A.L. Double Star Observing List Page 1 of 7

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1 Page 1 of 7 Eta Cassiopeia η Cassiopeiae 00h 49.1m ' Cassiopeia 1 3.4, : 12.0" 2000: 12.9" 2020: 13.5" 65 Pisces 00h 49.9m ' Pisces 4 6.3, " 297 Psi 1 Pisces ϕ 1 Piscium Zeta Pisces ζ Piscium Gamma Aries γ Arietis Lambda Aries λ Arietis Alpha Pisces α Piscium Gamma Andromeda γ Andromedae Iota Triangulum ι Trianguli Alpha Ursa Minor α Ursae Minoris (Polaris) Gamma Cetus γ Ceti Eta Perseus η Persei Struve 331 Σ331 01h 05.6m ' Pisces 4 5.6, " h 13.7m ' Pisces , " 63 01h 53.5m ' Aries 4 4.8, " 0 01h 57.9m ' Aries 4 4.9, " 46 02h 02.0m ' Pisces , : 2.0" 2000: 1.8" 2020: 1.7" 02h 03.9m ' Andromeda 4 2.3, " 63 02h 12.4m ' Triangulum 4 5.3, " 71 02h 31.8m ' Ursa Minor 1 2.0, " h 43.3m ' Cetus , " h 50.7m ' Perseus 1 3.8, " h 00.9m ' Perseus 1, 4 5.3, " Eridanus 03h 54.3m ' Eridanus 10, , " 347 Chi Taurus χ Tauri 04h 22.6m ' Taurus 5 5.5, " : : : : : : 257

2 Page 2 of 7 1 Camelopardalis 04h 32.0m ' Camelopardalis 1, 5 5.7, " Eridanus 04h 43.6m ' Eridanus , " 317 Beta Orion β Orionis (Rigel) 05h 14.5m ' Orion , " Taurus 05h 29.3m ' Taurus 5 5.8, " 204 Delta Orion (A-C) δ Orionis Struve 747 Σ747 Lamda Orion λ Orionis Theta 1 Orion θ¹ Orionis The Trapezium Iota Orion ι Orionis Theta 2 Orion θ² Orionis Sigma Orion (A-D) σ Orionis (A-E) Zeta Orion (A-B) ζ Orionis (A-C) Gamma Lepus γ Leporis Theta Auriga θ Aurigae Epsilon Monoceros ε Monocerotis 05h 32.0m ' Orion , " 359 white/ violet 05h 35.0m ' Orion , " h 35.1m ' Orion , " 43 05h 35.3m ' Orion 11 A (var.) B (var.) C 5.1 D 6.7 A-B: 8.8 A-C: 12.8 A-D: h 35.4m ' Orion , " h 35.4m ' Orion , " 92 05h 38.7m ' Orion , , h 40.8m ' Orion , , " 42.6" 2.4" 57.6" A-B: 31 A-C: 132 A-D: 96 05h 44.5m ' Lepus , " 350 yellow/ orange h 59.7m ' Auriga 5 2.6, " h 23.8m ' Monoceros 11, , " 27 yellow/ blue

3 Page 3 of 7 Beta Monoceros (A-B) β Monocerotis (B-C) 12 Lynx (A-B) (A-C) Epsilon Canis Major ε Canis Majoris Delta Gemini δ Geminorum 06h 28.8m ' Monoceros 11, , , h 46.2m ' Lynx 1 5.4, , " 2.8" 1.7" 8.7" h 58.6m ' Canis Major , " h 20.1m ' Gemini 5 3.5, : 6.1" 2000: 5.8" 2020: 5.4" 19 Lynx (A-B) 07h 22.9m ' Lynx 1,5 5.6, " 315 Alpha Gemini (A-B) α Geminorum (Castor) (A-C) Kappa Puppis κ Puppis Zeta Cancer (A-C) ζ Cancri Iota Cancer ι Cancri 07h 34.6m ' Gemini 5 1.9, , : 4.0" 2020: 5.6" 72.5" 07h 38.8m ' Puppis , " h 12.2m ' Cancer , : 6.1" 2000: h 46.7m ' Cancer 6 4.2, " Lynx 09h 18.8m ' Lynx 6 3.9, " 229 Alpha Leo (A-B) α Leonis (Regulus) Gamma Leo (A-B) γ Leonis 10h 08.4m ' Leo , " h 20.0m ' Leo 6, , : 4.3" 2000: Leo 10h 55.6m ' Leo 6 4.5, " 110 N Hydra 11h 32.3m ' Hydra , " 210 Delta Corvus δ Corvi 12h 29.9m ' Corvus , " Coma Berenices 12h 35.1m ' Coma Berenices , " : : : : : : : : : 125

4 Page 4 of 7 Gamma Virgo γ Virginis 12h 41.7m ' Virgo , : 1.8" 2010: 0.9" 32 Camelopardalis 12h 49.2m ' Camelopardalis 2 5.3, " 326 Alpha Canes Venatici α Canum Venaticorum (Cor Caroli) Zeta Ursa Major (Mizar AB) ζ Ursae Majoris (Alcor) Kappa Bootes κ Bootis Iota Bootes ι Bootis Pi Bootes π Bootis Epsilon Bootes (A-B) ε Bootis Alpha Libra α Librae Xi Bootes (A-B) ξ Bootis Delta Bootes δ Bootis Mu Bootes (A-B) µ Bootis (B-C) Delta Serpens δ Serpentis Zeta Corona Borealis ζ Coronae Borealis 12h 56.0m ' Canes Venatici 7 2.9, " h 23.9m ' Ursa Major 2 2.3, " 709" 2000: : h 13.5m ' Bootes 2, 7 4.6, " 236 sec. blue 14h 16.2m ' Bootes 2, 7 4.9, " 33 14h 40.7m ' Bootes 7, , " h 45.0m ' Bootes 7 2.5, " 339 yellow/ blue 14h 50.9m ' Libra , " 314 yellow/ blue-white 14h 51.4m ' Bootes 7, , : 7.0" 2000: 6.6" 2010: 6.0" 15h 15.5m ' Bootes 7 3.5, " 79 15h 24.5m ' Bootes 7 4.3, , " 2000: 2.3" 2020: 2.2" 1990: : : : : 2 15h 34.8m ' Serpens , " h 39.4m ' Corona Borealis 7 5.1, " 305 yellow/ red

