The designations ρ1 and ρ2 are rarely seen. The two stars are only separated by four arc-seconds and cannot be separated by the naked eye and are more commonly referred to as ρ Herculis A and B. They both have the same Flamsteed designation 75 Herculis, Hipparcos catalogue number 85112, and Bonner Durchmusterung designation BD+37°2878, but different HR and HD numbers.
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