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Statements

Subject Item
dbr:3_Gem
dbo:wikiPageWikiLink
dbr:3_Geminorum
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Subject Item
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rdf:type
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rdfs:label
3 Geminorum 3 Близнецов 雙子座3 3 Geminorum
rdfs:comment
3 Geminorum is a blue supergiant star in the constellation Gemini. It is a small amplitude pulsating variable and a close double star, with a mean combined apparent visual magnitude of about 5.7. 3 Geminorum was found to be an α Cygni variable in 1998 and given the designation PU Geminorum. It varies by a few tenths of a magnitude with a main period of 6.807 days and a secondary period of 25 days. 3 Близнецов (лат. 3 Geminorum), PU Близнецов (лат. PU Geminorum), HD 42087 — тройная звезда в созвездии Близнецов на расстоянии приблизительно 6 765 световых лет (около 2 075 парсек) от Солнца. 3 Geminorum, som är stjärnans Flamsteed-beteckning, är en snäv dubbelstjärna belägen i den mellersta delen av stjärnbilden Tvillingarna, som också har variabelbeteckningen PU Geminorum. Den har en lägsta kombinerad skenbar magnitud på ca 5,75 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 0,23 mas, beräknas den befinna sig på ett avstånd på ca 14 200 ljusår (ca 4 350 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet av ca 16 km/s. 雙子座3，又名BD+23 1226，HD 42087、SAO 78050、HR 2173，是雙子座的一颗恒星，视星等为5.75，位于銀經187.75，銀緯1.77，其B1900.0坐标为赤經6h 3m 39.6s，赤緯+23° 1.77′ 47″。
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3 Geminorum
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dbc:Objects_with_variable_star_designations dbc:Flamsteed_objects dbc:Gemini_(constellation) dbc:Bright_Star_Catalogue_objects dbc:Alpha_Cygni_variables dbc:Henry_Draper_Catalogue_objects dbc:B-type_supergiants dbc:Durchmusterung_objects dbc:Hipparcos_objects
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1123780955
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dbp:absmagV
−6.26
dbp:appmagV
5.71
dbp:bV
+0.21
dbp:class
B3Ia
dbp:constell
dbr:Gemini_(constellation)
dbp:epoch
J2000.0
dbp:gravity
2.45
dbp:luminosity
204000
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21
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0.0616
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0.3878
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−2.685
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dbo:abstract
雙子座3，又名BD+23 1226，HD 42087、SAO 78050、HR 2173，是雙子座的一颗恒星，视星等为5.75，位于銀經187.75，銀緯1.77，其B1900.0坐标为赤經6h 3m 39.6s，赤緯+23° 1.77′ 47″。 3 Близнецов (лат. 3 Geminorum), PU Близнецов (лат. PU Geminorum), HD 42087 — тройная звезда в созвездии Близнецов на расстоянии приблизительно 6 765 световых лет (около 2 075 парсек) от Солнца. 3 Geminorum is a blue supergiant star in the constellation Gemini. It is a small amplitude pulsating variable and a close double star, with a mean combined apparent visual magnitude of about 5.7. 3 Geminorum was found to be an α Cygni variable in 1998 and given the designation PU Geminorum. It varies by a few tenths of a magnitude with a main period of 6.807 days and a secondary period of 25 days. 3 Geminorum is also a close double star. The brighter component is the variable blue supergiant. The companion is 2.5 magnitudes fainter. The separation is about 0.6 arc-seconds. There is also a much fainter, approximately 14th magnitude, star 14" away. Faint Hα emission lines have been detected in the spectrum of 3 Geminorum, but this is not usually expressed in published spectral classifications. An "e" is only occasionally appended to the spectral type to reflect the emission lines. 3 Geminorum has frequently been classified as a normal supergiant (luminosity class Ib), although a bright supergiant (Ia) luminosity class is now preferred. 3 Geminorum can be occulted by the Moon. Observations of these occultations can give information about the angular diameter of a star, or about close companions. Occultations of 3 Geminorum have been observed, but no double or diameter information has been published. 3 Geminorum, som är stjärnans Flamsteed-beteckning, är en snäv dubbelstjärna belägen i den mellersta delen av stjärnbilden Tvillingarna, som också har variabelbeteckningen PU Geminorum. Den har en lägsta kombinerad skenbar magnitud på ca 5,75 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 0,23 mas, beräknas den befinna sig på ett avstånd på ca 14 200 ljusår (ca 4 350 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet av ca 16 km/s.
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