| 31. | Nu Sagittarii is often cited as one of the earliest identified double stars.
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| 32. | By 1893 Russell had discovered 500 new double stars.
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| 33. | Double star catalogues list several companions for 19 Cephei.
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| 34. | His activities included the study of double stars, minor planets and comets.
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| 35. | The Dawes resolution limit is more often used in visual double star astronomy.
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| 36. | ? 1 Fornacis has three companions listed in the Washington Double Star Catalog.
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| 37. | First we saw double stars with our binoculars.
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| 38. | There are several fine double stars in Serpens.
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| 39. | There are several interesting double stars in Pisces.
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| 40. | ? Aquarii is an F2 spectral type double star; both stars are white.
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