[{"n": "Binary star", "u": "/e/binary-and-multiple-stars/binary-star/", "s": "Two stars gravitationally bound, orbiting a common center of mass."}, {"n": "Semidetached binary", "u": "/e/binary-and-multiple-stars/semidetached-binary/", "s": "A binary where one star transfers mass to its companion."}, {"n": "Eclipsing binary", "u": "/e/binary-and-multiple-stars/eclipsing-binary/", "s": "Binary stars that eclipse each other as they orbit."}, {"n": "Astrometric binary", "u": "/e/binary-and-multiple-stars/astrometric-binary/", "s": "Some stars appear to circle an invisible point."}, {"n": "Accretion disk", "u": "/e/binary-and-multiple-stars/accretion-disk/", "s": "Accretion disks are ubiquitous structures that drive mass onto central objects."}, {"n": "Binary mass function", "u": "/e/binary-and-multiple-stars/binary-mass-function/", "s": "A function constraining the mass of an unseen binary component."}, {"n": "Brown-dwarf desert", "u": "/e/binary-and-multiple-stars/brown-dwarf-desert/", "s": "A theorized orbital zone where brown dwarf companions are rarely found."}, {"n": "Chirp mass", "u": "/e/binary-and-multiple-stars/chirp-mass/", "s": "Chirp mass governs gravitational wave frequency evolution during inspiral."}, {"n": "Common envelope", "u": "/e/binary-and-multiple-stars/common-envelope/", "s": "A short-lived phase where a binary system is engulfed in shared gas."}, {"n": "Dynamical parallax", "u": "/e/binary-and-multiple-stars/dynamical-parallax/", "s": "Distance to visual binaries via orbital and brightness data."}, {"n": "O'Connell effect", "u": "/e/binary-and-multiple-stars/o-connell-effect/", "s": "Asymmetry in light curves of close eclipsing binary stars."}, {"n": "Roche lobe", "u": "/e/binary-and-multiple-stars/roche-lobe/", "s": "Boundary defining gravitational capture in binary star systems."}, {"n": "Rp-process", "u": "/e/binary-and-multiple-stars/rp-process/", "s": "Rapid proton capture nucleosynthesis on the proton-rich side of stability."}, {"n": "Struve–Sahade effect", "u": "/e/binary-and-multiple-stars/struve-sahade-effect/", "s": "Anomalous spectral line strength variation in binary stars."}, {"n": "Algol variable", "u": "/e/binary-and-multiple-stars/algol-variable/", "s": "Eclipsing binary stars with well-defined, near-spherical components."}, {"n": "AM Canum Venaticorum star", "u": "/e/binary-and-multiple-stars/am-canum-venaticorum-star/", "s": "Rare hydrogen-poor cataclysmic variables with ultra-short orbital periods."}, {"n": "Binary black hole", "u": "/e/binary-and-multiple-stars/binary-black-hole/", "s": "Two black holes in close orbit, confirmed by gravitational waves."}, {"n": "Circumbinary planet", "u": "/e/binary-and-multiple-stars/circumbinary-planet/", "s": "A planet orbiting two stars, not just one."}, {"n": "Colliding-wind binary", "u": "/e/binary-and-multiple-stars/colliding-wind-binary/", "s": "Binary system where massive stellar winds collide, producing shocks and dust."}, {"n": "Contact binary", "u": "/e/binary-and-multiple-stars/contact-binary/", "s": "Binary stars that touch or share gaseous envelopes."}, {"n": "Interacting binary star", "u": "/e/binary-and-multiple-stars/interacting-binary-star/", "s": "Binary stars where one star transfers mass to the other."}, {"n": "RS Canum Venaticorum variable", "u": "/e/binary-and-multiple-stars/rs-canum-venaticorum-variable/", "s": "Close binary stars with starspots causing brightness variations."