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HD 74438
HD 74438 is a spectroscopic quadruple stellar system composed of a pair of double star systems approximately 425 light years from Earth, located in the open cluster IC 2391. With an estimated age of 43+15−7 million years, HD 74438 is the youngest quadruple star system known. The outer orbital period of the system, estimated at around 5.7 years, is also among the shortest of quadruple systems.
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