| 31. | Is a binary system with an orbital period of hours.
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| 32. | Its asteroid moon has an orbital period of 31.6 hours.
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| 33. | Hence velocities are the same and orbital periods are halved.
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| 34. | 19521 Chaos has an orbital period of approximately 309 years.
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| 35. | Both stars rotate faster than their mutual orbital period.
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| 36. | The orbital period of the system is accurately known.
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| 37. | Their orbital period is a minimum of 124 years.
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| 38. | The asteroid has an orbital period of 3.77 years.
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| 39. | The binary has an orbital period of 8.48 years.
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| 40. | The orbital period of this binary is 101.5 years.
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