}, {"n": "19 Puppis", "u": "/e/binary-and-multiple-stars/19-puppis/", "s": "Binary system with a red clump giant primary in Puppis."}, {"n": "20 Leonis Minoris", "u": "/e/binary-and-multiple-stars/20-leonis-minoris/", "s": "Binary star with a confirmed hot Neptune exoplanet."}, {"n": "23 Ursae Majoris", "u": "/e/binary-and-multiple-stars/23-ursae-majoris/", "s": "A yellow-white binary star in Ursa Major."}, {"n": "27 Canis Majoris", "u": "/e/binary-and-multiple-stars/27-canis-majoris/", "s": "Binary system with a Be star and Gamma Cassiopeiae variable."}, {"n": "27 Piscium", "u": "/e/binary-and-multiple-stars/27-piscium/", "s": "Binary star with a possible brown dwarf companion."}, {"n": "28 Cygni", "u": "/e/binary-and-multiple-stars/28-cygni/", "s": "A Be binary with a rapidly spinning primary and a subdwarf O companion."}, {"n": "31 Leonis", "u": "/e/binary-and-multiple-stars/31-leonis/", "s": "Binary star in Leo with a red giant primary."}, {"n": "33 Boötis", "u": "/e/binary-and-multiple-stars/33-bo-tis/", "s": "An A-type star with a brown dwarf companion in a highly eccentric orbit."}, {"n": "36 Andromedae", "u": "/e/binary-and-multiple-stars/36-andromedae/", "s": "Binary star in Andromeda, part of a triple system."}, {"n": "36 Serpentis", "u": "/e/binary-and-multiple-stars/36-serpentis/", "s": "Triple star system with two spectroscopic binaries and rapid rotation."}, {"n": "39 Leonis", "u": "/e/binary-and-multiple-stars/39-leonis/", "s": "F6 V star with a debris disk and an M1 red dwarf companion."}, {"n": "40 Cancri", "u": "/e/binary-and-multiple-stars/40-cancri/", "s": "A blue straggler binary in the Beehive Cluster."}, {"n": "41 Lyncis", "u": "/e/binary-and-multiple-stars/41-lyncis/", "s": "A giant star with a disputed planet, named Intercrus."}, {"n": "53 Aquarii", "u": "/e/binary-and-multiple-stars/53-aquarii/", "s": "A wide binary in Aquarius, candidate member of the Castor Moving Group."}, {"n": "53 Eridani", "u": "/e/binary-and-multiple-stars/53-eridani/", "s": "Binary star in Eridanus with a named primary component."}, {"n": "54 Aurigae", "u": "/e/binary-and-multiple-stars/54-aurigae/", "s": "A multiple star system with an eclipsing binary and a disputed companion."}, {"n": "54 Leonis", "u": "/e/binary-and-multiple-stars/54-leonis/", "s": "Binary of two rapidly rotating A-type stars 321 light years away."}, {"n": "55 Cancri", "u": "/e/binary-and-multiple-stars/55-cancri/", "s": "Binary star system with five planets around its primary star."}, {"n": "56 Andromedae", "u": "/e/binary-and-multiple-stars/56-andromedae/", "s": "A probable binary with a red clump giant primary."}, {"n": "66 Ophiuchi", "u": "/e/binary-and-multiple-stars/66-ophiuchi/", "s": "A Be star binary with a variable disk and a faint companion."}, {"n": "67 Cancri", "u": "/e/binary-and-multiple-stars/67-cancri/", "s": "A wide binary with a rapidly rotating A-type primary."}, {"n": "70 Ophiuchi", "u": "/e/binary-and-multiple-stars/70-ophiuchi/", "s": "Binary star with a history of disputed planetary claims."}, {"n": "72 Ophiuchi", "u": "/e/binary-and-multiple-stars/72-ophiuchi/", "s": "Binary star in Ophiuchus, once the brightest star of Taurus Poniatovii."}, {"n": "73 Leonis", "u": "/e/binary-and-multiple-stars/73-leonis/", "s": "A binary star system with a K2 III giant primary."