Castor (star)

Castor is the second brightest object in the zodiac constellation of Gemini. It has the Bayer designation α Geminorum, which is Latinised to Alpha Geminorum and shortened to Alpha Gem or α Gem. It has an apparent visual magnitude of 1.93, which makes it one of the brightest stars in the night sky. Castor appears as a single star to the naked eye, but it is actually a sextuple star system (six stars) organized into three binary pairs of stars designated Castor A, Castor B and Castor C, each containing two stars. Even though it is the 'α' (alpha) member of the constellation, it is fainter than 'β' (beta) Geminorum, Pollux.

Infographic representation of the Castor star system, and with a size comparison of all the stars with the Sun

Stellar system

Castor is a multiple star system made up of six different stars; there are three visual stars, all of which are spectroscopic binaries. Appearing as a single star to the naked eye, Castor was first recorded as a double star in 1718 by James Pound, but it may have been changed into at least two sources of light by Cassini as early as 1678. The separation between the binary systems Castor A and Castor B has increased from about 2″ (2 arcseconds of angular measurement) in 1970 to about 6″ in 2017.[1] [2] These stars have magnitudes of 1.9 and 3.0, respectively.

Castor Aa and Ba both have orbits of a few days with a much fainter star.

Castor C, or YY Geminorum, was discovered to change in brightness with a regular period. It is an eclipsing binary with additional changes due to areas of different brightness on the surface of one or both stars, as well as irregular flares.[3] The Castor C stars orbit in less than a day. Castor C is believed to be in a orbit around Castor AB, but with an extremely long period of several thousand years. It is 73″ distant from the bright stars in the system[2]

The combined apparent magnitude of all six stars is +1.58.

References

  1. ↑ Heintz, W.D. (1980). "Micrometer observations of double stars and new pairs – Part Ten". The Astrophysical Journal Supplement Series. 44: 111. Bibcode:1980ApJS...44..111H. doi:10.1086/190686. ISSN 0067-0049.
  2. ↑ 2.0 2.1 Tokovinin, A.A. (1997). "MSC: A catalogue of physical multiple stars". Astronomy and Astrophysics Supplement Series. 124 (1): 75–84. Bibcode:1997A&AS..124...75T. doi:10.1051/aas:1997181. ISSN 0365-0138.
  3. ↑ Torres, Guillermo; Ribas, Ignasi (2002). "Absolute dimensions of the M‐type eclipsing binary YY Geminorum (Castor C): A challenge to evolutionary models in the lower Main Sequence". The Astrophysical Journal. 567 (2): 1140–1165. arXiv:astro-ph/0111167. Bibcode:2002ApJ...567.1140T. doi:10.1086/338587. ISSN 0004-637X. S2CID 16780943.

Read other articles:

Keuskupan Ciego de Ávila

Keuskupan Ciego de AvilaDioecesis Caeci AbulensisKatolik Katedral Ciego de ÁvilaLokasiNegara KubaProvinsi gerejawiProvinsi CamagüeyStatistikLuas7.887 km2 (3.045 sq mi)Populasi- Total- Katolik(per 2006)452.100186,900 (41.3%)Paroki4InformasiDenominasiKatolik RomaRitusRitus LatinPendirian10 Desember 1912 (111 tahun lalu)KatedralCatedral de San Eugenio de la PalmaKepemimpinan kiniPausFransiskusEmeritusMario Eusebio Mestril Vega Keuskupan Ciego de Avila ad...

 

 

List of volcanoes in New Zealand

See also: Volcanism of New Zealand and Lists of volcanoes This is a partial list of active, dormant, and extinct volcanoes in New Zealand. Kermadec Arc and Havre Trough Name Elevation Location Last eruption metres feet Coordinates Brothers Seamount -1350 -4400 34°52′30″S 179°04′30″E / 34.875°S 179.075°E / -34.875; 179.075 (Brothers) - Clark Seamount -860 -2800 36°26′46″S 177°50′20″E / 36.446°S 177.839°E / -36.446...

 

 

Aulne

Artikel ini sebatang kara, artinya tidak ada artikel lain yang memiliki pranala balik ke halaman ini.Bantulah menambah pranala ke artikel ini dari artikel yang berhubungan atau coba peralatan pencari pranala.Tag ini diberikan pada April 2012. Untuk biara di Belgia, lihat Biara Aulne. Aulne adalah sebuah sungai sepanjang 140 km di bagian Barat Prancis, mengalir ke bukit Bretagne Prancis dan masuk ke pelabuhan Brest, salah satu teluk fjord di selatan Brest. Sungai ini adalah bagian dari Ca...

