Binary and Multiple Stars, Part 4
40 entries in the Binary and Multiple Stars, Part 4 compendium.
28 CancriA faint Delta Scuti variable and likely astrometric binary.39 TauriA nearby G-type binary star in Taurus.40 Leonis MinorisA rapidly rotating A-type star with an unseen astrometric companion.54 EridaniA suspected astrometric binary and semiregular variable red giant.58 AquariiA triple system with an Am primary and a white dwarf tertiary.83 CancriAn astrometric binary with an unseen white dwarf companion.107 PisciumA K1V star with a disputed magnitude variation and unconfirmed binary status.111 HerculisA suspected astrometric binary in Hercules, visible to the naked eye.AZ PhoenicisA pulsating Delta Scuti variable and astrometric binary.Beta CraterisBinary star with a barium-enhanced primary and a low-mass white dwarf companion.Beta2 SagittariiA probable astrometric binary in Sagittarius, also known as Arkab Posterior.Chi CancriA candidate astrometric binary with an F-type main-sequence primary.Chi CarinaeA massive subgiant star in Carina, suspected astrometric binary.Delta AquilaeAn astrometric binary star system in the constellation Aquila.Epsilon AquilaeA binary star system with a disputed barium-star classification.Epsilon FornacisA high proper motion binary star in Fornax.Gaia BH1Nearest known black hole system as of 2026.Gaia BH2Third-closest known black hole system, discovered via Gaia astrometry.Gaia BH3Most massive known stellar black hole in the Milky Way.Gamma TucanaeA suspected astrometric binary in Tucana, possibly with a distant companion.HD 11007A probable astrometric binary in Triangulum, faintly visible to the naked eye.HD 16754Hierarchical triple star system with young solar-type companions.HD 32356An orange-hued K-type bright giant in Camelopardalis.HD 81799Suspected astrometric binary in Hydra, visible to the naked eye.HD 174881Binary of two K-type giants in Lyra, 396 pc away.HD 177365A B9 V visual binary in Telescopium with a 16th-magnitude companion.HD 181295A probable astrometric binary in Telescopium with an unseen companion.HD 187086Probable astrometric binary red giant in Telescopium.Iota CraterisTriple star system with a candidate technosignature signal.Iota SagittariiA K-type giant in Sagittarius with a faint red dwarf companion.Iota VirginisA nearby binary star with a traditional name and a distant companion.Kappa FornacisHierarchical triple with a G-type primary and a close M-dwarf binary.Kappa GeminorumBinary star system with a giant primary used as a spectral anchor.LHS 1678A nearby astrometric binary with three small exoplanets.NGC 1850 BH1A disputed binary system possibly containing a black hole or a stripped star.Omega SagittariiA binary star system in Sagittarius, formally named Terebellum.OMEGACat BH-2First black hole discovered in Omega Centauri globular cluster.Omicron AurigaeAn astrometric binary with a chemically peculiar A-type primary.Omicron PisciumA binary star in Pisces, visible to the naked eye.PhecdaAnchor star for classification, lower-left of the Big Dipper's bowl.
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