}, {"n": "75 Ceti", "u": "/e/binary-and-multiple-stars/75-ceti/", "s": "A red clump giant with two confirmed planets."}, {"n": "78 Ursae Majoris", "u": "/e/binary-and-multiple-stars/78-ursae-majoris/", "s": "Binary star system in Ursa Major with a 105-year orbit."}, {"n": "83 Leonis", "u": "/e/binary-and-multiple-stars/83-leonis/", "s": "Binary system with an exoplanet orbiting the secondary star."}, {"n": "84 Ceti", "u": "/e/binary-and-multiple-stars/84-ceti/", "s": "Binary star system in Cetus, candidate member of Tucana-Horologium Association."}, {"n": "88 Leonis", "u": "/e/binary-and-multiple-stars/88-leonis/", "s": "A wide binary near naked-eye visibility with a cycling primary star."}, {"n": "95 Herculis", "u": "/e/binary-and-multiple-stars/95-herculis/", "s": "A double star with a blue-white primary and yellow secondary."}, {"n": "99 Herculis", "u": "/e/binary-and-multiple-stars/99-herculis/", "s": "Binary star with a polar-aligned debris disk possibly shaped by two planets."}, {"n": "AFGL 4106", "u": "/e/binary-and-multiple-stars/afgl-4106/", "s": "Binary system with two supergiants in different evolutionary stages."}, {"n": "AK Scorpii", "u": "/e/binary-and-multiple-stars/ak-scorpii/", "s": "Young binary star with variable accretion and a circumbinary disk."}, {"n": "Albireo", "u": "/e/binary-and-multiple-stars/albireo/", "s": "A striking double star in Cygnus, famous for its color contrast."}, {"n": "Aldebaran", "u": "/e/binary-and-multiple-stars/aldebaran/", "s": "Brightest star in Taurus, a red giant with a faint binary companion."}, {"n": "Alpha Caeli", "u": "/e/binary-and-multiple-stars/alpha-caeli/", "s": "Brightest star in Caelum, a binary with a debris disk."}, {"n": "Alpha Cancri", "u": "/e/binary-and-multiple-stars/alpha-cancri/", "s": "Alpha Cancri is a white A-type star with a faint companion."}, {"n": "Alpha Circini", "u": "/e/binary-and-multiple-stars/alpha-circini/", "s": "Brightest star in Circinus, a rapidly oscillating Ap variable."}, {"n": "Alpha Comae Berenices", "u": "/e/binary-and-multiple-stars/alpha-comae-berenices/", "s": "A binary star system in Coma Berenices, faintly visible to the naked eye."}, {"n": "Alpha Delphini", "u": "/e/binary-and-multiple-stars/alpha-delphini/", "s": "Multiple star system with the historical name Sualocin."}, {"n": "Alpha Mensae", "u": "/e/binary-and-multiple-stars/alpha-mensae/", "s": "The dimmest lucida in the sky, a G-type star with a red dwarf companion."}, {"n": "Alpha Ophiuchi", "u": "/e/binary-and-multiple-stars/alpha-ophiuchi/", "s": "Binary star and brightest in Ophiuchus, rapidly rotating and oblate."}, {"n": "Alpha Reticuli", "u": "/e/binary-and-multiple-stars/alpha-reticuli/", "s": "Brightest star in Reticulum, possibly a binary with a 60,000-year orbit."}, {"n": "Antares", "u": "/e/binary-and-multiple-stars/antares/", "s": "Red supergiant binary star, heart of Scorpius."}, {"n": "Apep (star system)", "u": "/e/binary-and-multiple-stars/apep-star-system/", "s": "Triple star system and top gamma-ray burst progenitor in the Milky Way."}, {"n": "AR Scorpii", "u": "/e/binary-and-multiple-stars/ar-scorpii/", "s": "First white dwarf-pulsar binary discovered."}, {"n": "ASASSN-V J173229.06−613712.5", "u": "/e/binary-and-multiple-stars/asassn-v-j173229-06-613712-5/", "s": "Young contact binary in Mamajek 4 tidal tail."