羅生門 (電影)

本條目存在以下問題，請協助改善本條目或在討論頁針對議題發表看法。 此條目需要补充更多来源。 (2018年3月17日)请协助補充多方面可靠来源以改善这篇条目，无法查证的内容可能會因為异议提出而被移除。致使用者：请搜索一下条目的标题（来源搜索：羅生門 (電影) — 网页、新闻、书籍、学术、图像），以检查网络上是否存在该主题的更多可靠来源（判定指引）。 �...

 

 

البطولات الوطنية الأمريكية 1889 (كرة مضرب)

هذه المقالة تحتاج للمزيد من الوصلات للمقالات الأخرى للمساعدة في ترابط مقالات الموسوعة. فضلًا ساعد في تحسين هذه المقالة بإضافة وصلات إلى المقالات المتعلقة بها الموجودة في النص الحالي. (أغسطس 2023) البطولات الوطنية الأمريكية 1889 رقم الفعالية 9  البلد الولايات المتحدة  الت�...

 

 

Creation and evolution in public education

Status of creation and evolution in public education Part of a series onCreationism History Types Young Earth Time dilation creationism Old Earth day-age gap progressive Neo-creationism Biblical cosmology Book of Genesis creation narrative framework interpretation as an allegory Omphalos hypothesis Creation science Created kind Flood geology Creationist cosmologies Intelligent design Rejection of evolution by religious groups History Public education Teach the Controversy Religious views Non-...

Campionato Dilettanti 1958-1959

Campionato Nazionale Dilettanti1958-1959 Competizione Campionato Dilettanti Sport Calcio Edizione 2ª Organizzatore FIGCLeghe Regionali Luogo  Italia Partecipanti 571 Formula 36 gironi Risultati Vincitore Mobilieri Cascina(1º titolo) Promozioni 19 (ma solo 12 accettate) Retrocessioni Variabile (in genere 2 per girone) Cronologia della competizione 1957-1958 1959-1960 Manuale Il Campionato Nazionale Dilettanti 1958-1959 è stato il quinto livello del campionato italiano di calcio, il pr...

 

 

Monas (bishop of Milan)

MonasBishop of Milanrelics of Saint Monas, Cathedral of MilanChurchCatholic ChurchIn officeend 3rd – early 4th centuryPredecessorCalimeriusSuccessorMiroclesSainthoodFeast day12 OctoberVenerated inCatholic Church Monas (Italian: Mona) was Bishop of Milan from the end 3rd-century to early 4th-century. He is honoured as a Saint in the Catholic Church and his feast day is on October 12.[1] Life Almost nothing is known about the life and the episcopate of Monas. He was elected as bis...

 

 

2012 United States presidential election in North Dakota

Election in North Dakota Main article: 2012 United States presidential election 2012 United States presidential election in North Dakota ← 2008 November 6, 2012 2016 →   Nominee Mitt Romney Barack Obama Party Republican Democratic–NPL Home state Massachusetts Illinois Running mate Paul Ryan Joe Biden Electoral vote 3 0 Popular vote 188,163 124,827 Percentage 58.32% 38.69% County Results Romney   40-50%   50-60%   6...

Barood (1998 film)

1998 Indian filmBaroodDirected byPramod ChakravortyWritten byRajeev KaulPraful ParekhJaved Siddiqui(dialogue)Produced byPramod ChakravortyLakshmi Chakravorty(associate producer)StarringAkshay KumarRaveena TandonAmrish PuriRakhi GulzarMohnish BehlEdited bySubhiraaj PalMusic byAnand–MilindRelease date 7 August 1998 (1998-08-07) Running time165 minutesCountryIndiaLanguageHindiBudget₹5.50 crore[1]Box office₹8.59 crore[1] Barood (transl. Gunpowder) is an...

 

 

Christelijke theosofie

Esoterie Westerse esoterie Esoterie in de klassieke oudheid Esoterische vakgebieden Alchemie Occultisme Magie Astrologie Waarzeggerij Geomantiek Handlijnkunde Numerologie Tarot Esoterische stromingen Antroposofie Christelijke theosofie Gnosis Golden Dawn Hermetisme Iatrosofie Illuminisme Mysticisme Neoplatonisme Neopythagorisme New age New thought Pythagorisme Rozenkruisers Theosofie Vrijmetselarij Esoterische teksten De alchemische bruiloft van Christiaan Rozenkruis De occulta philosophia l...

