden Svanen. Den har en lägsta skenbar magnitud på ca 4,80 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 6,2 mas, beräknas den befinna sig på ett avstånd på ca 530 ljusår (ca 161 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet av ca -21 km/s. (sv) 天鵝座57，又名BD+43 3755，HD 199081、SAO 50180、HR 8001，是天鵝座的一颗恒星，视星等为4.78，位于銀經84.9，銀緯-0.19，其B1900.0坐标为赤經20h 49m 42.5s，赤緯+44° -0.19′ 31″。 (zh) 57 Cygni is a close binary star system in the constellation Cygnus, located about 530 light years from Earth. It is visible to the naked eye as a blue-white hued star with a baseline apparent visual magnitude of 4.80. The pair have a magnitude difference of 0.34. This system is moving closer to the Earth with a heliocentric radial velocity of −21 km/s. (en)
foaf:name	57 Cygni (en)
dcterms:subject	B-type main-sequence stars Bright Star Catalogue objects Cygnus (constellation) Durchmusterung objects Flamsteed objects Henry Draper Catalogue objects Hipparcos objects Spectroscopic binaries Suspected variables
Wikipage page ID	36847391 (xsd:integer)
Wikipage revision ID	1079521511 (xsd:integer)
Link from a Wikipage to another Wikipage	Binary star Argument of periapsis Stellar classification B-type main-sequence stars Bright Star Catalogue objects Cygnus (constellation) Durchmusterung objects Flamsteed objects Henry Draper Catalogue objects Hipparcos objects Spectroscopic binaries Suspected variables Constellation Light year Orbital period Cygnus (constellation) Eclipsing binary B-type main-sequence star Spectroscopic binary Apparent visual magnitude Apsidal period Orbital eccentricity Radial velocity Orbital inclination
sameAs	57 Cygni 57 Cygni 57 Cygni 57 Cygni 57 Cygni 57 Cygni 57 Cygni
dbp:wikiPageUsesTemplate	dbt:Reflist dbt:Short_description dbt:Starbox_astrometry dbt:Starbox_begin dbt:Starbox_catalog dbt:Starbox_character dbt:Starbox_detail dbt:Starbox_end dbt:Starbox_observe dbt:Starbox_orbit dbt:Starbox_reference dbt:Use_dmy_dates dbt:Val dbt:DEC dbt:Odlist dbt:RA dbt:Stars_of_Cygnus
absmag v	−1.23 (en)
appmag v	4.800000 (xsd:double)
class	B5 V (en)
component	57 (xsd:integer)
constell	Cygnus (constellation)
epoch	J2000 (en)
inclination	≈ 48 (en)
k	111.900000 (xsd:double) 126 (xsd:integer)
p error	0.220000 (xsd:double)
parallax	6.210000 (xsd:double)
periarg	159.600000 (xsd:double)
periastron	2441571.275000 (xsd:double)
period unitless	246654.72000000003 (second)
prop mo dec	−2.08 (en)
prop mo ra	+11.94 (en)
rotational velocity	30 (xsd:integer) 40 (xsd:integer)
temperature	17190 (xsd:integer)
has abstract	57 Cygni is a close binary star system in the constellation Cygnus, located about 530 light years from Earth. It is visible to the naked eye as a blue-white hued star with a baseline apparent visual magnitude of 4.80. The pair have a magnitude difference of 0.34. This system is moving closer to the Earth with a heliocentric radial velocity of −21 km/s. This is a double-lined spectroscopic binary with an orbital period of 2.85 days and an eccentricity of 0.15. They show a steady change in their longitude of periastron, showing an apsidal period of 203±4 years. The system does not form an eclipsing binary, having the orbital inclination of around 48°. Both components are B-type main-sequence stars with a stellar classification of B5 V. (en)

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