}, {"n": "Atlas (star)", "u": "/e/binary-and-multiple-stars/atlas-star/", "s": "Binary star in the Pleiades, named after the Titan Atlas."}, {"n": "BD+05 4868", "u": "/e/binary-and-multiple-stars/bd-05-4868/", "s": "Binary star with a disintegrating rocky planet creating a comet-like tail."}, {"n": "BD+29 5007", "u": "/e/binary-and-multiple-stars/bd-29-5007/", "s": "K5V star with a disputed Argus association companion."}, {"n": "BD−07 436", "u": "/e/binary-and-multiple-stars/bd-07-436/", "s": "Binary star with a hot Jupiter and conflicting stellar ages."}, {"n": "Beta Cancri", "u": "/e/binary-and-multiple-stars/beta-cancri/", "s": "Brightest star in Cancer, an orange giant with a barium-rich spectrum."}, {"n": "Beta Coronae Borealis", "u": "/e/binary-and-multiple-stars/beta-coronae-borealis/", "s": "Binary star with disputed orbit and a rapidly oscillating Ap component."}, {"n": "Beta Delphini", "u": "/e/binary-and-multiple-stars/beta-delphini/", "s": "Brightest star in Delphinus, a binary with a 26.66-year orbit."}, {"n": "Beta Draconis", "u": "/e/binary-and-multiple-stars/beta-draconis/", "s": "Binary star system and third-brightest star in Draco."}, {"n": "Beta Herculis", "u": "/e/binary-and-multiple-stars/beta-herculis/", "s": "Binary star and brightest star in Hercules."}, {"n": "Beta Leonis Minoris", "u": "/e/binary-and-multiple-stars/beta-leonis-minoris/", "s": "Binary star in Leo Minor, second brightest in its constellation."}, {"n": "Altair", "u": "/e/binary-and-multiple-stars/altair/", "s": "Altair is a rapidly rotating, oblate A-type star in Aquila."}, {"n": "Beta Monocerotis", "u": "/e/binary-and-multiple-stars/beta-monocerotis/", "s": "Triple Be star system discovered by William Herschel in 1781."}, {"n": "Iota Herculis", "u": "/e/binary-and-multiple-stars/iota-herculis/", "s": "A binary star and former pole star in Hercules."}, {"n": "Psi Cassiopeiae", "u": "/e/binary-and-multiple-stars/psi-cassiopeiae/", "s": "An orange-hued evolved giant binary in Cassiopeia."}, {"n": "4 Camelopardalis", "u": "/e/binary-and-multiple-stars/4-camelopardalis/", "s": "A probable multiple star in Camelopardalis with an Am primary."}, {"n": "Beta Leporis", "u": "/e/binary-and-multiple-stars/beta-leporis/", "s": "Second brightest star in Lepus, a G-type bright giant."}, {"n": "Gamma Andromedae", "u": "/e/binary-and-multiple-stars/gamma-andromedae/", "s": "A quadruple star system with a golden-blue visual contrast."}, {"n": "W Sagittarii", "u": "/e/binary-and-multiple-stars/w-sagittarii/", "s": "A Cepheid variable and multiple star in Sagittarius."}, {"n": "Zeta Andromedae", "u": "/e/binary-and-multiple-stars/zeta-andromedae/", "s": "A binary star system with resolved starspots and magnetic field studies."}, {"n": "Xi Scorpii", "u": "/e/binary-and-multiple-stars/xi-scorpii/", "s": "Quintuple star system in Scorpius with two close groups."}, {"n": "6 Cassiopeiae", "u": "/e/binary-and-multiple-stars/6-cassiopeiae/", "s": "White hypergiant with disputed classification and a close O-class companion."}, {"n": "Gamma Cassiopeiae", "u": "/e/binary-and-multiple-stars/gamma-cassiopeiae/", "s": "First star observed with emission lines; prototype of Gamma Cassiopeiae variables."}, {"n": "Epsilon Chamaeleontis", "u": "/e/binary-and-multiple-stars/epsilon-chamaeleontis/", "s": "Triple star system in Chamaeleon, member of Scorpius-Centaurus Association."