5 Page 5 of 7 Xi Scorpius (A-C) ξ Scorpii Struve 1999 (A-B) Σ 1999 Beta Scorpius (A-C) β Scorpii Kappa Hercules (A-B) κ Herculis Nu Scorpius (A-C) ν Scorpii Sigma Corona Borealis σ Coronae Borealis 17 Draco (A-B) Draco 16h 04.4m ' Scorpius , " 51 16h 04.4m ' Scorpius , " 99 16h 05.4m ' Scorpius 15, , " 21 white/ blue 16h 08.1m ' Hercules , " 12 16h 12.0m ' Scorpius 15, , " h 14.7m ' Corona Borealis 7, 8 5.6, " h 36.2m ' Draco 3 5.4, " 90.3" Mu Draco (A-B) µ Draconis Alpha Hercules α Herculis Delta Hercules δ Herculis 17h 05.3m ' Draco 3 5.7, : 1.9" 2020: 2.2" 17h 14.6m ' Hercules , " h 15.0m ' Hercules 8 3.1, " : : Ophiuchus 17h 15.3m ' Ophiuchus , " 146 orange pair Omicron Ophiuchus ο Ophiuchi Rho Hercules (A-B) ρ Herculis Nu Draco ν Draconis Psi Draco (A-B) ψ Draconis 17h 18.0m ' Ophiuchus , " 355 yellow/ blue 17h 23.7m ' Hercules 8 4.6, " h 32.2m ' Draco 3 4.9, " h 41.9m ' Draco 3 4.9, " 15

6 Page 6 of 7 41 Draco (A-B) 18h 00.2m ' Draco 3 5.7, " Hercules 18h 01.5m ' Hercules 8 5.0, " Ophiuchus 18h 05.5m ' Ophiuchus 15, , : 1.5" 1995: 2.5" 2000: 3.8" 2005: 4.9" Epsilon Lyra (ε 1 -ε 2 ) ε Lyrae ε 1 (A-B) Double-Double ε 2 (C-D) Zeta Lyra (A-D) ζ Lyrae Beta Lyra (A-B) β Lyrae Struve 2404 Σ 2404 Otto Struve 525 (A-C) ΟΣ 525 Theta Serpens (A-B) θ Serpentis Beta Cygnus β Cygni 18h 44.3m ' Lyra 8 5.1, , , " 2.6" 2.3" 1990: : : : h 44.8m ' Lyra 8 4.3, " h 50.1m ' Lyra 8 3.4, " h 50.8m ' Aquila , " 183 yellow/ red 18h 54.9m ' Lyra 8 6.0, " 350 yellow/ blue 18h 56.2m ' Serpens , " h 30.7m ' Cygnus 8 3.1, " 54 yellow/ blue 57 Aquila 19h 54.6m ' Aquila , " Cygnus (A-C) (A-D) Alpha Capricornus (α 1 -α 2 ) α Capricorni (α 1 -AC) (α 2 -AB) Beta Capricornus (A-B) β Capricorni 20h 13.6m ' Cygnus 9 3.8, , h 17.6m 20h 18.1m ' ' Capricornus , , , " 337.5" 377.8" 45" 6.6" h 21.0m ' Capricornus , " 267

7 Page 7 of 7 Gamma Delphinus γ Delphini 20h 46.7m ' Delphinus , " Cygnus 21h 06.9m ' Cygnus 9 5.2, " 150 Beta Cepheus β Cephei Struve 2816 (A-C) Σ2816 (A-D) Epsilon Pegasus (A-C) ε Pegasi Xi Cepheus ξ Cephei Zeta Aquarius ζ Aquarii Delta Cepheus (A-C) δ Cephei 21h 28.7m ' Cepheus 3 3.2, " h 39.0m ' Cepheus 3 5.6, , " 19.9" h 44.2m ' Pegasus , " h 03.8m ' Cepheus 3 4.4, " h 28.8m ' Aquarius , : 2.0" 2000: 2.1" 2004: 2.2" 22h 29.2m ' Cepheus 3 A C Lacerta 22h 35.9m ' Lacerta 9 5.7, " Aquarius 23h 19.1m ' Aquarius , " 350 Sigma Cassiopeia (A-B) σ Cassiopeiae 23h 59.0m ' Cassiopeia 1,3 5.0, 7.1 3" : : : " 191 The A star is variable This table was put together to provide more accurate values for the data in the Astronomical League s Double Star list. In completing the program, we found that the list as published on the A.L. Website had several instances of outdated or incomplete data. For example, several of the double stars orbit fast enough that the position angle and/or separation change over time intervals of ten, five, or as little as one year, but the published list only had one set of values. To address that problem, we listed values for a number of years. Our primary reference for this data was Sky Catalogue , Volume 2: Double Stars, Variable Stars, and Nonstellar Objects, edited by Alan Hirshfeld and Roger W. Sinnott, Sky Publishing Co Edwin T. Lurcott James J. Anderson A.L. Double Star Certificate #50 A.L. Double Star Certificate #97 Observing Chair, past President, and Founder ALCor and Newsletter Editor Chester County Astronomical Society Chester County Astronomical Society

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