 

 

Siège de Boston

Siège de Boston Gravure représentant l'évacuation britannique de Boston. Informations générales Date 19 avril 1775 -17 mars 1776 Lieu Boston Issue Victoire américaine Belligérants  Treize colonies  Grande-Bretagne Commandants George Washington Thomas Gage Forces en présence 6 000 - 16 000 4 000 - 11 000 Pertes Environ 400 Environ 1 150 Guerre d'indépendance des États-UnisBatailles Campagne de Boston : Powder Alarm Suffolk Resolves Lexington et Concord Boston Thompson...

Cosmopolitan of Las Vegas

Casino hotel on the Las Vegas Strip The Cosmopolitan of Las VegasShow map of Las Vegas StripShow map of Nevada Location Paradise, Nevada, U.S. Address 3708 South Las Vegas BoulevardOpening dateDecember 15, 2010; 13 years ago (December 15, 2010)No. of rooms3,033Total gaming space100,000 sq ft (9,300 m2)Signature attractionsThe ChelseaThe ChandelierMarquee Nightclub & DayclubP3 art studioNotable restaurantsChina PoblanoéHolsteinsJaleoMomofukuScarpettaSTK Superfr...

 

 

Kontomire stew

Ghanaian stew Kontomire Stew with eggs and plantain Kontomire stew is a stew made from cocoyam leaves (known in the Akan language as kontomire), commonly prepared in the home and very popular in Ghanaian cuisine.[1] In Ghana, kontomire stew is served with variety of dishes,[2][3] including steamed rice, cooked yam and plantain.[4] Its English designation palava sauce is said to originate from the people of Elmina.[5][6] Ingredients Preparing kon...

 

 

The International Jew

Antisemitic set of publications of the 1920s The International Jew, The World's Problem — 1920 articles in the Dearborn Independent Part of a series onAntisemitism Part of Jewish history and discrimination History Timeline Reference Definitions IHRA definition of antisemitism Jerusalem Declaration on Antisemitism Nexus Document Three Ds Geography Argentina Australia Austria Belarus Belgium Canada Chinese Chilean Costa Rican Europe France Dreyfus affair 21st century 21st-century Germany Gree...

أولاد طوق غرب

أولاد طوق غرب  -  قرية مصرية -  تقسيم إداري البلد  مصر المحافظة محافظة سوهاج المركز دار السلام المسؤولون السكان التعداد السكاني 10051 نسمة (إحصاء 2006) معلومات أخرى التوقيت ت ع م+02:00  تعديل مصدري - تعديل   قرية أولاد طوق غرب هي إحدى القرى التابعة لمركز دار السلام ب...

 

 

Crinum bulbispermum

Species of flowering plants in the family Amaryllidaceae This article includes a list of general references, but it lacks sufficient corresponding inline citations. Please help to improve this article by introducing more precise citations. (March 2012) (Learn how and when to remove this message) Crinum bulbispermum Scientific classification Kingdom: Plantae Clade: Tracheophytes Clade: Angiosperms Clade: Monocots Order: Asparagales Family: Amaryllidaceae Subfamily: Amaryllidoideae Genus: Crinu...

 

 

Pilot (Psych)

1st episode of the 1st season of Psych PilotPsych episodeMalcolm Orso, after being shot by Mr. McCallum. Co-executive producer Chris Henze considered the murder to be the most gruesome scene in the show's history.Episode no.Season 1Episode 1Directed byMichael EnglerWritten bySteve FranksProduction code1001[1]Original air dateJuly 7, 2006 (2006-07-07)Running time66 minutes (broadcast version)[2]78 minutes (extended version)[3][4]Guest appeara...

Russian Empire census

First and only census carried out in the Russian Empire (1897) For other uses, see Russian census. This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: Russian Empire census – news · newspapers · books · scholar · JSTOR (December 2018) (Learn how and when to remove this message) First general census of the popula...

 

 

Gaston County Police Department

This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these messages) This article may rely excessively on sources too closely associated with the subject, potentially preventing the article from being verifiable and neutral. Please help improve it by replacing them with more appropriate citations to reliable, independent, third-party sources. (November 2011) (Learn how and when to remove this message) The topic of thi...