}, {"n": "Epsilon Cygni", "u": "/e/binary-and-multiple-stars/epsilon-cygni/", "s": "Third-brightest star in Cygnus, a binary with a named primary."}, {"n": "HD 895", "u": "/e/binary-and-multiple-stars/hd-895/", "s": "A multiple star system with two spectroscopic binary pairs."}, {"n": "HD 4222", "u": "/e/binary-and-multiple-stars/hd-4222/", "s": "White-hued A-type primary of binary BU 492 in Cassiopeia."}, {"n": "HD 176664", "u": "/e/binary-and-multiple-stars/hd-176664/", "s": "An orange giant approaching the Solar System at −60 km/s."}, {"n": "Lambda Ophiuchi", "u": "/e/binary-and-multiple-stars/lambda-ophiuchi/", "s": "Quadruple star system in Ophiuchus with hierarchical orbits."}, {"n": "54 Piscium A", "u": "/e/binary-and-multiple-stars/54-piscium/", "s": "Orange dwarf with a planet and a brown dwarf companion."}, {"n": "54 Piscium Ab", "u": "/e/binary-and-multiple-stars/54-piscium-ab/", "s": "A Saturn-mass exoplanet with a highly eccentric orbit."}, {"n": "6 Andromedae", "u": "/e/binary-and-multiple-stars/6-andromedae/", "s": "A binary system with a dusty disk and a hidden secondary."}, {"n": "12 Hydrae", "u": "/e/binary-and-multiple-stars/12-hydrae/", "s": "A probable astrometric binary with a spectroscopic binary primary."}, {"n": "16 Lyrae", "u": "/e/binary-and-multiple-stars/16-lyrae/", "s": "Suspected astrometric binary with disputed subgiant status."}, {"n": "28 Cancri", "u": "/e/binary-and-multiple-stars/28-cancri/", "s": "A faint Delta Scuti variable and likely astrometric binary."}, {"n": "39 Tauri", "u": "/e/binary-and-multiple-stars/39-tauri/", "s": "A nearby G-type binary star in Taurus."}, {"n": "40 Leonis Minoris", "u": "/e/binary-and-multiple-stars/40-leonis-minoris/", "s": "A rapidly rotating A-type star with an unseen astrometric companion."}, {"n": "54 Eridani", "u": "/e/binary-and-multiple-stars/54-eridani/", "s": "A suspected astrometric binary and semiregular variable red giant."}, {"n": "58 Aquarii", "u": "/e/binary-and-multiple-stars/58-aquarii/", "s": "A triple system with an Am primary and a white dwarf tertiary."}, {"n": "83 Cancri", "u": "/e/binary-and-multiple-stars/83-cancri/", "s": "An astrometric binary with an unseen white dwarf companion."}, {"n": "107 Piscium", "u": "/e/binary-and-multiple-stars/107-piscium/", "s": "A K1V star with a disputed magnitude variation and unconfirmed binary status."}, {"n": "111 Herculis", "u": "/e/binary-and-multiple-stars/111-herculis/", "s": "A suspected astrometric binary in Hercules, visible to the naked eye."}, {"n": "AZ Phoenicis", "u": "/e/binary-and-multiple-stars/az-phoenicis/", "s": "A pulsating Delta Scuti variable and astrometric binary."}, {"n": "Beta Crateris", "u": "/e/binary-and-multiple-stars/beta-crateris/", "s": "Binary star with a barium-enhanced primary and a low-mass white dwarf companion."}, {"n": "Beta2 Sagittarii", "u": "/e/binary-and-multiple-stars/beta2-sagittarii/", "s": "A probable astrometric binary in Sagittarius, also known as Arkab Posterior."}, {"n": "Chi Cancri", "u": "/e/binary-and-multiple-stars/chi-cancri/", "s": "A candidate astrometric binary with an F-type main-sequence primary."}, {"n": "Chi Carinae", "u": "/e/binary-and-multiple-stars/chi-carinae/", "s": "A massive subgiant star in Carina, suspected astrometric binary."