[{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","@id":"https:\/\/wiki.edu.vn\/en\/wiki43\/1-persei-wikipedia\/#BlogPosting","mainEntityOfPage":"https:\/\/wiki.edu.vn\/en\/wiki43\/1-persei-wikipedia\/","headline":"1 Persei – Wikipedia","name":"1 Persei – Wikipedia","description":"From Wikipedia, the free encyclopedia Star in the constellation Perseus 1 Persei Location of 1 Persei (circled) Observation dataEpoch J2000.0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Equinox","datePublished":"2014-07-12","dateModified":"2014-07-12","author":{"@type":"Person","@id":"https:\/\/wiki.edu.vn\/en\/wiki43\/author\/lordneo\/#Person","name":"lordneo","url":"https:\/\/wiki.edu.vn\/en\/wiki43\/author\/lordneo\/","image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"Enzyklop\u00e4die","logo":{"@type":"ImageObject","@id":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","url":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/e\/ef\/Perseus_constellation_map.svg\/260px-Perseus_constellation_map.svg.png","url":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/e\/ef\/Perseus_constellation_map.svg\/260px-Perseus_constellation_map.svg.png","height":"260","width":"260"},"url":"https:\/\/wiki.edu.vn\/en\/wiki43\/1-persei-wikipedia\/","wordCount":3281,"articleBody":"From Wikipedia, the free encyclopediaStar in the constellation Perseus1 PerseiLocation of 1 Persei (circled)Observation dataEpoch J2000.0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Equinox J2000.0ConstellationPerseusRight ascension01h 51m 59.32008s[1]Declination+55\u00b0\u00a008\u2032\u00a050.5837\u2033[1]Apparent\u00a0magnitude\u00a0(V)5.49 – 5.74 – 5.85[2]CharacteristicsSpectral\u00a0typeB1.5V[2]Variable\u00a0typeeclipsing binary[3]AstrometryProper motion (\u03bc) RA:\u00a012.716(74)[1]\u00a0mas\/yr Dec.:\u00a0\u22128.410(79)[1]\u00a0mas\/yr Parallax (\u03c0)2.6944\u00a0\u00b1\u00a00.0888\u00a0mas[1]Distance1,210 \u00b1 40\u00a0ly (370 \u00b1 10\u00a0pc)Absolute\u00a0magnitude\u00a0(MV)\u22121.37\/\u22121.77[4]Orbit[4]Primary1 Persei ACompanion1 Persei BPeriod (P)25.935951\u00b10.000003\u00a0dEccentricity (e)0.3768\u00b10.0014Inclination (i)88.048\u00b10.002\u00b0Periastron epoch (T)2443563.466\u00b10.005\u00a0HJDArgument of periastron (\u03c9)(secondary)109.83\u00b10.10\u00b0Semi-amplitude (K1)(primary)97.4\u00b10.1 km\/sSemi-amplitude (K2)(secondary)91.2\u00b10.1 km\/sDetails[4]PrimaryMass6.95\u00a0M\u2609Radius3.29\u00a0R\u2609Luminosity2,188\u00a0L\u2609Surface gravity (log\u00a0g)4.25\u00a0cgsTemperature21,500\u00a0KRotation1.45 daysRotational velocity (v\u00a0sin\u00a0i)115\u00a0km\/sSecondaryMass7.42\u00a0M\u2609Radius3.86\u00a0R\u2609Luminosity3,311\u00a0L\u2609Surface gravity (log\u00a0g)4.14\u00a0cgsTemperature22,000\u00a0KRotation1.40 daysRotational velocity (v\u00a0sin\u00a0i)140\u00a0km\/sOther designationsDatabase referencesSIMBADdata1 Persei (1 Per) is an eclipsing binary[3]star in the constellation Perseus. Its uneclipsed apparent magnitude is 5.49. The binary star consists of two B2 type main-sequence stars in a 25.9 day eccentric orbit.[5] The stars are surrounded by a faint cloud of gas visible in mid-infrared, although whether they are the origin of the gas or simply passing through it is unclear.Observational history[edit]  The possible eclipsing binary nature of 1 Persei was first noticed by Donald Kurtz in 1977 when it was used as a comparison star to test for photometric variability of HD 11408.[6] In 1979 French amateur observers succeeded in determining an orbital period of 25.9 days.[7]  During the primary eclipse, the brightness drops to magnitude 5.85.  In the secondary eclipses, the brightness drops to magnitude 5.74.  The eclipses each last for approximately 25 hours.[2]References[edit]^ a b c d e Brown, A. G. A.;  et\u00a0al. (Gaia collaboration) (2021). “Gaia Early Data Release 3: Summary of the contents and survey properties”. Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A…649A…1G. doi:10.1051\/0004-6361\/202039657. S2CID\u00a0227254300. (Erratum:\u00a0doi:10.1051\/0004-6361\/202039657e).  Gaia EDR3 record for this source at VizieR.^ a b c Samus, N. N.; Durlevich, O. V.;  et\u00a0al. (2009). “VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)”. VizieR On-line Data Catalog: B\/GCVS. Originally Published in: 2009yCat….102025S. 1. Bibcode:2009yCat….102025S.^ a b North, P.;  et\u00a0al. (1981). “1 Per: a new eclipsing binary with a long period and an elliptical orbit” (PDF). Information Bulletin on Variable Stars. 2036: 1. Bibcode:1981IBVS.2036….1N.^ a b c d Jan\u00edk, J.;  et\u00a0al. (2003). “Search for forced oscillations in binaries. IV. The eclipsing binary V436 Per revisited”. Astronomy and Astrophysics. 408 (2): 611\u2013619. Bibcode:2003A&A…408..611J. doi:10.1051\/0004-6361:20030960.^ Harmanec, P.;  et\u00a0al. (1997). “Search for forced oscillations in binaries. I. The eclipsing and spectroscopic binary V436 Persei = 1 Persei”. Astronomy and Astrophysics. 319 (2): 867\u2013880. Bibcode:1997A&A…319..867H.^ Kurtz, D. W. (1977). “The photometric variability of 1 Per”. Publications of the Astronomical Society of the Pacific. 89: 939\u2013940. Bibcode:1977PASP…89..939K. doi:10.1086\/130251.^ Figer, Alain; Maurin, Luc (1979). “1 Persei, a low amplitude eclipsing binary, has a period of 25.939 days and an elliptical orbit”. GEOS Circular on Eclipsing Binaries. 2 (EB 2). Bibcode:1979GEOCE…2…..F."},{"@context":"http:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"https:\/\/wiki.edu.vn\/en\/wiki43\/#breadcrumbitem","name":"Enzyklop\u00e4die"}},{"@type":"ListItem","position":2,"item":{"@id":"https:\/\/wiki.edu.vn\/en\/wiki43\/1-persei-wikipedia\/#breadcrumbitem","name":"1 Persei – Wikipedia"}}]}]