}, {"n": "Delta Aquilae", "u": "/e/binary-and-multiple-stars/delta-aquilae/", "s": "An astrometric binary star system in the constellation Aquila."}, {"n": "Epsilon Aquilae", "u": "/e/binary-and-multiple-stars/epsilon-aquilae/", "s": "A binary star system with a disputed barium-star classification."}, {"n": "Epsilon Fornacis", "u": "/e/binary-and-multiple-stars/epsilon-fornacis/", "s": "A high proper motion binary star in Fornax."}, {"n": "Gaia BH1", "u": "/e/binary-and-multiple-stars/gaia-bh1/", "s": "Nearest known black hole system as of 2026."}, {"n": "Gaia BH2", "u": "/e/binary-and-multiple-stars/gaia-bh2/", "s": "Third-closest known black hole system, discovered via Gaia astrometry."}, {"n": "Gaia BH3", "u": "/e/binary-and-multiple-stars/gaia-bh3/", "s": "Most massive known stellar black hole in the Milky Way."}, {"n": "Gamma Tucanae", "u": "/e/binary-and-multiple-stars/gamma-tucanae/", "s": "A suspected astrometric binary in Tucana, possibly with a distant companion."}, {"n": "HD 11007", "u": "/e/binary-and-multiple-stars/hd-11007/", "s": "A probable astrometric binary in Triangulum, faintly visible to the naked eye."}, {"n": "HD 16754", "u": "/e/binary-and-multiple-stars/hd-16754/", "s": "Hierarchical triple star system with young solar-type companions."}, {"n": "HD 32356", "u": "/e/binary-and-multiple-stars/hd-32356/", "s": "An orange-hued K-type bright giant in Camelopardalis."}, {"n": "HD 81799", "u": "/e/binary-and-multiple-stars/hd-81799/", "s": "Suspected astrometric binary in Hydra, visible to the naked eye."}, {"n": "HD 174881", "u": "/e/binary-and-multiple-stars/hd-174881/", "s": "Binary of two K-type giants in Lyra, 396 pc away."}, {"n": "HD 177365", "u": "/e/binary-and-multiple-stars/hd-177365/", "s": "A B9 V visual binary in Telescopium with a 16th-magnitude companion."}, {"n": "HD 181295", "u": "/e/binary-and-multiple-stars/hd-181295/", "s": "A probable astrometric binary in Telescopium with an unseen companion."}, {"n": "HD 187086", "u": "/e/binary-and-multiple-stars/hd-187086/", "s": "Probable astrometric binary red giant in Telescopium."}, {"n": "Iota Crateris", "u": "/e/binary-and-multiple-stars/iota-crateris/", "s": "Triple star system with a candidate technosignature signal."}, {"n": "Iota Sagittarii", "u": "/e/binary-and-multiple-stars/iota-sagittarii/", "s": "A K-type giant in Sagittarius with a faint red dwarf companion."}, {"n": "Iota Virginis", "u": "/e/binary-and-multiple-stars/iota-virginis/", "s": "A nearby binary star with a traditional name and a distant companion."}, {"n": "Kappa Fornacis", "u": "/e/binary-and-multiple-stars/kappa-fornacis/", "s": "Hierarchical triple with a G-type primary and a close M-dwarf binary."}, {"n": "Kappa Geminorum", "u": "/e/binary-and-multiple-stars/kappa-geminorum/", "s": "Binary star system with a giant primary used as a spectral anchor."}, {"n": "LHS 1678", "u": "/e/binary-and-multiple-stars/lhs-1678/", "s": "A nearby astrometric binary with three small exoplanets."}, {"n": "NGC 1850 BH1", "u": "/e/binary-and-multiple-stars/ngc-1850-bh1/", "s": "A disputed binary system possibly containing a black hole or a stripped star."}, {"n": "Omega Sagittarii", "u": "/e/binary-and-multiple-stars/omega-sagittarii/", "s": "A binary star system in Sagittarius, formally named Terebellum."}, {"n": "OMEGACat BH-2", "u": "/e/binary-and-multiple-stars/omegacat-bh-2/", "s": "First black hole discovered in Omega Centauri globular cluster."}, {"n": "Omicron Aurigae", "u": "/e/binary-and-multiple-stars/omicron-aurigae/", "s": "An astrometric binary with a chemically peculiar A-type primary."}, {"n": "Omicron Piscium", "u": "/e/binary-and-multiple-stars/omicron-piscium/", "s": "A binary star in Pisces, visible to the naked eye."}, {"n": "Phecda", "u": "/e/binary-and-multiple-stars/phecda/", "s": "Anchor star for classification, lower-left of the Big Dipper's bowl."}, {"n": "Pi Sculptoris", "u": "/e/binary-and-multiple-stars/pi-sculptoris/", "s": "An aging giant star in Sculptor, possibly part of a binary system."}, {"n": "Psi Scorpii", "u": "/e/binary-and-multiple-stars/psi-scorpii/", "s": "A white binary star in Scorpius with a directly detected companion."}, {"n": "Rho Pegasi", "u": "/e/binary-and-multiple-stars/rho-pegasi/", "s": "A probable astrometric binary with a white A-type primary."}, {"n": "Rho3 Arietis", "u": "/e/binary-and-multiple-stars/rho3-arietis/", "s": "An astrometric binary in Aries, faintly visible to the naked eye."}, {"n": "Sigma Aquarii", "u": "/e/binary-and-multiple-stars/sigma-aquarii/", "s": "A white subgiant star in Aquarius, possibly an astrometric binary."}, {"n": "Sigma Ceti", "u": "/e/binary-and-multiple-stars/sigma-ceti/", "s": "A hierarchical triple star system in Cetus."}, {"n": "Tau Coronae Borealis", "u": "/e/binary-and-multiple-stars/tau-coronae-borealis/", "s": "A possible binary star in Corona Borealis."}, {"n": "Theta Apodis", "u": "/e/binary-and-multiple-stars/theta-apodis/", "s": "A high-proper-motion red giant with a variable brightness and a binary companion."}, {"n": "Theta Circini", "u": "/e/binary-and-multiple-stars/theta-circini/", "s": "A binary Be star system in Circinus with Gamma Cassiopeiae variability."}, {"n": "Upsilon Serpentis", "u": "/e/binary-and-multiple-stars/upsilon-serpentis/", "s": "A-type main-sequence star in Serpens, suspected astrometric binary."}, {"n": "Upsilon1 Cassiopeiae", "u": "/e/binary-and-multiple-stars/upsilon1-cassiopeiae/", "s": "A naked-eye astrometric binary in Cassiopeia, 330 light years away."}, {"n": "Xi Tauri", "u": "/e/binary-and-multiple-stars/xi-tauri/", "s": "A hierarchical quadruple system with eclipsing and spectroscopic components."}, {"n": "Xi2 Canis Majoris", "u": "/e/binary-and-multiple-stars/xi2-canis-majoris/", "s": "A white-hued binary star system in Canis Major."}, {"n": "Xi2 Sagittarii", "u": "/e/binary-and-multiple-stars/xi2-sagittarii/", "s": "A naked-eye astrometric binary in Sagittarius, also known as Jian."}, {"n": "2MASS J11011926−7732383", "u": "/e/binary-and-multiple-stars/2mass-j11011926-7732383/", "s": "First brown dwarf binary found with separation over 20 au."}, {"n": "2M1510", "u": "/e/binary-and-multiple-stars/2m1510/", "s": "A triple brown dwarf system with an eclipsing binary and a planet candidate."}, {"n": "2MASS J05352184−0546085", "u": "/e/binary-and-multiple-stars/2mass-j05352184-0546085/", "s": "First eclipsing binary brown dwarf system discovered."}, {"n": "2MASSW J0920122+351742", "u": "/e/binary-and-multiple-stars/2massw-j0920122-351742/", "s": "Triple brown dwarf system with a highly inclined orbit."}, {"n": "81 Cancri", "u": "/e/binary-and-multiple-stars/81-cancri/", "s": "A multiple system with a close binary and a brown dwarf binary."}, {"n": "CFBDSIR J145829+101343", "u": "/e/binary-and-multiple-stars/cfbdsir-j145829-101343/", "s": "Binary brown dwarf system with a Y0 companion among the coolest known."}, {"n": "CWISEP J1935−1546", "u": "/e/binary-and-multiple-stars/cwisep-j1935-1546/", "s": "Cold Y-dwarf binary with auroral methane emission."}, {"n": "Epsilon Indi", "u": "/e/binary-and-multiple-stars/epsilon-indi/", "s": "A nearby K-dwarf system with brown dwarfs and a Jovian planet."}, {"n": "HD 130948", "u": "/e/binary-and-multiple-stars/hd-130948/", "s": "A Sun-like star with two co-orbiting brown dwarfs."}, {"n": "Kelu-1", "u": "/e/binary-and-multiple-stars/kelu-1/", "s": "A binary brown dwarf system and prototype L dwarf."}, {"n": "LP 261-75", "u": "/e/binary-and-multiple-stars/lp-261-75/", "s": "Triple system with a red dwarf and two brown dwarfs."}, {"n": "Luhman 16", "u": "/e/binary-and-multiple-stars/luhman-16/", "s": "Closest-known brown dwarf binary, third-nearest system to the Sun."}, {"n": "Nu Ophiuchi", "u": "/e/binary-and-multiple-stars/nu-ophiuchi/", "s": "A K-type giant with two brown dwarfs in resonance."}, {"n": "Oph 162225-240515", "u": "/e/binary-and-multiple-stars/oph-162225-240515/", "s": "Wide brown dwarf binary in Scorpius, first of its kind reported."}, {"n": "SDSS J141624.08+134826.7", "u": "/e/binary-and-multiple-stars/sdss-j141624-08-134826-7/", "s": "A nearby wide binary of two brown dwarfs in Boötes."}, {"n": "UScoCTIO 108", "u": "/e/binary-and-multiple-stars/uscoctio-108/", "s": "A wide binary of two brown dwarfs in Upper Scorpius."}, {"n": "VHS J1256−1257", "u": "/e/binary-and-multiple-stars/vhs-j1256-1257/", "s": "A triple brown dwarf system with a highly variable planetary-mass companion."}, {"n": "WISE 0146+4234", "u": "/e/binary-and-multiple-stars/wise-0146-4234/", "s": "Binary brown dwarf at the T/Y transition in Andromeda."}, {"n": "WISE 0458+6434", "u": "/e/binary-and-multiple-stars/wise-0458-6434/", "s": "Binary ultracool brown dwarfs, first WISE-discovered brown dwarf."}, {"n": "WISE 0535−7500", "u": "/e/binary-and-multiple-stars/wise-0535-7500/", "s": "Possible binary Y1 brown dwarf system in Mensa."}, {"n": "WISE 1217+1626", "u": "/e/binary-and-multiple-stars/wise-1217-1626/", "s": "Binary brown dwarf system of spectral types T9 and Y0."}, {"n": "WISE 2150−7520", "u": "/e/binary-and-multiple-stars/wise-2150-7520/", "s": "A wide binary brown dwarf system in Octans."}, {"n": "WISE J0336−0143", "u": "/e/binary-and-multiple-stars/wise-j0336-0143/", "s": "Binary Y-type brown dwarfs with masses near the deuterium fusion threshold."}, {"n": "WISEPA J101905.63+652954.2", "u": "/e/binary-and-multiple-stars/wisepa-j101905-63-652954-2/", "s": "Binary cold brown dwarfs with pulsed radio auroral emission."}, {"n": "WISEPA J184124.74+700038.0", "u": "/e/binary-and-multiple-stars/wisepa-j184124-74-700038-0/", "s": "One of the first known binary brown dwarf systems."}, {"n": "ZTF J1239+8347", "u": "/e/binary-and-multiple-stars/ztf-j1239-8347/", "s": "First mass-transferring binary brown dwarf system discovered."}, {"n": "Low-mass X-ray binary", "u": "/e/binary-and-multiple-stars/low-mass-x-ray-binary/", "s": "Binary systems where a compact object accretes from a low-mass star."}, {"n": "BV Centauri", "u": "/e/binary-and-multiple-stars/bv-centauri/", "s": "A dwarf nova with an unusually long period and anomalous outbursts."}]